气候变化领域集成服务门户(CCPortal): Evolution and demise of passive margins through grain mixing and damage

CCPortal

DOI	10.1073/pnas.2011247118
	Evolution and demise of passive margins through grain mixing and damage
	Bercovici D.; Mulyukova E.
发表日期	2021
ISSN	00278424
卷号	118 期号:4
英文摘要	How subduction—the sinking of cold lithospheric plates into the mantle—is initiated is one of the key mysteries in understanding why Earth has plate tectonics. One of the favored locations for subduction triggering is at passive margins, where sea floor abuts continental margins. Such passive margin collapse is problematic because the strength of the old, cold ocean lithosphere should prohibit it from bending under its own weight and sinking into the mantle. Some means of mechanical weakening of the passive margin are therefore necessary. Spontaneous and accumulated grain damage can allow for considerable lithospheric weakening and facilitate passive margin collapse. Grain damage is enhanced where mixing between mineral phases in lithospheric rocks occurs. Such mixing is driven both by compositional gradients associated with petrological heterogeneity and by the state of stress in the lithosphere. With lateral compressive stress imposed by ridge push in an opening ocean basin, bands of mixing and weakening can develop, become vertically oriented, and occupy a large portion of lithosphere after about 100 million y. These bands lead to anisotropic viscosity in the lithosphere that is strong to lateral forcing but weak to bending and sinking, thereby greatly facilitating passive margin collapse. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Grain damage; Passive margins; Subduction
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180875
作者单位	Department of Earth & Planetary Sciences, Yale University, New Haven, CT 06511, United States
推荐引用方式 GB/T 7714	Bercovici D.,Mulyukova E.. Evolution and demise of passive margins through grain mixing and damage[J],2021,118(4).
APA	Bercovici D.,&Mulyukova E..(2021).Evolution and demise of passive margins through grain mixing and damage.Proceedings of the National Academy of Sciences of the United States of America,118(4).
MLA	Bercovici D.,et al."Evolution and demise of passive margins through grain mixing and damage".Proceedings of the National Academy of Sciences of the United States of America 118.4(2021).