DOI: 10.1038/NGEO2418
论文题名: Anomalously fast convergence of India and Eurasia caused by double subduction
作者: Jagoutz O. ; Royden L. ; Holt A.F. ; Becker T.W.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 6 起始页码: 475
结束页码: 478
语种: 英语
Scopus关键词: collision zone
; Cretaceous
; numerical model
; plate convergence
; plate motion
; subduction
; tectonic setting
; Eurasia
; India
英文摘要: Before its collision with Eurasia1'5, the Indian Plate moved rapidly, at rates exceeding 140mmyr-1 for a period of 20 million years1,3'7. This motion is 50 to 100% faster than the maximum sustained rate of convergence of the main tectonic plates today8. The cause of such high rates of convergence is unclear and not reproduced by numerical models9,10. Here we show that existing geological data11,12 support the existence of two, almost parallel, northward dipping subduction zones between the Indian and Eurasian plates, during the Early Cretaceous period.We use a quantitative model to showthat the combined pull of two subducting slabs can generate anomalously rapid convergence between India and Eurasia. Furthermore, in our simulations a reduction in length of the southern subduction system, from about 10,000 to 3,000 km between 90 and 80 million years ago, reduced the viscous pressure between the subducting slabs and created a threefold increase in plate convergence rate between 80 and 65 million years ago. Rapid convergence ended 50 million years ago, when the Indian Plate collided with the southern subduction system. Collision of India with Eurasia and the northern subduction system had little effect on plate convergence rates before 40 million years ago. We conclude that the number and geometry of subduction systems has a strong influence on plate migration rates. © 2015 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106187
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States
Recommended Citation:
Jagoutz O.,Royden L.,Holt A.F.,et al. Anomalously fast convergence of India and Eurasia caused by double subduction[J]. Nature Geoscience,2015-01-01,8(6)