The Heyuan Fault,is one of the main NE-trending faults in the southernmost South China Block and is close to the northernmost South China Sea to the south.The fault features multi-stage deformation and controlled the ...The Heyuan Fault,is one of the main NE-trending faults in the southernmost South China Block and is close to the northernmost South China Sea to the south.The fault features multi-stage deformation and controlled the formation of late Cretaceous to Cenozoic basins.Based on detailed field investigations and comprehensive geochronological research,including zircon U-Pb,Rb-Sr isochron,zircon U-Th-He dating,two episodic tectono-thermal events are recognized.The first occurred during~79 Ma to 66 Ma,which is characterized by large-scale quartz-fluid emplacement.The other occurred at~34 Ma,which features the eruption of a set of basalts.The two events show a changing on material source from siliceous hydrotherm to basalt magma,supporting obvious lithospheric thinning of the southernmost South China Block,which shed light on the geological evolution and the interaction mechanisms between the SCB and the northern South China Sea since the Late Cretaceous.展开更多
The Late Mesozoic tectono-thermal evolution and geodynamic setting of the Great Xing’an Range(GXR),particularly in the south margin,are still ambiguous.In this study,we present original low-temperature thermochronolo...The Late Mesozoic tectono-thermal evolution and geodynamic setting of the Great Xing’an Range(GXR),particularly in the south margin,are still ambiguous.In this study,we present original low-temperature thermochronological data of six granitoid samples collected from Maanzi pluton in the south margin of the GXR.The apatite and zircon(U-Th)/He ages vary of 70.8 ± 4.3-119.0 ±7.0 Ma and 120.0 ± 7.1-146.7 ± 8.7 Ma,respectively.Further numerical inverse modeling results reveal that the granitoid plutons experienced a rapid cooling and exhumation stage during Early Cretaceous with a rate of ~5.0-6.0 ℃/Ma and ~0.14-0.17 mm/yr,respectively,including the western minor pluton emplaced during Early Permian and the major pluton crystallized in latest Jurassic,corresponding to the extensional tectonics in NE China.The rapid exhumation processes in the south margin of the GXR during the Early Cretaceous could be related to both the rollback of Paleo-Pacific oceanic plate and the collapse of thickened crust in the Mongol-Okhotsk Orogen.展开更多
This work restored the erosion thickness of the top surface of each Cretaceous formations penetrated by the typical well in the Hari sag,and simulated the subsidence burial history of this well with software BasinMod....This work restored the erosion thickness of the top surface of each Cretaceous formations penetrated by the typical well in the Hari sag,and simulated the subsidence burial history of this well with software BasinMod.It is firstly pointed out that the tectonic subsidence evolution of the Hari sag since the Cretaceous can be divided into four phases:initial subsidence phase,rapid subsidence phase,uplift and erosion phase,and stable slow subsidence phase.A detailed reconstruction of the tectonothermal evolution and hydrocarbon generation histories of typical well was undertaken using the EASY R%model,which is constrained by vitrinite reflectance(R)and homogenization temperatures of fluid inclusions.In the rapid subsidence phase,the peak period of hydrocarbon generation was reached at c.a.105.59 Ma with the increasing thermal evolution degree.A concomitant rapid increase in paleotemperatures occurred and reached a maximum geothermal gradient of about 43-45℃/km.The main hydrocarbon generation period ensued around 105.59-80.00 Ma and the greatest buried depth of the Hari sag was reached at c.a.80.00 Ma,when the maximum paleo-temperature was over 180℃.Subsequently,the sag entered an uplift and erosion phase followed by a stable slow subsidence phase during which the temperature gradient,thermal evolution,and hydrocarbon generation decreased gradually.The hydrocarbon accumulation period was discussed based on homogenization temperatures of inclusions and it is believed that two periods of rapid hydrocarbon accumulation events occurred during the Cretaceous rapid subsidence phase.The first accumulation period observed in the Bayingebi Formation(Kb)occurred primarily around 105.59-103.50 Ma with temperatures of 125-150℃.The second accumulation period observed in the Suhongtu Formation(Ks)occurred primarily around84.00-80.00 Ma with temperatures of 120-130℃.The second is the major accumulation period,and the accumulation mainly occurred in the Late Cretaceous.The hydrocarbon accumulation process was comprehensively controlled by tectono-thermal evolution and hydrocarbon generation history.During the rapid subsidence phase,the paleo temperature and geothermal gradient increased rapidly and resulted in increasing thermal evolution extending into the peak period of hydrocarbon generation,which is the key reason for hydrocarbon filling and accumulation.展开更多
