A synthesis involving the data for the Nalati mountain region（NMR） in west Tianshan with a dataset including zircon U-Pb ages, Hf isotopic composition, major and trace elements of Paleozoic intrusions are presented ...A synthesis involving the data for the Nalati mountain region（NMR） in west Tianshan with a dataset including zircon U-Pb ages, Hf isotopic composition, major and trace elements of Paleozoic intrusions are presented to improve the understanding of regional geodynamic evolution. Paleozoic intrusive rocks in the NMR could be classified into four categories based on chronological and geochemical data： 480？5 Ma, 445–410 Ma, 345–320 Ma, and 295 Ma, which correspond to（1） closure of the Terskey Ocean and the opening of the south Tianshan back-arc basin, which was followed with the opening of the south Tianshan Ocean,（2） initial subduction of the south Tianshan oceanic crust,（3） major subduction stage, and（4） collision to post-collisional stage, respectively. Following the closure of the Terskey Ocean, the south Tianshan Ocean opened at Early Silurian and subducted under Yili-central Tianshan by the end of Early Carboniferous Period. The following breakoff of the subducted slab triggered partial melting of continental crust and formed voluminous granitic rocks in the NMR.展开更多
Objective The Susong complex zone（SCZ）is a relatively lowgrade metamorphic unit mostly with an epidoteamphibolite facies,located in the southernmost part of the Dabie orogen.However,its rock compositions,ages,
1 Introduction The North Qinling orogenic belt is characterized by diverse rocks,multi-phase tectonic-magmatic events,which is composed of not only basement rocks of the Qinling Group,but also numerous magmatic rocks in
The Qinling-Qilian connection zone(QQCZ)is a key area to reveal the relationship and to make a link of the North Qinling and the North Qilian orogens,China.Here we present U-Pb dating data of detrital zircons from fou...The Qinling-Qilian connection zone(QQCZ)is a key area to reveal the relationship and to make a link of the North Qinling and the North Qilian orogens,China.Here we present U-Pb dating data of detrital zircons from four sedimentary/metasedimentary rocks in the QQCZ and the southwestern North China Block(NCB)and detailed regional structural data.Three episodes of fold deformation(D1,D2 and D3)are distinguished in the QQCZ,with the former two occurred during the early Paleozoic.The D1 deformation is mainly characterized by regionally penetrative schistosity and some residual rootless intrafolial folds due to the intensive superpositions by the subsequent D2 and D3 deformations.The D2 deformation characterized by tight folds,associated axial plane foliations and crenulation lineations indicates a stress field characterized by NNE-SSW-directed compression,which may be induced by the collision between the NCB and the southern blocks.The D3 deformation which might occur during the Mesozoic is marked by upright open folds and kink bands.The similarity of the detrital zircon age spectra of the Huluhe Group in the North Qilian Orogen and the Erlangping Group in the North Qinling Orogen suggests that the two groups have similar provenance,which may indicate that the North Qilian Orogen corresponded to the North Qinling Orogen in a regional tectonic framework.In addition,the remarkable age peak at^435 Ma of the detrital zircon age spectrum of the Duanjiaxia Formation in the southwestern NCB indicates that this formation obtained the provenance of the North Qilian and North Qinling orogens,which may be generated by the collage of the southwestern NCB and the QQCZ during the Late Ordovician-Early Silurian.Based on structural,detrital zircon and metamorphic data,we suggest that the North Qilian and North Qinling orogens underwent similar evolution during the early Paleozoic due to the closure of the North Qilian and the Kuanping oceans which located at the northern boundary of the Proto-Tethys Ocean.展开更多
The Tongbai orogenic belt(TOB)is composed of six tectonic units.From south to north these units are:Tongbai gneiss rise(TGR);Hongyihe-Luozhuang eclogite belt(HLE);Ma-opo-Hujiazhai igneous rock belt(MHI);Zhoujiawan fly...The Tongbai orogenic belt(TOB)is composed of six tectonic units.From south to north these units are:Tongbai gneiss rise(TGR);Hongyihe-Luozhuang eclogite belt(HLE);Ma-opo-Hujiazhai igneous rock belt(MHI);Zhoujiawan flysch belt(ZFB);Yangzhuang greenschist belt(YGB);and Dongjiazhuang marble belt(DMB).The geometry and kinematic images of the TOB in-clude:the antiformal structures caused by a later uplift process,the top-to-north ductile shear struc-ture that related to a process that the ultrahigh pressure rocks are brought to surface,the top-to-south ductile shear thrust and the sinistrial shear structures related to a south-north direction compression,and the east-west direction fold structures in the upper crust.In the view of the multistage subduc-tion-collision orogenic belt,according to the characters of petrology and its distribution,geometry,kinematics and structural chronology in these tectonic units,tectonic evolution of the TOB can be divided into four stages:oceanic crust subduction during 400―300 Ma,continental collision during 270―250 Ma,continental deep subduction and uplift during 250―205 Ma and doming deformation during 200―185 Ma.展开更多
In order to better understand the role of post-collisional mafic magmatism at convergent plate boundaries in revealing the earth’s evolution,this paper has systematically summarized the research history of post-colli...In order to better understand the role of post-collisional mafic magmatism at convergent plate boundaries in revealing the earth’s evolution,this paper has systematically summarized the research history of post-collisional mafic magmatism,different types of collision and their influence on the nature of orogenic mantle,the concept and implication of post-collisional magmatism,and the relationship between post-collisional mafic magmatism and orogenic mantle evolution and mineralization.Post-collisional mafic igneous rocks are not only the direct records for studying the nature and evolution of orogenic mantle,but also the important carriers for regional mineralization.However,the type and quantity of the crustal materials involved in modifying the overlying lithospheric mantle during collisional orogeny,the process and mechanism of such modification,and the major control factors and mechanism of mafic magmatism-related mineralization during the post-collisional period are the main contents and direction of future researches in this field.Therefore,the study of post-collisional mafic magmatism is of significant implications for developing the theory of plate tectonics.展开更多
