Abstract: The Tongkuangyu metaporphyry copper deposit formed in the Early Proterozoic is tectonically located in the northern part of the Zhongtiao Λ-type palaeorift depression, on the southern margin of the North Ch...Abstract: The Tongkuangyu metaporphyry copper deposit formed in the Early Proterozoic is tectonically located in the northern part of the Zhongtiao Λ-type palaeorift depression, on the southern margin of the North China platform. The genesis of the deposit has long been a hot subject of research of geologists working on mineral deposits. By means of the protolith reconstruction and fluid inclusion and isotope studies of host rocks of the deposits, the authors hold that this deposit is the product of combined exogenic, endogenic and metamorphic processes. Its formation mainly involved the following four stages: (1) the stage of formation of Mg- and Fe-rich tuffaceous variegated cupriferous sand-shale and K-rich biomodal volcanic rocks; (2) the early stage of formation of the metaporphyry copper deposit; (3) the stage of formation of the metaporphyry copper deposit; and (4) the stage of reworking of the metaporphyry copper deposit.展开更多
Polygenetic compound ore deposits are here defined as those ore deposits which evidently possess n1any sided genetic characteristics as a comprehensive result of more than one rnineralization stages, from many rnateri...Polygenetic compound ore deposits are here defined as those ore deposits which evidently possess n1any sided genetic characteristics as a comprehensive result of more than one rnineralization stages, from many rnaterial sources, and of many genetic types. They are formed most commonly during the diwa (geo(lepression) stage in the process of crustal evolution and, therefore, spread most widely in diwa regions. At the present stage of our knowledge, they may be subdivided into three principal models and many types of metallogenesis, controlled by different geotectonic conditions and being distributed in time and in space according to the corresponding regularities. This is a newly rccognizcd, third gcnetic type of ore deposits, being not reasonable to be simply referred to either pure endogenic or pure exogenic origin. They are very important and are of great study significance, becausc they comrnonly are rich and have a large amount of reserve with high economic value.展开更多
The metallogenic theory of polygenetic compound ore deposit is the important basis for location prediction of hidden ore deposits in diwa regions. It can play an important role in each step of prediction research, tar...The metallogenic theory of polygenetic compound ore deposit is the important basis for location prediction of hidden ore deposits in diwa regions. It can play an important role in each step of prediction research, targeting procedure, acquiring information and integrating information. In this paper, the authors discusses how to construct geological concept by using of the metallogenic theory of polygenetic ore deposits for predicting targeting area, to arrange investigation and detection for getting enough useful information, and to analyze and integrate information for reaching a trustful prediction conclusion. According to these strategies, we conduct a successful prediction of location of hidden ore bodies in the outer of the Fenghuangshan copper mine, a principal producing mine in Tongling Cu Au district.展开更多
Most giant porphyry-skarn Cu-Au ore systems are associated with either the metasomatic mantle wedge,formed by the dehydration of subducting oceanic crust,or the melting of Cu-rich juvenile lower crust.The ore-forming ...Most giant porphyry-skarn Cu-Au ore systems are associated with either the metasomatic mantle wedge,formed by the dehydration of subducting oceanic crust,or the melting of Cu-rich juvenile lower crust.The ore-forming parent rocks are typically depleted adakites.In contrast,parent rocks in intracontinental Cu-Au ore systems exhibit enriched isotopic compositions,yet their formation mechanisms and deep processes remain unclear.To address this,our study focuses on the central Yangtze River ore belt(CYROB)and adjacent areas.By compiling regional petrological and chronological data,we conducted multi-isotope tracing and Hf isotope mapping,integrated with regional seismic velocity tomography and magnetotelluric detection results,to reconstruct the lithospheric architecture and its evolutionary processes.Our findings indicate that the CYROB underwent significant crustal accretion during the Meso-and Neo-proterozoic,forming a juvenile crust.In the Late Mesozoic,the crust experienced polygenetic reworking,through two distinct periods(156–136 Ma and 136–120 Ma).During the transition from the Late Jurassic to the Early Cretaceous(156–140 