The Liwan Sag,with an area of 4000 km-2,is one of the deepwater sags in the Zhujiang River(Pearl River)Mouth Basin,northern South China Sea.Inspired by the exploration success in oil and gas resources in the deepwater...The Liwan Sag,with an area of 4000 km-2,is one of the deepwater sags in the Zhujiang River(Pearl River)Mouth Basin,northern South China Sea.Inspired by the exploration success in oil and gas resources in the deepwater sags worldwide,we conducted the thermal modeling to investigate the tectono-thermal history of the Liwan Sag,which has been widely thought to be important to understand tectonic activities as well as hydrocarbon potential of a basin.Using the multi-stage finite stretching model,the tectonic subsidence history and the thermal history have been obtained for 12 artificial wells,which were constructed on basis of one seismic profile newly acquired in the study area.Two stages of rifting during the time periods of 49–33.9 Ma and 33.9–23 Ma can be recognized from the tectonic subsidence pattern,and there are two phases of heating processes corresponding to the rifting.The reconstructed average basal paleo-heat flow values at the end of the rifting events are-70.5 and-94.2 mW/m^2 respectively.Following the heating periods,the study area has undergone a persistent thermal attenuation phase since 23 Ma and the basal heat flow cooled down to-71.8–82.5 mW/m^2 at present.展开更多
The Qaidam basin is the largest intermountain basin inside Tibet, and is one of the three major petroliferous basins in western China. This study discussed the geothermal field and tectono-thermal evolution of the bas...The Qaidam basin is the largest intermountain basin inside Tibet, and is one of the three major petroliferous basins in western China. This study discussed the geothermal field and tectono-thermal evolution of the basin, in an effort to provide evidence for intracontinental or intraplate continental dynamics and basin dynamics, petroleum resources assessment, and to serve petroleum production.展开更多
The southern Ordos Basin has excellent petroleum exploration prospects.However,the tectono-thermal history and the controls on petroleum generation,accumulation and preservation conditions in southern basin are unclea...The southern Ordos Basin has excellent petroleum exploration prospects.However,the tectono-thermal history and the controls on petroleum generation,accumulation and preservation conditions in southern basin are unclear.In this study,we analyzed the present geothermal field,paleo-geothermal gradient,maturity of the hydrocarbon source rocks,uplift and cooling process and tectono-thermal evolution history.In the study area,for the Ordovician,Permain and the Triassic strata,the present temperature is low(3070℃)in the southeastern area but high(80140℃)in the northwestern area.The paleogeothermal gradient varied from 24℃/km to 30℃/km with a heat flow of 58—69 m W/m^(2)(i.e.,a medium-temperature basin).The paleo-temperatures are higher than the present temperatures and the maximum paleo-temperatures controlled the thermal maturity of the source rocks.The vitrinite reflectance(Ro)values of the Triassic strata are>0.7%and the thermal maturity reached the middlemature oil generation stage.The Rovalues of the Permian-Ordovician strata are>1.8%and the thermal maturity reached the over-mature gas generation stage.The southern Ordos Basin has experienced the multiple tectonic events at the Late Ordovician Caledonian(452 Ma),Late Triassic(215 Ma),Late Jurassic(165160 Ma),End-Early Cretaceous(110100 Ma)and Cenozoic(since 40 Ma).A large-scale tectonothermal event occurred at the End-Early Cretaceous(110100 Ma),which was controlled by lithospheric extension,destruction and thinning.This event led to the highest paleo-temperatures and thermal maturities and coeval with the peak period of petroleum generation and accumulation.The southern Ordos Basin has undergone rapid and large-scale uplift since the Late Cretaceous due to expansion of the northeastern margin of the Tibetan Plateau,uplift of the Qinling orogenic belt and thrust faulting in the Liupanshan tectonic belt.The southern Ordos Basin experienced tectonic overprinting that was strong in the south and weak in the north.The strongest overprinting occurred in the southwestern part of the basin.The large-scale uplift,denudation and faulting led to oil and gas loss from reservoirs.The petroleum generation,accumulation and preservation in the southern Ordos Basin were affected by deep lithospheric structures and the tectono-thermal evolution.This work provides a novel tectono-thermal perspective on the petroleum generation,accumulation and preservation condition of the southern Ordos Basin.展开更多