Three types of granitoids were recognized in Tuerkubantao （土尔库班套） district, located on the northwestern margin of the Junggar Block. The zircon U-Pb age of the three types of granitoids suggests that they forme...Three types of granitoids were recognized in Tuerkubantao （土尔库班套） district, located on the northwestern margin of the Junggar Block. The zircon U-Pb age of the three types of granitoids suggests that they formed in different orogenic stage in response to the convergence and collision be- tween Siberian and Kazakhstan plates. Biotite granite is similar to the volcanic arc granites in composi- tion, with zircon U-Pb age of 382.8±2.5 and 355.6±2.4 Ma. The former is crystallizing age of the volcan- ic arc granite, while the later record the time of hydrothermal alteration induced by a later magmatism. The granite is severe altered and its zircon grain get a lower intercept age of 324.4±7.3 Ma, which is possibly coursed by magmatism in syn-collision. The rhyolite with composition similar to A-type gra- nites in adjacent area, crystallized at 295.9±1.4 Ma, is possibly the extrusive phase of A-type granite formed in the post-orogenic tectonic setting. The granitoids in Tuerkubantao area record the evolution of the northwestern Junggar orogen. The area has been in convergence setting from Middle to Late Devonian, and stepped into syn-collisional tectonic setting in Early Carboniferous, finally evolved into the post-orogenic tectonic stage since Early Permian.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.41372062, 41330210, 41672047)
文摘A synthesis involving the data for the Nalati mountain region（NMR） in west Tianshan with a dataset including zircon U-Pb ages, Hf isotopic composition, major and trace elements of Paleozoic intrusions are presented to improve the understanding of regional geodynamic evolution. Paleozoic intrusive rocks in the NMR could be classified into four categories based on chronological and geochemical data： 480？5 Ma, 445–410 Ma, 345–320 Ma, and 295 Ma, which correspond to（1） closure of the Terskey Ocean and the opening of the south Tianshan back-arc basin, which was followed with the opening of the south Tianshan Ocean,（2） initial subduction of the south Tianshan oceanic crust,（3） major subduction stage, and（4） collision to post-collisional stage, respectively. Following the closure of the Terskey Ocean, the south Tianshan Ocean opened at Early Silurian and subducted under Yili-central Tianshan by the end of Early Carboniferous Period. The following breakoff of the subducted slab triggered partial melting of continental crust and formed voluminous granitic rocks in the NMR.
基金financially supported by the National Basic Research Program of China(grant No.2015CB856104)the National Natural Science Foundation of China(grant No.41773020)
文摘Objective The Susong complex zone（SCZ）is a relatively lowgrade metamorphic unit mostly with an epidoteamphibolite facies,located in the southernmost part of the Dabie orogen.However,its rock compositions,ages,
基金financially supported by National Natural Science Foundation of China (41372072)Natural Science Foundation of Education Department of Anhui province (KJ2016A025)+1 种基金Dr. Startup Foundation, Anhui university (J10113190090)the State Key Laboratory of Geodynamics, Northwest University
文摘1 Introduction The North Qinling orogenic belt is characterized by diverse rocks,multi-phase tectonic-magmatic events,which is composed of not only basement rocks of the Qinling Group,but also numerous magmatic rocks in
基金funded by the National Natural Science Foundation of China(Gant Nos.41702206,41602042 and 41502042)National Key Research and Development Program of China(Grant No.2016YFC0601002)+1 种基金supported by Aoshan Talents Program of Qingdao National Laboratory for Marine Science and Technology(Grant No.2015ASTP-0S10)Taishan Scholar Program to Prof.Sanzhong Li。
文摘The Qinling-Qilian connection zone(QQCZ)is a key area to reveal the relationship and to make a link of the North Qinling and the North Qilian orogens,China.Here we present U-Pb dating data of detrital zircons from four sedimentary/metasedimentary rocks in the QQCZ and the southwestern North China Block(NCB)and detailed regional structural data.Three episodes of fold deformation(D1,D2 and D3)are distinguished in the QQCZ,with the former two occurred during the early Paleozoic.The D1 deformation is mainly characterized by regionally penetrative schistosity and some residual rootless intrafolial folds due to the intensive superpositions by the subsequent D2 and D3 deformations.The D2 deformation characterized by tight folds,associated axial plane foliations and crenulation lineations indicates a stress field characterized by NNE-SSW-directed compression,which may be induced by the collision between the NCB and the southern blocks.The D3 deformation which might occur during the Mesozoic is marked by upright open folds and kink bands.The similarity of the detrital zircon age spectra of the Huluhe Group in the North Qilian Orogen and the Erlangping Group in the North Qinling Orogen suggests that the two groups have similar provenance,which may indicate that the North Qilian Orogen corresponded to the North Qinling Orogen in a regional tectonic framework.In addition,the remarkable age peak at^435 Ma of the detrital zircon age spectrum of the Duanjiaxia Formation in the southwestern NCB indicates that this formation obtained the provenance of the North Qilian and North Qinling orogens,which may be generated by the collage of the southwestern NCB and the QQCZ during the Late Ordovician-Early Silurian.Based on structural,detrital zircon and metamorphic data,we suggest that the North Qilian and North Qinling orogens underwent similar evolution during the early Paleozoic due to the closure of the North Qilian and the Kuanping oceans which located at the northern boundary of the Proto-Tethys Ocean.
