Indian plate paleogeography,subduction and horizontal underthrusting below Tibet:paradoxes,controversies and opportunities  

作　　者：Douwe J.J.van Hinsbergen 

机构地区：[1]Department of Earth Sciences,Utrecht University,Utrecht 3584 CB,Netherlands

出　　处：《National Science Review》2022年第8期170-188,共19页国家科学评论（英文版）

基　　金：supported by the Netherlands Organization for Scientific Research Vici grant 865.17.001。

摘　　要：The India-Asia collision zone is the archetype to calibrate geological responses to continent-continent collision,but hosts a paradox:there is no orogen-wide geological record of oceanic subduction after initial collision around 60-55 Ma,yet thousands of kilometers of post-collisional subduction occurred before the arrival of unsubductable continental lithosphere that currently horizontally underlies Tibet.Kinematically restoring incipient horizontal underthrusting accurately predicts geologically estimated diachronous slab break-off,unlocking the Miocene of Himalaya-Tibet as a natural laboratory for unsubductable lithosphere convergence.Additionally,three endmember paleogeographic scenarios exist with different predictions for the nature of post-collisional subducted lithosphere but each is defended and challenged based on similar data types.This paper attempts at breaking through this impasse by identifying how the three paleogeographic scenarios each challenge paradigms in geodynamics,orogenesis,magmatism or paleogeographic reconstruction and identify opportunities for methodological advances in paleomagnetism,sediment provenance analysis,and seismology to conclusively constrain Greater Indian paleogeography.

关 键 词：collision OROGENESIS SUBDUCTION reconstruction Himalaya TIBET 

分 类 号：P542[天文地球—构造地质学]