Some 1.95 Ga metamorphism of high-grade Ar-chean rocks in Kongling terrain, continental nucleus of Yangtze Block, South China, are recognized by Sm-Nd dating. This event is further confirmed by the ages of single zirc...Some 1.95 Ga metamorphism of high-grade Ar-chean rocks in Kongling terrain, continental nucleus of Yangtze Block, South China, are recognized by Sm-Nd dating. This event is further confirmed by the ages of single zircon SHRIMP U-Pb and K-Ar analyses of TTG and (or) paragneisses, and intrusions of potassic-granitic batholith in the region. The coincidence in period between the high-grade metamorphism in the Kongling area and the creation of major basement rocks of its neighborhoods of the Yangtze Block around the Kongling Archean nucleus makes it a favorable explanation for their tectonic connections that, in the whole Yangtze Block there was some tectono-thermal event of ca. 2.0-1.8 Ga, which resulted in the formation of unitive Yangtze basement.展开更多
The geothermal history and the tectonic subsidence history of the Huaibei-Huainan coalfields were reconstructed by using the vitrinite reflectance data, and their correlative restriction on coalbed gas generation of H...The geothermal history and the tectonic subsidence history of the Huaibei-Huainan coalfields were reconstructed by using the vitrinite reflectance data, and their correlative restriction on coalbed gas generation of Huaibei-Huainan coalfields and Qinshui coal basin was discussed. The burial, thermal, and maturity histories of are similar between Huaibei coalfield and Huainan coalfield, obviously different from those of Qinshui coal basin. Based on the tectono-thermal evolution characters of Huaibei-Huainan coalfields and Qinshui basin, the process of coalbed gas generation can be divided into three stages： （1） Dur- ing Early Mesozoic, both in Huaibei-Huainan and Qinshui, the buried depth of Permian coal seams increased rapidly, which resulted in strong metamorphism and high burial temperature of coal seams. At this stage, the coal rank was mainly fat coal, and locally reached coking coal. These created an environment favoring the generation of thermogenic gas. （2） From Late Ju- rassic to Cretaceous, in the areas of Huaibei-Hualnan, the strata suffered from erosion and the crust became thinning, and the Permian coal-bearing strata were uplifted to surface. At this stage, the thermogenic gas mostly escaped. Conversely, in Qinshui basin, the cover strata of coal seams kept intact during this stage, and the thermogenic gas were mostly preserved. Furthermore, with the interaction of magmatism, the burial temperature of coal seams reached higher peak value, and it was suitable for the secondary generation of thermogenic gas. （3） From Paleogene onward, in area of Huainan-Huaibei, the maturity of coal and burial temperature were propitious to the generation of secondary biogenic gases. However, in Qinshui basin, the maturity of coal went against genesis of second biogenic gas or thermogenic gas. By comparison, Huaibei-Huainan coalfields are dominated by thermogenic gas with a significant biogenic gas and hydrodynamic overprint, whereas Qinshui basin is dominated mainly by thermogenic gas.展开更多
Based on the observed data, the average value of surface heatflow in the Yinggehai Basin is calculated and it turns out to be 84.1 mW/m2. The thermal evolution of the basin since the Cenozoic era has been attempted by...Based on the observed data, the average value of surface heatflow in the Yinggehai Basin is calculated and it turns out to be 84.1 mW/m2. The thermal evolution of the basin since the Cenozoic era has been attempted by tectono-thermal modeling. Three-phase extension made the basin become hotter and hotter, reaching its climax in paleo-temperature history since 5.2 Ma. And nowadays, the basin is in the heat flow decreasing period. During the Cenozoic era, the basement heat flow remained at 50-70 mW/m2 all the time. This is related to the degree of each extension phase, stretching rate mode and also the limited basin scale. Modeling results also show that, the surface heat flow is controlled mainly by the basement heat flow, and less than 20% comes from radiogenic heat production in the sediments of the basin.展开更多
