Convergence of the Pamir and the South Tian Shan in the late Cenozoic
- In response to collision and convergence between India and Asia during the Cenozoic, convergence took place between the Pamir and South Tian Shan. Here we present new detrital zircon U-Pb ages coupled with conglomerate clast counting and sedimentary data from the late Cenozoic Wuheshalu section in the convergence zone, to shed light on the convergence process of the Pamir and South Tian Shan. Large Triassic zircon U-Pb age populations in all seven samples suggest that Triassic igneous rocks from the North Pamir were the major source area for the late Cenozoic Wuheshalu section. In the Miocene, large populations of the North Pamir component supports rapid exhumation in the North Pamir and suggest that topography already existed there since the early Miocene. Exhumation of the South Tian Shan was relatively less important in the Miocene and its detritus could only reach a limited area in the foreland area. Gradually increasing sediment loading and convergence of the Pamir and South Tian Shan caused rapid subsidence in the convergenceIn response to collision and convergence between India and Asia during the Cenozoic, convergence took place between the Pamir and South Tian Shan. Here we present new detrital zircon U-Pb ages coupled with conglomerate clast counting and sedimentary data from the late Cenozoic Wuheshalu section in the convergence zone, to shed light on the convergence process of the Pamir and South Tian Shan. Large Triassic zircon U-Pb age populations in all seven samples suggest that Triassic igneous rocks from the North Pamir were the major source area for the late Cenozoic Wuheshalu section. In the Miocene, large populations of the North Pamir component supports rapid exhumation in the North Pamir and suggest that topography already existed there since the early Miocene. Exhumation of the South Tian Shan was relatively less important in the Miocene and its detritus could only reach a limited area in the foreland area. Gradually increasing sediment loading and convergence of the Pamir and South Tian Shan caused rapid subsidence in the convergence area. Since ca. 6-5.3 Ma, the combination of a major North Pamir component and a minor South Tian Shan component at the Wuheshalu section is consistent with active deformation of the South Tian Shan and the North Pamir. During deposition of the upper Atushi Formation, a larger proportion of North Pamir-derived sediments was deposited in the Wuheshalu section, maybe because faulting and northward propagation of the North Pamir caused northward displacement of the depocenter to north of the Wuheshalu section.…
Author details: | Xinwei Chen, Hanlin Chen, Edward SobelORCiDGND, Xiubin Lin, Xiaogan Cheng, Jiakai Yan, Shaomei Yang |
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DOI: | https://doi.org/10.1130/L1028.1 |
ISSN: | 1941-8264 |
ISSN: | 1947-4253 |
Title of parent work (English): | Lithosphere |
Subtitle (English): | Insights from provenance analysis in the Wuheshalu section at the convergence area |
Publisher: | American Institute of Physics |
Place of publishing: | Boulder |
Publication type: | Article |
Language: | English |
Year of first publication: | 2019 |
Publication year: | 2019 |
Release date: | 2020/12/08 |
Volume: | 11 |
Issue: | 4 |
Number of pages: | 17 |
First page: | 507 |
Last Page: | 523 |
Funding institution: | National Science Foundation of ChinaNational Natural Science Foundation of China [41330207, 41720104003, 41702205, 41472181, 41472182, 41402170]; National SandT Major Project [2017ZX05008-001, 2017ZX05003-001]; MOST of ChinaMinistry of Science and Technology, China [2016YFC0600402]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [2018FZA3008]; Open Fund of the Key Laboratory of Submarine Geosciences State Oceanic Administration |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
Peer review: | Referiert |
Publishing method: | Open Access / Gold Open-Access |
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