Ma),in the area near and north of the Gaotan fault,lithospheric delamination in an extensional setting facilitated mantle convection and partial melting of enriched lithospheric mantle.This process modified the pre-existing juvenile lower crust,leading to the formation of adakites with slightly negativeεHf values(-5 to 0)and associated porphyry-skarn Cu-Au deposits.Concurrently,ascent of adakitic magma occasionally incorporated W-rich middle-to-upper crustal materials,enriching the melts in W and forming localized small-to medium-sized skarn W deposits.During 140–136 Ma,with the continued relaxation of lithospheric stress,a more intense modification of the lower crust by enriched mantle occurred west of Anqing and north of Qingyang.This led to the formation of adakic magmas with strongly negativeεHfvalues(-24 to-8)and related skarn Cu-Fe deposits.To the south of the Jiangnan fault,where the crust was deeper,mantle convection induced the remelting of Proterozoic reworked crust,releasing W and Mo into crust-derived melts,ultimately forming a series of large-and medium-sized porphyry-skarn W-Mo deposits.During the late period(136–120 Ma),progressive lithospheric extension triggered large-scale lithospheric delamination and oblique asthenospheric upwelling from the southeast to the northwest,further modifying the lower crust.The remelting of reworked crust with input from depleted mantle materials,led to the formation of extensive alkali-rich granitic batholiths.This study demonstrates that,under the extensional regime of the Late Mesozoic,the polygenic reworking of juvenile crust and the remelting of previously reworked crust—driven by ongoing lithosphere-scale delamination and asthenospheric upwelling—played a key role in controlling the temporal and spatial distribution of metal ore systems in the CYROB and adjacent areas.展开更多
This paper discusses the strategy for successfully predicting the location of potential hidden ore bodies in aged ore field, and presents the result of location prediction of hidden ore bodies in Fenghuangshan ore fie...This paper discusses the strategy for successfully predicting the location of potential hidden ore bodies in aged ore field, and presents the result of location prediction of hidden ore bodies in Fenghuangshan ore field, Tongling. Innovative conceptual targeting procedures based on a genetic understanding of mineralization systems, carefully geological investigation and correct deduction, together with new geochemical and geophysical technology and integrating of comprehensive information are all very important for the successful prediction. In the aged Fenghuangshan ore field, through researching by application of the metallogenic theory of polygenetic compound ore deposits and triple frequency induced polarization method and exploration tectono geochemical method, we predicted location and quality of hidden ore bodies. According to the prediction, hidden high quality Cu Au ore bodies of skarn type and porphyry type have been discovered.展开更多
Based on historistic-causationist geotectonics proposed by Chen Guoda in1992, the authors attempt to further extend its contents and ranges, establish integrative geo-tectonics with wide ranges and higher synthesis. I...Based on historistic-causationist geotectonics proposed by Chen Guoda in1992, the authors attempt to further extend its contents and ranges, establish integrative geo-tectonics with wide ranges and higher synthesis. Integrative geotectonics is defined as a disci-pline to study very synthetically the whole history and causationistic relations of formation and evolution of the global tectonics (including the crustal and deep teetospheric structures) with the comprehensive analysis method. It is also called as "crustobody geotectonics" for its main geotectonic element is crustobody. Its characteristics are: (1) regarding the internal and exter-nal dynamics forming the earth’s structure as multi-origined, polygenetic compound resultant force system; (2) studying motions of the global tectospheres and among them as a multiple and interrelative dynamic system; (3) studying integratively and the unitedly on the internaland extenal (e. g. meteorite impact) factors of evolution and motion of crustobodies constituting the earth’s hard shell (lithosphere); (4) besides the contents above reviewing main relative controversies in history of geology, e. g. between gradual change and mutation (or between uniformitarinanisnl and catastrophism), f ixism and mobilism, vertical and horizon-tal movements.展开更多
The paper discusses the tectonic setting of the fortnation of the Dexing giant copper-gold-lead-zinc deposit and its geological features and demonstrates in detail the polygenetic compound mechanism of its formation.