Ⅰ. IMPLICATIONS OF THE INTEGRATED STUDY OF THE TECTONO-THERMAL EVOLUTIONRef. [1] reported 13 heat flow values along the profile from Yadong to the Qaidam Basin for the first time. After further systematic analysis an...Ⅰ. IMPLICATIONS OF THE INTEGRATED STUDY OF THE TECTONO-THERMAL EVOLUTIONRef. [1] reported 13 heat flow values along the profile from Yadong to the Qaidam Basin for the first time. After further systematic analysis and verification, these data together with the latitudes and longitudes of the heat flow sites, depth interval of linear sections, tem-展开更多
The tectonic settings of the different stages of the magmatic activity in the middle-south section of the Da Hinggan Mts. are analyzed through measuring the isotopic ages of the Mesozoic volcano-plutonic rocks from th...The tectonic settings of the different stages of the magmatic activity in the middle-south section of the Da Hinggan Mts. are analyzed through measuring the isotopic ages of the Mesozoic volcano-plutonic rocks from this area, and thus the tectono-magmatic evolution series are consequently determined as the initial mantle upwelling marked by the Late Triassic invasion of basic-ultrabasic rocks containing mantle-source enclaves, middle-upper crust extension marked by intrusion of the Early-Middle Jurassic diobase dike swarms, dramatic ruption of the Late Jurassic trachitic volcanic rocks, the Early Cretaceous nonorogenic alkalic-subalkalic granite invasion and the formation of the basic dike swarms and basalts. It is thus inferred that the uprise of the Da Hinggan Mts. in the Mesozoic is closely reiated to the upwelling of the deep magma in the mantle upwarping settings.展开更多
Apatite(U-Th)/He and fission track dating and tectono-thermal history modeling were used to reconstruct the Meso-Cenozoic tectonic evolution of the Huangling paleo-uplift in the Middle Yangtze Block,South China.The te...Apatite(U-Th)/He and fission track dating and tectono-thermal history modeling were used to reconstruct the Meso-Cenozoic tectonic evolution of the Huangling paleo-uplift in the Middle Yangtze Block,South China.The tectono-thermal evolution showed different tectonic exhumation/subsidence processes in the tectonic evolution of the foreland basin.The apatite(U-Th)/He ages ranged from 31.3 to 77.8 Ma,recording the thermal events of the Cenozoic Himalayan movement and indicating progressive exhumation extending from the southeast to the northwest.The thermal information of the Mesozoic Yanshan movement period was recorded by the apatite fission track age with a pooled age of 93.8 to 147 Ma.The exhumation of the Huangling paleo-uplift began in the Late Jurassic.The tectono-thermal evolution was characterized by a rapid uplift during 140-115 Ma,subsidence during 115-60 Ma,a rapid uplift during 40-30 Ma,and a slow uplift from 30 Ma to the present.The western Hunan-Hubei Depression was exhumed in the Middle Jurassic,and the tectono-thermal evolution was characterized by a rapid uplift during 160-135 Ma,a slow uplift during 135-50 Ma,a rapid uplift during 50-25 Ma,and a slow uplift from 25 Ma to the present.This Cenozoic exhumation was a response to the far field effect of the eastward growth of the Tibetan Plateau.The Cretaceous basins exposed in the surrounding areas of the Huangling paleo-uplift(Zigui basin,Yichang slope,and Huaguoping synclinorium)are foreland basins formed by the bi-directional compression of the Qinling-Dabie orogenic belt and the Xuefengshan intracontinental deformation system.展开更多
基金jointly supported by projects,including the Study on the Lithospheric Thermal Structure,the Formation Mechanism of Geothermal Systems,and the Assessment of Geothermal Resources of the Guangdong-Hong Kong-Macao Greater Bay Area(Grant No.U20A2096)The Huizhou Multi-factors Urban Geological Survey Project(Grant No.DD20190287)the Update and Sharing of China Geological Maps of Land and Sea areas(Grant No.DD20190370)。
文摘The Heyuan Fault,is one of the main NE-trending faults in the southernmost South China Block and is close to the northernmost South China Sea to the south.The fault features multi-stage deformation and controlled the formation of late Cretaceous to Cenozoic basins.Based on detailed field investigations and comprehensive geochronological research,including zircon U-Pb,Rb-Sr isochron,zircon U-Th-He dating,two episodic tectono-thermal events are recognized.The first occurred during~79 Ma to 66 Ma,which is characterized by large-scale quartz-fluid emplacement.The other occurred at~34 Ma,which features the eruption of a set of basalts.The two events show a changing on material source from siliceous hydrotherm to basalt magma,supporting obvious lithospheric thinning of the southernmost South China Block,which shed light on the geological evolution and the interaction mechanisms between the SCB and the northern South China Sea since the Late Cretaceous.
