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Provenance of the Lower Jurassic pyroclastic sediments in the Zigui Basin:Implication for crustal thickening in the eastern Qinling orogenic belt

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Science China Earth Sciences 2024年第1期67卷 196-207页

作者： Rong CHAI Jianghai YANG Yuansheng DU Chengshan WANG School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100023China School of Earth Sciences China University of Geosciences(Wuhan)Wuhan 430074China Chinese Academy of Geological Sciences Beijing 100037China

The Late Triassic witnessed significant collisional orogenic events in the Qinling orogenic belt,accompanied by magma underplating and tectonic *** processes potentially resulted in substantial crustal thickening and uplift of the Qinling ***,due to the absence of igneous rock records from this period in the eastern section of the Qinling orogen,the changes in crustal thickness during this orogenic process have not been thoroughly investigated.A series of foreland basins emerged during the Early Mesozoic to the south of the East Qinling orogenic *** basins have preserved clastic sedimentary rocks derived from the uplift and erosion of the orogenic *** sedimentary records serve as crucial records to reconstruct the evolutionary history of the Qinling *** further clarify the collisional orogenic process of the Qinling orogenic belt,this study conducted in situ volcanic lithic fragment geochemistry,detrital zircon U-Pb chronology and trace element composition analysis on the sandstones of the Lower Jurassic Tongzhuyuan Formation in the Zigui *** results suggest that the sandstones,which exhibit a significant abundance of volcanic lithic fragments,has a characteristic detrital zircon age group of 250–200 Ma,indicating a major provenance from the Triassic volcanic *** with regional correlation and paleocurrent analysis,the detrital zircon U-Pb age data show that the source area of volcanic rocks should be in the Qinling orogenic belt to the north of the *** interpretation is further supported by the Triassic granitic rocks exposed in the western part of the orogenic belt,representing the magmatism during the Triassic collisional orogenesis in the Qinling *** on the co-varying relationships between present-day crust thickness with the chemical compositions of granite rocks and zircons,the La/Yb ratio of volcanic lithic fragments in the Tongzhuyuan Formation and the Eu/Eu*ratio of detrital zircon

关键词： Qinling orogenic belt Zigui Basin Late Triassic Detrital zircons crustal thickening

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Late Cretaceous K-rich rhyolitic crystal tuffs from the Chuduoqu area in Eastern Qiangtang subterrane:evidence for crustal thickening of the central Tibetan Plateau prior to India–Asia collision

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Acta Geochimica 2022年第1期41卷 147-163页

作者： Yonggang Sun Bile Li Fengyue Sun Qingfeng Ding Junlin Dong Ye Qian Yujin Li Zhen Yao College of Earth Sciences Jilin University2199 Jianshe StreetChangchun 130061China College of Mining Liaoning Technical UniversityFuxin 123000China No.5 Geologic Exploration Institute of Qinghai Province Xining 810003China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Land and ResourcesChangchun 130061China

In order to constrain whether the Lhasa–Qiangtang collision contributed to an early crustal thickening of the central Tibetan Plateau prior to the India–Asia collision,we present zircon LA–ICP–MS U–Pb ages,wholerock geochemistry,and zircon Hf isotopic compositions of the newly discovered rhyolitic crystal tuffs from the Chuduoqu area in the eastern Qiangtang subterrane,central *** U–Pb dating suggests that the Chuduoqu rhyolitic crystal tuffs were emplaced at ca.68 *** Chuoduoqu rhyolitic crystal tuffs display high SiO_(2) and K2 O,and low MgO,Cr,and *** with their zircon Hf isotopic data,we suggest that they were derived from partial melting of the juvenile lower crust,and the magma underwent fractional crystallization and limited upper continental crustal assimilation during its evolution prior to *** should be formed in a post-collisional environment related to lithospheric mantle *** Chuduoqu rhyolitic crystal tuffs could provide important constraints on the Late Cretaceous crustal thickening of the central Tibetan Plateau caused by the Lhasa–Qiangtang collision.

关键词： Rhyolitic crystal tuffs Late Cretaceous crustal thickening Lhasa-Qiangtang collision Central Tibetan Plateau

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MECHANISM FOR crustal thickening IN TIBET: A PALEOMAGNETIC VIEW

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地震地质 1987年第4NO.03NO.02NO.01期 49-54页

作者： Lin Jin-lu(Institute of Geology, Academia Sinica)

The mid-Gretaceous paleomagnetic pole for the Lhasa Terrane (69.8°N 292.9°E, A95 = 5.1°) is in strong discordance with that for the stable Eurasia (69.5°N 167.4°E, A95 = 8.7°), which suggests that the Lhasa Terrane has moved 2400±800 km NNEward and rotated 31.4±9.2 counterclockwise with respect to the stable Eurasia. The relative motion started at the time when the Indian plate began to collide with the Eurasian plate (or maybe started a little earlier), and was accomplished through the internal deformation of the southern Eurasian continent. As far as the mechanism is concerned for the crustal thickening in the Tibetan Plateau, the paleomagnetic data are therefore in favor of the internal deformation hypothesis within the Tibetan crust, but raise further challenge to the hypothesis of longdistance underthrusting of the Tibetan Plateau by the Indian subcontinent.