In Indian subcontinent one active volcano and another dormant volcano of Quaternary period are present in the Andaman Java subduction complex.The active Barren volcano throughout its history is erupting mainly tholeii...In Indian subcontinent one active volcano and another dormant volcano of Quaternary period are present in the Andaman Java subduction complex.The active Barren volcano throughout its history is erupting mainly tholeiitic basalt whereas the dormant Norcondam volcano is domal dacite and andesite volcano.In the Barren volcano wall,of 2km wide caldera is made up of prehistoric(~35 Ka)pyroclastics whereas the polygenetic tuff cone and valley fill are the products of historic(1787 yr)to recent activities of subaerial strombolian eruption and transient lava flows.展开更多
文摘Abstract: The Tongkuangyu metaporphyry copper deposit formed in the Early Proterozoic is tectonically located in the northern part of the Zhongtiao Λ-type palaeorift depression, on the southern margin of the North China platform. The genesis of the deposit has long been a hot subject of research of geologists working on mineral deposits. By means of the protolith reconstruction and fluid inclusion and isotope studies of host rocks of the deposits, the authors hold that this deposit is the product of combined exogenic, endogenic and metamorphic processes. Its formation mainly involved the following four stages: (1) the stage of formation of Mg- and Fe-rich tuffaceous variegated cupriferous sand-shale and K-rich biomodal volcanic rocks; (2) the early stage of formation of the metaporphyry copper deposit; (3) the stage of formation of the metaporphyry copper deposit; and (4) the stage of reworking of the metaporphyry copper deposit.
文摘Polygenetic compound ore deposits are here defined as those ore deposits which evidently possess n1any sided genetic characteristics as a comprehensive result of more than one rnineralization stages, from many rnaterial sources, and of many genetic types. They are formed most commonly during the diwa (geo(lepression) stage in the process of crustal evolution and, therefore, spread most widely in diwa regions. At the present stage of our knowledge, they may be subdivided into three principal models and many types of metallogenesis, controlled by different geotectonic conditions and being distributed in time and in space according to the corresponding regularities. This is a newly rccognizcd, third gcnetic type of ore deposits, being not reasonable to be simply referred to either pure endogenic or pure exogenic origin. They are very important and are of great study significance, becausc they comrnonly are rich and have a large amount of reserve with high economic value.
基金Supported by the Doctoral Foundation (No980 53 3 0 2 ) and U niversity Key Teacher Foundation of Ministryof Education and Tongling Group Corporation of Nonferrous Metal
文摘The metallogenic theory of polygenetic compound ore deposit is the important basis for location prediction of hidden ore deposits in diwa regions. It can play an important role in each step of prediction research, targeting procedure, acquiring information and integrating information. In this paper, the authors discusses how to construct geological concept by using of the metallogenic theory of polygenetic ore deposits for predicting targeting area, to arrange investigation and detection for getting enough useful information, and to analyze and integrate information for reaching a trustful prediction conclusion. According to these strategies, we conduct a successful prediction of location of hidden ore bodies in the outer of the Fenghuangshan copper mine, a principal producing mine in Tongling Cu Au district.
基金jointly funded by the National Key Technologies Research and Development Program(Grant Nos.2019YFA0708603,2023YFF0804203)the China Geological Survey(Grant No.DD20243510)+2 种基金the Scientific Research Fund Project of BGRIMM Technology Group(Grant No.JTKY202427822)the National Natural Science Foundation of China(Grant No.42073042)the Basic Scientific Research Fund of the Institute of Geology,Chinese Academy of Geological Sciences(Grant No.J2402)。
文摘Most giant porphyry-skarn Cu-Au ore systems are associated with either the metasomatic mantle wedge,formed by the dehydration of subducting oceanic crust,or the melting of Cu-rich juvenile lower crust.The ore-forming parent rocks are typically depleted adakites.In contrast,parent rocks in intracontinental Cu-Au ore systems exhibit enriched isotopic compositions,yet their formation mechanisms and deep processes remain unclear.To address this,our study focuses on the central Yangtze River ore belt(CYROB)and adjacent areas.By compiling regional petrological and chronological data,we conducted multi-isotope tracing and Hf isotope mapping,integrated with regional seismic velocity tomography and magnetotelluric detection results,to reconstruct the lithospheric architecture and its evolutionary processes.Our findings indicate that the CYROB underwent significant crustal accretion during the Meso-and Neo-proterozoic,forming a juvenile crust.In the Late Mesozoic,the crust experienced polygenetic