基金supported by the National Natural Science Foundation of China(Nos.42002168,42127801,41688103,41773046)the China Geology Survey(Nos.DD20190001,DD20190004)the China Postdoctoral Science Foundation(No.2020M670400)。
文摘The Late Mesozoic tectono-thermal evolution and geodynamic setting of the Great Xing’an Range(GXR),particularly in the south margin,are still ambiguous.In this study,we present original low-temperature thermochronological data of six granitoid samples collected from Maanzi pluton in the south margin of the GXR.The apatite and zircon(U-Th)/He ages vary of 70.8 ± 4.3-119.0 ±7.0 Ma and 120.0 ± 7.1-146.7 ± 8.7 Ma,respectively.Further numerical inverse modeling results reveal that the granitoid plutons experienced a rapid cooling and exhumation stage during Early Cretaceous with a rate of ~5.0-6.0 ℃/Ma and ~0.14-0.17 mm/yr,respectively,including the western minor pluton emplaced during Early Permian and the major pluton crystallized in latest Jurassic,corresponding to the extensional tectonics in NE China.The rapid exhumation processes in the south margin of the GXR during the Early Cretaceous could be related to both the rollback of Paleo-Pacific oceanic plate and the collapse of thickened crust in the Mongol-Okhotsk Orogen.
基金supported by the project of"Constraints on Lithospheric Dynamic Evolution and Hydrocarbon Accumulation from Late Mesozoic Paleo-geothermal Field in Ordos and Qinshui Basins"(grant No.41630312)the National Nature Science Foundation of China(grants No.41372208 and 40534019)+1 种基金the Open Found of the State Key Laboratory of Ore Deposit Geochemistry,CAS(grant No.201304)supported by international program for Ph.D.candidates,Sun Yat-Sen University
文摘This work restored the erosion thickness of the top surface of each Cretaceous formations penetrated by the typical well in the Hari sag,and simulated the subsidence burial history of this well with software BasinMod.It is firstly pointed out that the tectonic subsidence evolution of the Hari sag since the Cretaceous can be divided into four phases:initial subsidence phase,rapid subsidence phase,uplift and erosion phase,and stable slow subsidence phase.A detailed reconstruction of the tectonothermal evolution and hydrocarbon generation histories of typical well was undertaken using the EASY R%model,which is constrained by vitrinite reflectance(R)and homogenization temperatures of fluid inclusions.In the rapid subsidence phase,the peak period of hydrocarbon generation was reached at c.a.105.59 Ma with the increasing thermal evolution degree.A concomitant rapid increase in paleotemperatures occurred and reached a maximum geothermal gradient of about 43-45℃/km.The main hydrocarbon generation period ensued around 105.59-80.00 Ma and the greatest buried depth of the Hari sag was reached at c.a.80.00 Ma,when the maximum paleo-temperature was over 180℃.Subsequently,the sag entered an uplift and erosion phase followed by a stable slow subsidence phase during which the temperature gradient,thermal evolution,and hydrocarbon generation decreased gradually.The hydrocarbon accumulation period was discussed based on homogenization temperatures of inclusions and it is believed that two periods of rapid hydrocarbon accumulation events occurred during the Cretaceous rapid subsidence phase.The first accumulation period observed in the Bayingebi Formation(Kb)occurred primarily around 105.59-103.50 Ma with temperatures of 125-150℃.The second accumulation period observed in the Suhongtu Formation(Ks)occurred primarily around84.00-80.00 Ma with temperatures of 120-130℃.The second is the major accumulation period,and the accumulation mainly occurred in the Late Cretaceous.The hydrocarbon accumulation process was comprehensively controlled by tectono-thermal evolution and hydrocarbon generation history.During the rapid subsidence phase,the paleo temperature and geothermal gradient increased rapidly and resulted in increasing thermal evolution extending into the peak period of hydrocarbon generation,which is the key reason for hydrocarbon filling and accumulation.