关键词： Tibetan Plateau crustal shortening crustal thickening Paleomagnetism Internal deformation within continents

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Early Eocene crustal thickening in southern Tibet:New age and geochemical constraints from the Gangdese batholith

Early Eocene crustal thickening in southern Tibet:New age an...

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中国科学院地质与地球物理研究所2012年度（第12届）...

作者： Wei-Qiang Ji Fu-Yuan Wu Chuan-Zhou Liu Sun-Lin Chung State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geosciences National Taiwan University

The Lhasa terrane,southern Tibet is where the thickest part of the Earth’s crust occurs as a result of the India-Asia *** paper reports zircon U-Pb age and geochemical data of samples collected from the Gangdese batholith,southern Lhasa terrane,a subset of which has already been dated at 65-41 Ma using zircon U-Pb geochronology(Ji,W.Q.,Wu,F.Y.,Chung,S.L.,Li,J.X.,Liu,C.Z.,*** U-Pb chronology and Hf isotopic constraints on the pedogenesis of Gangdese batholiths,southern *** Geology 262,229-245),to constrain the timing and mechanism(s) responsible for crustal thickening beneath southern *** new data indicate that the Gangdese magmatism lasted continuously from ca.65 to 34 Ma,during which geochemical evidence forcrustal thickening is *** thickening is best illustrated by the progressive increase in La/Yb and Sr/Y of the Early to latest Eocene magmatic rocks,associated with the decrease in Hf isotopic ratios of Paleocene to Eocene magmatic *** also identify in this study the oldest(ca.51 Ma),"post-collislonal"adakitic granitoids in the Gangdese batholith, interpreted as products from partial melting of underplated basaltic lower ***,a thickened crust likely existed by that time,at least locally,in the southern Lhasa terrane,Tibet.

关键词： Eocene crustal thickening Gangdese batholith Zircon U-Pb age and Hf isotope Geochemistry Lhasa terrene Tibet

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Geochronology and geochemistry of the W-Mo-ore-related granitic rocks from eastern Ningzhen,lower Yangtze river belt,eastern China

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Acta Geochimica 2022年第2期41卷 288-306页

作者： Fangyue Wang Yongjie Guo Haiyang Yan Haiou Gu He Sun Can Ge Present Address:School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Ore Deposit and Exploration Center Hefei University of TechnologyHefei 230009China Anhui Institute of Geological Survey(Anhui Institute of Geological Sciences) Hefei 230001China

Here we present zircon U–Pb–Hf and wholerock major and trace element studies of eastern Ningzhen W-Mo-ore-related magmatic rocks,Yushan and Longwangshan granitic rocks,to constrain their form timing,magma sources,and tectonic *** results showed that the two plutons were formed in the Early Cretaceous with;Pb/;U ages of 107.8±1.2 and 105.2±1.5 Ma(;Pb/;U),*** trapped/residual zircons are mainly distributed in 2.0–2.5 *** two intrusions are characterized by high silicon(68.60–73.99%),high aluminum(13.56–15.02%),high Mg#(47–55),high Sr,Sr/Y,LaN/YN,and low Yb,falling into high Mg#adakitic rock *** zirconεHf(t)values of the two intrusions range from-24.8 to-13.2,indicating an ancient continental crust in their magma *** average Ti-inzircon temperature is 689°C,slightly higher than those of other high-Mg adakitic rocks in the lower Yangtze River belt,but lower than those of high-Mg adakitic rocks in the Southern Tanlu Fault(STLF).Zircon Ce;/Ce;show low oxygen fugacity(LWS-1:3–400,average 92;sample ZYS-4:9–382,average 93).These geochemical features indicate a thickened lower continental crust in the Eastern Ningzhen region in a subduction *** the geochemical characteristics of the eastern Ningzhen to the western Ningzhen and other areas in the Lower Yangtze River Metallogenic Belt(LYRMB)and the high-Mg ore-barren adakitic rocks of the STLF,we propose that the magmatic rocks from eastern Ningzhen may be mainly from a thickened lower continental crust that hybridized with a very small part of mantle sources,while the west Ningzhen magmatic rocks may have experienced a higher degree of mantle contaminations in their *** metallogenic differences between the eastern(W–Mo)and western(Cu–Fe–Pb–Zn)parts of Ningzhen also indicate different proportions of crustal materials in their magma source.

