DOI: 10.1016/j.earscirev.2020.103084
论文题名: Geological, geophysical and plate kinematic constraints for models of the India-Asia collision and the post-Triassic central Tethys oceans
作者: Parsons A.J. ; Hosseini K. ; Palin R.M. ; Sigloch K.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 208 语种: 英语
英文关键词: bedrock
; continental collision
; continental margin
; plate tectonics
; reconstruction
; slab
; subduction zone
; suture zone
; Tethys
; Triassic
; India
英文摘要: In this study, we integrate bedrock datasets, observations of subducted slabs in the mantle, and plate kinematic constraints to constrain models for the India-Asia collision and the central Tethys oceans. To accomplish this, we review: (1) the post-Triassic bedrock record of subduction in Tibet; (2) seismic tomographic imaging of subducted slabs in the mantle; (3) timing of the India-Asia collision; and (4) the pre-collisional size of Greater India. Following the assumption that slabs sink vertically through the mantle, their positions and geometries determined from seismic tomography constrain the locations and kinematics of paleo-subduction zones. Integrating this with bedrock constraints allows us to constrain post-Triassic subduction zone configurations for the central Tethys oceans. Neotethys was consumed by at least two subduction zones since the Jurassic. At the onset of the India-Asia collision at 59 ± 1 Ma, one subduction zone was active along the southern Asian continental margin at ~20°N. At that time, a second may have been active at subequatorial latitudes, but support for this from a bedrock perspective is lacking. This subduction zone configuration allows for three reconstructions for Greater India: The (1) minimum-area; (2) enlarged-area; and (3) Greater India Basin reconstructions. We integrate these reconstructions and subduction zone configurations in a plate kinematic framework to test their validity for the India-Asia collision. No single model is entirely satisfactory and each invokes assumptions that challenge accepted concepts. These include our understanding of suture zones, and the limits of continental subduction. We explore these challenges and their implications for our understanding of the India-Asia collision and continental collisions in general. © 2020 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166211
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401, United States
Recommended Citation:
Parsons A.J.,Hosseini K.,Palin R.M.,et al. Geological, geophysical and plate kinematic constraints for models of the India-Asia collision and the post-Triassic central Tethys oceans[J]. Earth Science Reviews,2020-01-01,208