基金The Program of the Key Technologies for Petroleum Exploration in Deep Oceanic Areas under contract No.2011ZX05025-006-05the Chinese Postdoc Fund,No.58 General Fund,2015 under contract No.2015M582636the National Natural Science Foundation of China under contract No.41602251
文摘The Liwan Sag,with an area of 4000 km-2,is one of the deepwater sags in the Zhujiang River(Pearl River)Mouth Basin,northern South China Sea.Inspired by the exploration success in oil and gas resources in the deepwater sags worldwide,we conducted the thermal modeling to investigate the tectono-thermal history of the Liwan Sag,which has been widely thought to be important to understand tectonic activities as well as hydrocarbon potential of a basin.Using the multi-stage finite stretching model,the tectonic subsidence history and the thermal history have been obtained for 12 artificial wells,which were constructed on basis of one seismic profile newly acquired in the study area.Two stages of rifting during the time periods of 49–33.9 Ma and 33.9–23 Ma can be recognized from the tectonic subsidence pattern,and there are two phases of heating processes corresponding to the rifting.The reconstructed average basal paleo-heat flow values at the end of the rifting events are-70.5 and-94.2 mW/m^2 respectively.Following the heating periods,the study area has undergone a persistent thermal attenuation phase since 23 Ma and the basal heat flow cooled down to-71.8–82.5 mW/m^2 at present.
基金financially supported by National Natural Science Fund of China (grant no.41302202)Basic Scientific Research Project of Institute of Geological Mechanics (no.DZLXJK201305)
文摘The Qaidam basin is the largest intermountain basin inside Tibet, and is one of the three major petroliferous basins in western China. This study discussed the geothermal field and tectono-thermal evolution of the basin, in an effort to provide evidence for intracontinental or intraplate continental dynamics and basin dynamics, petroleum resources assessment, and to serve petroleum production.
基金supported by the National Natural Science Foundation of China(Grant Nos.42102164,42241204,41630312and 42272174)the Petro China Changqing Oilfield Company Science and Technology Major Project(ZDZX 2021-01)。
文摘The southern Ordos Basin has excellent petroleum exploration prospects.However,the tectono-thermal history and the controls on petroleum generation,accumulation and preservation conditions in southern basin are unclear.In this study,we analyzed the present geothermal field,paleo-geothermal gradient,maturity of the hydrocarbon source rocks,uplift and cooling process and tectono-thermal evolution history.In the study area,for the Ordovician,Permain and the Triassic strata,the present temperature is low(3070℃)in the southeastern area but high(80140℃)in the northwestern area.The paleogeothermal gradient varied from 24℃/km to 30℃/km with a heat flow of 58—69 m W/m^(2)(i.e.,a medium-temperature basin).The paleo-temperatures are higher than the present temperatures and the maximum paleo-temperatures controlled the thermal maturity of the source rocks.The vitrinite reflectance(Ro)values of the Triassic strata are>0.7%and the thermal maturity reached the middlemature oil generation stage.The Rovalues of the Permian-Ordovician strata are>1.8%and the thermal maturity reached the over-mature gas generation stage.The southern Ordos Basin has experienced the multiple tectonic events at the Late Ordovician Caledonian(452 Ma),Late Triassic(215 Ma),Late Jurassic(165160 Ma),End-Early Cretaceous(110100 Ma)and Cenozoic(since 40 Ma).A large-scale tectonothermal event occurred at the End-Early Cretaceous(110100 Ma),which was controlled by lithospheric extension,destruction and thinning.This event led to the highest paleo-temperatures and thermal maturities and coeval with the peak period of petroleum generation and accumulation.The southern Ordos Basin has undergone rapid and large-scale uplift since the Late Cretaceous due to expansion of the northeastern margin of the Tibetan Plateau,uplift of the Qinling orogenic belt and thrust faulting in the Liupanshan tectonic belt.The southern Ordos Basin experienced tectonic overprinting that was strong in the south and weak in the north.The strongest overprinting occurred in the southwestern part of the basin.The large-scale uplift,denudation and faulting led to oil and gas loss from reservoirs.The petroleum generation,accumulation and preservation in the southern Ordos Basin were affected by deep lithospheric structures and the tectono-thermal evolution.This work provides a novel tectono-thermal perspective on the petroleum generation,accumulation and preservation condition of the southern Ordos Basin.
