DOI: 10.1016/j.epsl.2018.03.011
Scopus记录号: 2-s2.0-85044057851
论文题名: Multiple episodes of fast exhumation since Cretaceous in southeast Tibet, revealed by low-temperature thermochronology
作者: Liu-Zeng J. ; Zhang J. ; McPhillips D. ; Reiners P. ; Wang W. ; Pik R. ; Zeng L. ; Hoke G. ; Xie K. ; Xiao P. ; Zheng D. ; Ge Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 490 起始页码: 62
结束页码: 76
语种: 英语
英文关键词: erosion rate
; exhumation
; low-temperature thermochronometry
; southeast Tibet
; Three Rivers region
Scopus关键词: Apatite
; Erosion
; Fission reactions
; Phosphate minerals
; Rivers
; Silicate minerals
; Tectonics
; Zircon
; Erosion rates
; exhumation
; southeast Tibet
; Thermochronometry
; Three Rivers region
; Temperature
; Cretaceous
; erosion rate
; exhumation
; incised valley
; low temperature
; spatiotemporal analysis
; thermochronology
; uplift
; China
; Lancang
; Qinghai-Xizang Plateau
; Weixi
; Yunnan
英文摘要: The southeast margin of the Tibetan plateau is characterized by deeply incised river valleys separated by a perched low relief landscape that gently descends from the high Tibetan plateau towards the southeast. When and how this unique landscape formed is debated. The onset of increased river incision is often interpreted as a proxy for the timing of surface uplift. Here, apatite and zircon (U–Th)/He and apatite fission track thermochronometries are employed to map the spatial and temporal pattern of exhumation in the region. Vertical profiles of granitic rocks were collected near Deqin (∼28.5°N) and Weixi (∼27.5°N). The two transects share a similar exhumation history, with two episodes of relatively fast exhumation (∼100–300 m/Myr) in the Cenozoic: during the Paleocene to Eocene (60–40 Ma) and Miocene to present (20–0 Ma), separated by an intervening period of slow exhumation. A pulse of moderate to high exhumation (70–300 m/Myr) during the mid- to late-Cretaceous (120–80 Ma) is also present in the data. However, the rate and total amount of exhumation near Deqin is larger than at Weixi and is especially pronounced in the interval between 20 Ma to present. We interpret this difference as possibly related to differences in erosion rates between the Lancang (Deqin) and the Jinsha (Weixi) rivers. The Paleocene to Eocene episode of fast exhumation is likely in response to early Cenozoic deformation along tectonic boundary structures, related to the transpressional collision of the Indian plate with this region. Pre-Miocene episodes of fast exhumation corroborate recent paleoaltimetric studies, which show that the southeast margin of the Tibetan plateau was elevated prior to the Oligocene. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109936
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, China; Syracuse University, Earth Sciences, Syracuse, NY, United States; Department of Geosciences, University of Arizona, United States; CRPG, Nancy, France; Institute of Geology, Chinese Geological Academy, China
Recommended Citation:
Liu-Zeng J.,Zhang J.,McPhillips D.,et al. Multiple episodes of fast exhumation since Cretaceous in southeast Tibet, revealed by low-temperature thermochronology[J]. Earth and Planetary Science Letters,2018-01-01,490