reworking,through two distinct periods(156–136 Ma and 136–120 Ma).During the transition from the Late Jurassic to the Early Cretaceous(156–140 Ma),in the area near and north of the Gaotan fault,lithospheric delamination in an extensional setting facilitated mantle convection and partial melting of enriched lithospheric mantle.This process modified the pre-existing juvenile lower crust,leading to the formation of adakites with slightly negativeεHf values(-5 to 0)and associated porphyry-skarn Cu-Au deposits.Concurrently,ascent of adakitic magma occasionally incorporated W-rich middle-to-upper crustal materials,enriching the melts in W and forming localized small-to medium-sized skarn W deposits.During 140–136 Ma,with the continued relaxation of lithospheric stress,a more intense modification of the lower crust by enriched mantle occurred west of Anqing and north of Qingyang.This led to the formation of adakic magmas with strongly negativeεHfvalues(-24 to-8)and related skarn Cu-Fe deposits.To the south of the Jiangnan fault,where the crust was deeper,mantle convection induced the remelting of Proterozoic reworked crust,releasing W and Mo into crust-derived melts,ultimately forming a series of large-and medium-sized porphyry-skarn W-Mo deposits.During the late period(136–120 Ma),progressive lithospheric extension triggered large-scale lithospheric delamination and oblique asthenospheric upwelling from the southeast to the northwest,further modifying the lower crust.The remelting of reworked crust with input from depleted mantle materials,led to the formation of extensive alkali-rich granitic batholiths.This study demonstrates that,under the extensional regime of the Late Mesozoic,the polygenic reworking of juvenile crust and the remelting of previously reworked crust—driven by ongoing lithosphere-scale delamination and asthenospheric upwelling—played a key role in controlling the temporal and spatial distribution of metal ore systems in the CYROB and adjacent areas.
基金Doctoral Foundation and University Key Teacher Foundation of Ministry of Education andby Tongling Group Corporation of Nonferrous Metals
文摘This paper discusses the strategy for successfully predicting the location of potential hidden ore bodies in aged ore field, and presents the result of location prediction of hidden ore bodies in Fenghuangshan ore field, Tongling. Innovative conceptual targeting procedures based on a genetic understanding of mineralization systems, carefully geological investigation and correct deduction, together with new geochemical and geophysical technology and integrating of comprehensive information are all very important for the successful prediction. In the aged Fenghuangshan ore field, through researching by application of the metallogenic theory of polygenetic compound ore deposits and triple frequency induced polarization method and exploration tectono geochemical method, we predicted location and quality of hidden ore bodies. According to the prediction, hidden high quality Cu Au ore bodies of skarn type and porphyry type have been discovered.
文摘Based on historistic-causationist geotectonics proposed by Chen Guoda in1992, the authors attempt to further extend its contents and ranges, establish integrative geo-tectonics with wide ranges and higher synthesis. Integrative geotectonics is defined as a disci-pline to study very synthetically the whole history and causationistic relations of formation and evolution of the global tectonics (including the crustal and deep teetospheric structures) with the comprehensive analysis method. It is also called as "crustobody geotectonics" for its main geotectonic element is crustobody. Its characteristics are: (1) regarding the internal and exter-nal dynamics forming the earth’s structure as multi-origined, polygenetic compound resultant force system; (2) studying motions of the global tectospheres and among them as a multiple and interrelative dynamic system; (3) studying integratively and the unitedly on the internaland extenal (e. g. meteorite impact) factors of evolution and motion of crustobodies constituting the earth’s hard shell (lithosphere); (4) besides the contents above reviewing main relative controversies in history of geology, e. g. between gradual change and mutation (or between uniformitarinanisnl and catastrophism), f ixism and mobilism, vertical and horizon-tal movements.
文摘The paper discusses the tectonic setting of the fortnation of the Dexing giant copper-gold-lead-zinc deposit and its geological features and demonstrates in detail the polygenetic compound mechanism of its formation.
文摘In Indian subcontinent one active volcano and another dormant volcano of Quaternary period are present in the Andaman Java subduction complex.The active Barren volcano throughout its history is erupting mainly tholeiitic basalt whereas the dormant Norcondam volcano is domal dacite and andesite volcano.In the Barren volcano wall,of 2km wide caldera is made up of prehistoric(~35 Ka)pyroclastics whereas the polygenetic tuff cone and valley fill are the products of historic(1787 yr)to recent activities of subaerial strombolian eruption and transient lava flows.
