DOI: 10.1016/j.epsl.2020.116144
论文题名: Does pulsed Tibetan deformation correlate with Indian plate motion changes?
作者: Li S. ; van Hinsbergen D.J.J. ; Najman Y. ; Liu-Zeng J. ; Deng C. ; Zhu R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 536 语种: 英语
中文关键词: convergence rate
; India-Asia collision
; magnetostratigraphy
; paleomagnetism
; Tibetan Plateau
英文关键词: Deformation
; Geomagnetism
; Sedimentology
; Convergence rates
; India-Asia collision
; Magnetostratigraphy
; paleomagnetism
; Tibetan Plateau
; Plates (structural components)
; collision zone
; crustal shortening
; deformation
; magnetostratigraphy
; paleomagnetism
; plate convergence
; plate motion
; China
; Gonjo Basin
; Qinghai-Xizang Plateau
; Xizang
英文摘要: Models that aim to explain the causes of the significant Indian plate motion acceleration around 70 Ma, and the subsequent deceleration around 52 Ma predict different scenarios regarding crustal shortening of the Tibetan Plateau, which can be tested by precisely determining the timing of regional shortening events in Tibet. Here we attempt to determine this timing by presenting a high-resolution magnetostratigraphy of a ∼3.5 km thick sedimentary sequence in the syn-contractional Gonjo Basin, east-central Tibet. We successfully isolated the primary remanence as confirmed by positive fold and reversal tests. Correlation to the geomagnetic polarity time scale reveals a 69–41.5 Ma age for the Gonjo Basin sedimentary succession. Average sedimentation rates indicate two episodes of enhanced sediment accumulation rate at 69–64 Ma and 52–48 Ma, which coincide with periods of vertical axis rotation recorded in the basin fill. This coincidence suggests a tectonic cause, which given regional structures we interpret as shortening pulses. Our results are similar to those from basins elsewhere in southern, central and northern Tibet, suggesting plateau-wide, synchronous shortening pulses at ∼69–64 Ma and ∼52–48 Ma. These pulses are synchronous with major acceleration and deceleration of India-Asia convergence rate, suggesting that both the acceleration and deceleration of India-Asia convergence may be associated with enhanced crustal deformation in Tibet, which we use to evaluate previous dynamic models explaining the Indian plate motion changes and India-Asia collision processes. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165103
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, 100029, China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation:
Li S.,van Hinsbergen D.J.J.,Najman Y.,et al. Does pulsed Tibetan deformation correlate with Indian plate motion changes?[J]. Earth and Planetary Science Letters,2020-01-01,536