| DOI: | 10.1038/ngeo2852
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| 论文题名: | Metamorphic record of catastrophic pressure drops in subduction zones |
| 作者: | Yamato P.; Brun J.P.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2017
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| 卷: | 10, 期:1 | | 起始页码: | 46
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| 结束页码: | 50
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| 语种: | 英语
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| Scopus关键词: | burial (geology)
; catastrophic event
; compression
; exhumation
; high pressure
; metamorphic rock
; paragenesis
; pressure drop
; rheology
; rock mechanics
; seismicity
; subduction zone
; tectonic structure
; temperature effect
|
| 英文摘要: | When deeply buried in subduction zones, rocks undergo mineral transformations that record the increase of pressure and temperature. The fact that high-pressure metamorphic parageneses are found at the Earth's surface proves that rock burial is followed by exhumation. Here we use analysis of available data sets from high-pressure metamorphic rocks worldwide to show that the peak pressure is proportional to the subsequent decompression occurring during the initial stage of retrogression. We propose, using a simple mechanical analysis, that this linear relationship can be explained by the transition from burial-related compression to extension at the onset of exhumation. This major switch in orientation and magnitude of principal tectonic stresses leads to a catastrophic pressure drop prior to actual rock ascent. Therefore, peak pressures are not necessarily, as commonly believed, directly dependent on the maximum burial depth, but can also reflect a change of tectonic regime. Our results, which are in agreement with natural data, have significant implications for rock rheology, subduction zone seismicity, and the magnitudes of tectonic pressures sustained by rocks. Current views of subduction dynamics could be reconsidered in that perspective. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/105859
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| 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: | Géosciences Rennes, Université de Rennes 1, UMR 6118, Rennes Cedex, France
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| Recommended Citation: | |
Yamato P.,Brun J.P.. Metamorphic record of catastrophic pressure drops in subduction zones[J]. Nature Geoscience,2017-01-01,10(1)
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