基金the National Natural Science Foundation of China (Grant Nos. 49603044, 49625305, 49873010 and 49794043) the Project of the Open Laboratory of Consitution, Interaction and Dynamics of Crust-Mantle System, the Ministry of Land and Resources of China.
文摘Some 1.95 Ga metamorphism of high-grade Ar-chean rocks in Kongling terrain, continental nucleus of Yangtze Block, South China, are recognized by Sm-Nd dating. This event is further confirmed by the ages of single zircon SHRIMP U-Pb and K-Ar analyses of TTG and (or) paragneisses, and intrusions of potassic-granitic batholith in the region. The coincidence in period between the high-grade metamorphism in the Kongling area and the creation of major basement rocks of its neighborhoods of the Yangtze Block around the Kongling Archean nucleus makes it a favorable explanation for their tectonic connections that, in the whole Yangtze Block there was some tectono-thermal event of ca. 2.0-1.8 Ga, which resulted in the formation of unitive Yangtze basement.
基金supported by National Natural Science Foundation of China (Grant Nos. 41030422, 40772135, 40972131, 40940014)National Basic Research Program of China (Grant No. 2009CB219601)
文摘The geothermal history and the tectonic subsidence history of the Huaibei-Huainan coalfields were reconstructed by using the vitrinite reflectance data, and their correlative restriction on coalbed gas generation of Huaibei-Huainan coalfields and Qinshui coal basin was discussed. The burial, thermal, and maturity histories of are similar between Huaibei coalfield and Huainan coalfield, obviously different from those of Qinshui coal basin. Based on the tectono-thermal evolution characters of Huaibei-Huainan coalfields and Qinshui basin, the process of coalbed gas generation can be divided into three stages： （1） Dur- ing Early Mesozoic, both in Huaibei-Huainan and Qinshui, the buried depth of Permian coal seams increased rapidly, which resulted in strong metamorphism and high burial temperature of coal seams. At this stage, the coal rank was mainly fat coal, and locally reached coking coal. These created an environment favoring the generation of thermogenic gas. （2） From Late Ju- rassic to Cretaceous, in the areas of Huaibei-Hualnan, the strata suffered from erosion and the crust became thinning, and the Permian coal-bearing strata were uplifted to surface. At this stage, the thermogenic gas mostly escaped. Conversely, in Qinshui basin, the cover strata of coal seams kept intact during this stage, and the thermogenic gas were mostly preserved. Furthermore, with the interaction of magmatism, the burial temperature of coal seams reached higher peak value, and it was suitable for the secondary generation of thermogenic gas. （3） From Paleogene onward, in area of Huainan-Huaibei, the maturity of coal and burial temperature were propitious to the generation of secondary biogenic gases. However, in Qinshui basin, the maturity of coal went against genesis of second biogenic gas or thermogenic gas. By comparison, Huaibei-Huainan coalfields are dominated by thermogenic gas with a significant biogenic gas and hydrodynamic overprint, whereas Qinshui basin is dominated mainly by thermogenic gas.
