首页|Provenance Analysis of the Cenozoic Sedimentary Successions in the Ningnan Basin,NE Tibetan Plateau:Constraints on Sedimentological and Tectonomorphological Evolution

Provenance Analysis of the Cenozoic Sedimentary Successions in the Ningnan Basin,NE Tibetan Plateau:Constraints on Sedimentological and Tectonomorphological Evolution

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Provenance Analysis of the Cenozoic Sedimentary Successions in the Ningnan Basin,NE Tibetan Plateau:Constraints on Sedimentological and Tectonomorphological Evolution
The evolution and reforming history of the Cenozoic basins in the northeastern Tibetan Plateau(NETP)are significant for understanding the northeastward growth of the Tibetan Plateau.The sediments in these basins archived the spatial-temporal patterns of the surface uplift and deformation processes in response to remote effects of growth of the NETP.Here,we present an integrated provenance analysis of the Ningnan basin in the NETP to provide direct insights into the basin evolution and further constraints of the Tibetan Plateau's northeastward growth.In this study,the Cenozoic strata(Sikouzi,Qingshuiying,Zhang'enpu and Ganhegou formations)in the Ningnan basin yield complex detrital zircon age distributions featured by predominant age populations at 200-360 Ma and 360-540 Ma with minor Precambrian ages.Detrital zircon U-Pb ages indicate that the southwestern Ordos Block,the western Qinling orogenic belt,and the eastern Qilian orogenic belt are primary source areas.Additionally,adjacent local paleo-uplifts(e.g.,Xihua,Nanhua,Xiangshan,Liupan Mts.)also provided minor volumes of sediment.In addition,conglomerates and paleocurrent directions of the Sikouzi-Ganhegou formations exhibit an apparent change since the late Miocene,revealing an obvious provenance shift.The quantitatively determined mixing proportions of the surrounding source areas also reveals that the early source-to-sink system was replaced during the deposition of the Ganhegou Formation.Combined with previous studies,we suggest that the formation of the Ningnan basin was controlled by normal faults in extension setting and experienced continued sediment accumulation during the Qingshuiying-Zhang'enpu period;since the late Miocene,the significant provenance shift reflects the obvious northeastward growth of the NETP and led to the extinction of the Ningnan basin.

provenancedetrital zircon geochronologyCenozoicNingnan basinnortheastern Tibetan Plateau

ZHAO Xiaochen、ZHAO Shaowei、LIU Chiyang、WANG Jianqiang、HUANG Lei、NIU Yazhuo、CHEN Yingtao、DU Fangpeng、PENG Heng、FENG Zeyi、DONG Yingchun

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College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China

Key Laboratory of Western China's Mineral Resources and Geological Engineering,Ministry of Education,Chang'an University,Xi'an 710054,China

School of Earth Science and Resources,Chang'an University,Xi'an 710054,China

State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,China

Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits,Xi'an Center of Geological Survey(Northwest China Center of Geoscience Innovation),China Geological Survey,Xi'an 710119,China

School of Petroleum Engineering and Environmental Engineering,Yan'an University,,Yan'an,Shaanxi 716000,China

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provenance detrital zircon geochronology Cenozoic Ningnan basin northeastern Tibetan Plateau

2024

10.1111/1755-6724.15165

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(6)