关键词： Ancient lower continental crust Paleo-pacific plate High Mg#adaktic rocks Early cretaceous Ningzhen crustal thickening

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The Himalayan Collisional Orogeny:A Metamorphic Perspective

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Acta Geologica Sinica(English Edition) 2022年第6期96卷 1842-1866页

作者： WANG Jiamin WU Fuyuan ZHANG Jinjiang Gautam KHANAL YANG Lei State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth and Space Sciences Peking UniversityBeijing 100871China Department of Mines and Geology of Nepal Kathmandu 44600Nepal College of Earth Sciences Chengdu University of TechnologyChengdu 610059China

This paper introduces how crustal thickening controls the growth of the Himalaya by summarizing the P-T-t evolution of the Himalayan metamorphic *** Himalayan orogeny was divided into three *** 60–40 Ma:The Himalayan crust thickened to~40 km through Barrovian-type metamorphism(15–25°C/km),and the Himalaya rose from30°C/km).The three sub-sheets in the Himalayan metamorphic core extruded southward sequentially through imbricate thrusts of the Eo-Himalayan thrust,High Himalayan thrust,and Main Central thrust,and the Himalaya rose to≥5,000 *** 16–0 Ma:the mountain roots underwent localized delamination,causing asthenospheric upwelling and overprinting of the lower crust by ultra-high-temperature metamorphism(30–50°C/km),and the Himalaya reached the present elevation of~6,000 *** and imbricate thrusting dominated the Himalaya’growth and topographic rise,conforming to the critical taper wedge *** delamination of mountain roots facilitated further topographic *** Himalayan metamorphic studies should focus on extreme metamorphism and major collisional events,contact metamorphism and rare metal mineralization,metamorphic decarbonation and the carbon cycle in collisional belts.

关键词： continental collision crustal thickening mountain uplift critical taper wedge and channel flow P-T-t path Himalaya

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Indian plate blocked by the thickened Eurasian crust in the middle of the continental collision zone of southern Tibet

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Earthquake Research Advances 2023年第3期3卷 42-52页

作者： Gaochun Wang Xiaobo Tian Yibing Li Tao Xu Bo Wan Yi Chen Shitan Nie Xusong Yang Sicheng Zuo Jianli Zhang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Geothermal and Ecological Geology Research Center School of Ecology and EnvironmentZhengzhou UniversityZhengzhou450001China Innovation Academy for Earth Science CASBeijing100029China Frontiers Science Center for Deep Ocean Multispheres and Earth System Institute for Advanced Ocean StudyOcean University of ChinaQingdao266100China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China

The relationship of the crustal contact between the Indian and Eurasian plates is a key issue in understanding crustal thickening and the subduction of the Indian lithosphere beneath the Qinghai-Tibetan Plateau. Across the middle of the Yarlung-Zangbo Suture(YZS), we deployed an ~450-km-long SN-trending wide-angle reflection/refraction profile to observe the P-wave velocity(vP) structure beneath the northern Himalaya and the southern plateau. Our results show that, 1. the high vP(~7.1 km/s) indicates that the Indian lower crust extends no more than 50 km north of the YZS. 2. The lower crust beneath the southern part of the plateau features an extremely low vP(crustal lithologies in different temperature regimes, the low vPin the lower crust can be explained by felsic-intermediate granulite, which has prevented the lower crust from further eclogitization. We propose that the dip angle of the Indian lithospheric slab beneath the YZS is partly controlled by the composition of the lower crust of the plateau. In the northern middle YZS, the crust of the southern plateau is too thick and blocks the northward advancement of the Indian lower crust, resulting in the subduction of the Indian lithospheric slab into the upper mantle. The lower crust in western and eastern Lhasa is dominated by a mafic composition, and it was delaminated after eclogitization before the Miocene. The void zone generated by delamination favors the flattening and underthrusting of the Indian lower crust.

关键词： Qinghai-Tibetan Plateau Indian lithospheric slab Wide-angle reflection/refraction crustal P-wave velocity structure crustal thickening

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Discovery of deep-level foreland thrust-fold structures in Taihang *** its implication for early tectonic evolution of North China

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Progress in Natural Science:Materials International 2005年第3期 37-46页

作者： Timothy M KUSKY,Ali POLAT Department of Earth and Atmospheric Sciences Saint Louis University St.Louis MO63103 USA Department of Earth Sciences University of Windsor Windsor ON N9B3P4 Canada

Delineation and correlation of Dragon Spring Shear Zone with its deep-level structures at foreland have been studied by field *** paper reports our new findings of thrust-fold structures within Taihang Neoarchean basement,which include flat thrusts,large-scale recumbent folds,subhorizontal foliation patterns,*** reveals that early tectonic evolution of North China clearly involves the horizontal contraction on a large scale,comparable to those of foreland of classical collisional orogenic *** vertical variation of struc-tural patterns with foreland fold-thrust belt from shallow to deep levels has been documented for Taihang *** structural correlation,which is associated with tectonic transposition and imbrication of basement complex with supracrustal sequences in the Neoarchean.

关键词： recumbent fold shear zone crustal thickening collisional tectonics foreland Neoarchean.

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