基金the National Natural Science Foundation of China (Grant Nos. 49732005 49804004) and Key-Project (KZ951-A1-401) of Chinese Academy of Sciences.
文摘Based on the observed data, the average value of surface heatflow in the Yinggehai Basin is calculated and it turns out to be 84.1 mW/m2. The thermal evolution of the basin since the Cenozoic era has been attempted by tectono-thermal modeling. Three-phase extension made the basin become hotter and hotter, reaching its climax in paleo-temperature history since 5.2 Ma. And nowadays, the basin is in the heat flow decreasing period. During the Cenozoic era, the basement heat flow remained at 50-70 mW/m2 all the time. This is related to the degree of each extension phase, stretching rate mode and also the limited basin scale. Modeling results also show that, the surface heat flow is controlled mainly by the basement heat flow, and less than 20% comes from radiogenic heat production in the sediments of the basin.
基金Project supported by the National Natural Science Foundation of China.
文摘Ⅰ. IMPLICATIONS OF THE INTEGRATED STUDY OF THE TECTONO-THERMAL EVOLUTIONRef. [1] reported 13 heat flow values along the profile from Yadong to the Qaidam Basin for the first time. After further systematic analysis and verification, these data together with the latitudes and longitudes of the heat flow sites, depth interval of linear sections, tem-
文摘The tectonic settings of the different stages of the magmatic activity in the middle-south section of the Da Hinggan Mts. are analyzed through measuring the isotopic ages of the Mesozoic volcano-plutonic rocks from this area, and thus the tectono-magmatic evolution series are consequently determined as the initial mantle upwelling marked by the Late Triassic invasion of basic-ultrabasic rocks containing mantle-source enclaves, middle-upper crust extension marked by intrusion of the Early-Middle Jurassic diobase dike swarms, dramatic ruption of the Late Jurassic trachitic volcanic rocks, the Early Cretaceous nonorogenic alkalic-subalkalic granite invasion and the formation of the basic dike swarms and basalts. It is thus inferred that the uprise of the Da Hinggan Mts. in the Mesozoic is closely reiated to the upwelling of the deep magma in the mantle upwarping settings.
基金funded by the National Natural Science Foundation of China(U2244208,42302138)China Postdoctoral Science Foundation(No.2020M733869)Science Foundation of China University of Petroleum,Beijing(No.2462023XKBH003).
文摘Apatite(U-Th)/He and fission track dating and tectono-thermal history modeling were used to reconstruct the Meso-Cenozoic tectonic evolution of the Huangling paleo-uplift in the Middle Yangtze Block,South China.The tectono-thermal evolution showed different tectonic exhumation/subsidence processes in the tectonic evolution of the foreland basin.The apatite(U-Th)/He ages ranged from 31.3 to 77.8 Ma,recording the thermal events of the Cenozoic Himalayan movement and indicating progressive exhumation extending from the southeast to the northwest.The thermal information of the Mesozoic Yanshan movement period was recorded by the apatite fission track age with a pooled age of 93.8 to 147 Ma.The exhumation of the Huangling paleo-uplift began in the Late Jurassic.The tectono-thermal evolution was characterized by a rapid uplift during 140-115 Ma,subsidence during 115-60 Ma,a rapid uplift during 40-30 Ma,and a slow uplift from 30 Ma to the present.The western Hunan-Hubei Depression was exhumed in the Middle Jurassic,and the tectono-thermal evolution was characterized by a rapid uplift during 160-135 Ma,a slow uplift during 135-50 Ma,a rapid uplift during 50-25 Ma,and a slow uplift from 25 Ma to the present.This Cenozoic exhumation was a response to the far field effect of the eastward growth of the Tibetan Plateau.The Cretaceous basins exposed in the surrounding areas of the Huangling paleo-uplift(Zigui basin,Yichang slope,and Huaguoping synclinorium)are foreland basins formed by the bi-directional compression of the Qinling-Dabie orogenic belt and the Xuefengshan intracontinental deformation system.