基金This work was supported by the National Natural Science Foundation of China(Grant No.40272098)the Major State Basic Research Development Program of China(Grant No.G1999075511).
文摘The Tongbai orogenic belt(TOB)is composed of six tectonic units.From south to north these units are:Tongbai gneiss rise(TGR);Hongyihe-Luozhuang eclogite belt(HLE);Ma-opo-Hujiazhai igneous rock belt(MHI);Zhoujiawan flysch belt(ZFB);Yangzhuang greenschist belt(YGB);and Dongjiazhuang marble belt(DMB).The geometry and kinematic images of the TOB in-clude:the antiformal structures caused by a later uplift process,the top-to-north ductile shear struc-ture that related to a process that the ultrahigh pressure rocks are brought to surface,the top-to-south ductile shear thrust and the sinistrial shear structures related to a south-north direction compression,and the east-west direction fold structures in the upper crust.In the view of the multistage subduc-tion-collision orogenic belt,according to the characters of petrology and its distribution,geometry,kinematics and structural chronology in these tectonic units,tectonic evolution of the TOB can be divided into four stages:oceanic crust subduction during 400―300 Ma,continental collision during 270―250 Ma,continental deep subduction and uplift during 250―205 Ma and doming deformation during 200―185 Ma.
基金the National Key R&D Program of China(Grant No.2016YFC0600103)the National Natural Science Foundation of China(Grant Nos.91858211&41822302).
文摘In order to better understand the role of post-collisional mafic magmatism at convergent plate boundaries in revealing the earth’s evolution,this paper has systematically summarized the research history of post-collisional mafic magmatism,different types of collision and their influence on the nature of orogenic mantle,the concept and implication of post-collisional magmatism,and the relationship between post-collisional mafic magmatism and orogenic mantle evolution and mineralization.Post-collisional mafic igneous rocks are not only the direct records for studying the nature and evolution of orogenic mantle,but also the important carriers for regional mineralization.However,the type and quantity of the crustal materials involved in modifying the overlying lithospheric mantle during collisional orogeny,the process and mechanism of such modification,and the major control factors and mechanism of mafic magmatism-related mineralization during the post-collisional period are the main contents and direction of future researches in this field.Therefore,the study of post-collisional mafic magmatism is of significant implications for developing the theory of plate tectonics.
基金supported by the Major State BasicResearch Program of China(No.2007CB411304)the Crisis Mine Project of China National Geological Survey(No.200699105)
文摘Three types of granitoids were recognized in Tuerkubantao （土尔库班套） district, located on the northwestern margin of the Junggar Block. The zircon U-Pb age of the three types of granitoids suggests that they formed in different orogenic stage in response to the convergence and collision be- tween Siberian and Kazakhstan plates. Biotite granite is similar to the volcanic arc granites in composi- tion, with zircon U-Pb age of 382.8±2.5 and 355.6±2.4 Ma. The former is crystallizing age of the volcan- ic arc granite, while the later record the time of hydrothermal alteration induced by a later magmatism. The granite is severe altered and its zircon grain get a lower intercept age of 324.4±7.3 Ma, which is possibly coursed by magmatism in syn-collision. The rhyolite with composition similar to A-type gra- nites in adjacent area, crystallized at 295.9±1.4 Ma, is possibly the extrusive phase of A-type granite formed in the post-orogenic tectonic setting. The granitoids in Tuerkubantao area record the evolution of the northwestern Junggar orogen. The area has been in convergence setting from Middle to Late Devonian, and stepped into syn-collisional tectonic setting in Early Carboniferous, finally evolved into the post-orogenic tectonic stage since Early Permian.
