Post-ridge-subduction acceleration of the Indian plate induced by slab rollback
The driving forces of plate motion, especially that of its sudden change over time, has long been debated. During the closure of an old ocean, the subduction process of the mid-ocean ridge provides valuable clues to quantitative evaluation of the driving forces of plate tectonics. Here we show that...
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doaj-88fefa87f56f4f0c9dd3a7c410799e8b2020-11-24T22:26:22ZengElsevierSolid Earth Sciences2451-912X2018-03-01311710.1016/j.sesci.2017.12.003Post-ridge-subduction acceleration of the Indian plate induced by slab rollbackWei-dong Sun0Li-jun Liu1Yong-bing Hu2Wei Ding3Ji-qiang Liu4Ming-xing Ling5Xing Ding6Zhao-feng Zhang7Xin-lei Sun8Cong-ying Li9He Li10Wei-ming Fan11Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, ChinaDepartment of Geology, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USAKey Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaUniversity of the Chinese Academy of Sciences, Beijing 100049, ChinaUniversity of the Chinese Academy of Sciences, Beijing 100049, ChinaCAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, ChinaCAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, ChinaUniversity of the Chinese Academy of Sciences, Beijing 100049, ChinaUniversity of the Chinese Academy of Sciences, Beijing 100049, ChinaCenter of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, ChinaCenter of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, ChinaCAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, ChinaThe driving forces of plate motion, especially that of its sudden change over time, has long been debated. During the closure of an old ocean, the subduction process of the mid-ocean ridge provides valuable clues to quantitative evaluation of the driving forces of plate tectonics. Here we show that the drifting rates of the Indian plate were correlated with a Late Cretaceous adakitic event hosting abundant adakites and adakitic charnockites in the Gangdese belt, southern Tibetan Plateau. While adakites form through slab melting, the ultra-high temperatures and dry nature of charnockites indicate major disturbance of the hot asthenosphere. Temporally, the oldest adakite corresponds to the initiation of the ridge subduction, whereas the youngest adakitic charnockite marks the onset of post-ridge-subduction slab rollback (steepening). Geodynamic modeling suggests that the initiation of the ridge subduction was facilitated by the Morondova mantle plume, corresponding to the lowest drifting rate of the Indian plate. Our analyses further show that the post-ridge-subduction slab rollback pushed the asthenospheric mantle backward, meanwhile it dramatically reduced the ridge-arc interaction force, leading to the first abrupt acceleration of the Indian plate. Slab rollback contributed ∼3.5 cm/yr but lasted for only ∼5 Ma, while slab pull, ridge push together with plume contributed ∼5 cm/yr to the acceleration of the Indian plate. Our study, therefore, provides evidence for a new type of driving forces of Indian plate acceleration during the Late Cretaceous Neotethys ridge subduction.http://www.sciencedirect.com/science/article/pii/S2451912X17300715Ridge subductionSlab rollbackAdakiteTibetDriving force |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Wei-dong Sun Li-jun Liu Yong-bing Hu Wei Ding Ji-qiang Liu Ming-xing Ling Xing Ding Zhao-feng Zhang Xin-lei Sun Cong-ying Li He Li Wei-ming Fan |
spellingShingle |
Wei-dong Sun Li-jun Liu Yong-bing Hu Wei Ding Ji-qiang Liu Ming-xing Ling Xing Ding Zhao-feng Zhang Xin-lei Sun Cong-ying Li He Li Wei-ming Fan Post-ridge-subduction acceleration of the Indian plate induced by slab rollback Solid Earth Sciences Ridge subduction Slab rollback Adakite Tibet Driving force |
author_facet |
Wei-dong Sun Li-jun Liu Yong-bing Hu Wei Ding Ji-qiang Liu Ming-xing Ling Xing Ding Zhao-feng Zhang Xin-lei Sun Cong-ying Li He Li Wei-ming Fan |
author_sort |
Wei-dong Sun |
title |
Post-ridge-subduction acceleration of the Indian plate induced by slab rollback |
title_short |
Post-ridge-subduction acceleration of the Indian plate induced by slab rollback |
title_full |
Post-ridge-subduction acceleration of the Indian plate induced by slab rollback |
title_fullStr |
Post-ridge-subduction acceleration of the Indian plate induced by slab rollback |
title_full_unstemmed |
Post-ridge-subduction acceleration of the Indian plate induced by slab rollback |
title_sort |
post-ridge-subduction acceleration of the indian plate induced by slab rollback |
publisher |
Elsevier |
series |
Solid Earth Sciences |
issn |
2451-912X |
publishDate |
2018-03-01 |
description |
The driving forces of plate motion, especially that of its sudden change over time, has long been debated. During the closure of an old ocean, the subduction process of the mid-ocean ridge provides valuable clues to quantitative evaluation of the driving forces of plate tectonics. Here we show that the drifting rates of the Indian plate were correlated with a Late Cretaceous adakitic event hosting abundant adakites and adakitic charnockites in the Gangdese belt, southern Tibetan Plateau. While adakites form through slab melting, the ultra-high temperatures and dry nature of charnockites indicate major disturbance of the hot asthenosphere. Temporally, the oldest adakite corresponds to the initiation of the ridge subduction, whereas the youngest adakitic charnockite marks the onset of post-ridge-subduction slab rollback (steepening). Geodynamic modeling suggests that the initiation of the ridge subduction was facilitated by the Morondova mantle plume, corresponding to the lowest drifting rate of the Indian plate. Our analyses further show that the post-ridge-subduction slab rollback pushed the asthenospheric mantle backward, meanwhile it dramatically reduced the ridge-arc interaction force, leading to the first abrupt acceleration of the Indian plate. Slab rollback contributed ∼3.5 cm/yr but lasted for only ∼5 Ma, while slab pull, ridge push together with plume contributed ∼5 cm/yr to the acceleration of the Indian plate. Our study, therefore, provides evidence for a new type of driving forces of Indian plate acceleration during the Late Cretaceous Neotethys ridge subduction. |
topic |
Ridge subduction Slab rollback Adakite Tibet Driving force |
url |
http://www.sciencedirect.com/science/article/pii/S2451912X17300715 |
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