DOI: 10.1016/j.epsl.2019.115955
论文题名: Early Pleistocene drainage pattern changes in Eastern Tibet: Constraints from provenance analysis, thermochronometry, and numerical modeling
作者: Yang R. ; Suhail H.A. ; Gourbet L. ; Willett S.D. ; Fellin M.G. ; Lin X. ; Gong J. ; Wei X. ; Maden C. ; Jiao R. ; Chen H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531 语种: 英语
中文关键词: eastern Tibet
; numerical modeling
; provenance analysis
; river analysis
; river capture
; thermochronometry
英文关键词: Binary alloys
; Geochronology
; Lead alloys
; Rivers
; Sediments
; Silicate minerals
; Strike-slip faults
; Thorium alloys
; Uranium alloys
; Zircon
; Drainage patterns
; Early pleistocene
; eastern Tibet
; Landscape development
; Pliocene sediments
; Provenance analysis
; Thermochronometry
; Topographic analysis
; Numerical models
英文摘要: The geometry and evolution of fluvial systems are thought to be related to surface uplift. In eastern Tibet, rivers exhibit peculiar drainage patterns but how these patterns were established and their connection with the plateau uplift are still under debate. Here, we use detrital zircon U-Pb dating, bedrock (U-Th)/He thermochronometry, topographic analysis and numerical modeling to explore the paleo-drainage pattern of the Dadu and Anning Rivers, eastern Tibet. Our detrital data indicate that the Pliocene sources of sediments to the Anning River are different from the modern ones and they include a source similar to that of the modern Dadu River, implying a paleo-connection between the Dadu and the Anning Rivers and a subsequent cutoff of this connection after the deposition of the Pliocene sediments. Bedrock thermochronometric data along the Dadu River reveal rapid cooling at ∼10 Ma and a possible enhanced cooling at ∼2 Ma, which we interpret as a response to the regional plateau uplift in eastern Tibet and to the Dadu-Anning capture, respectively. Combined with topographic analysis and numerical modeling, our results indicate an Early Pleistocene capture between the Dadu and Anning Rivers, resulting in the changes in the sediment sources of the Anning River, enhanced incision of the Dadu, and the transience of the Dadu River profile. The Dadu-Anning capture is related to the motion along the active sinistral strike-slip Daliangshan fault that locally disrupts the river network. This event does not date the plateau uplift; rather, it indicates how river reorganization can effectively enhance river incision and affect landscape development independently from regional-scale uplift. © 2019 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165363
Appears in Collections: 气候变化与战略
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作者单位: School of Earth Sciences, Zhejiang University, Hangzhou, 310027, China; Department of Earth Sciences, ETH Zürich, Zürich, 8092, Switzerland; Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, 14473, Germany
Recommended Citation:
Yang R.,Suhail H.A.,Gourbet L.,et al. Early Pleistocene drainage pattern changes in Eastern Tibet: Constraints from provenance analysis, thermochronometry, and numerical modeling[J]. Earth and Planetary Science Letters,2020-01-01,531