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DOI | 10.1038/NGEO2852 |
Metamorphic record of catastrophic pressure drops in subduction zones | |
Yamato, P.; Brun, J. P. | |
2017 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | France |
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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394117300013 |
WOS关键词 | INTERMEDIATE-DEPTH EARTHQUAKES ; TECTONIC OVERPRESSURE ; CONTINENT COLLISION ; ROCKS ; EXHUMATION ; CRUST ; MANTLE ; PSEUDOTACHYLYTES ; DEFORMATION ; CALEDONIDES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34959 |
专题 | 地球科学 气候变化 |
作者单位 | Univ Rennes 1, UMR 6118, Geosci Rennes, F-35042 Rennes, France |
推荐引用方式 GB/T 7714 | Yamato, P.,Brun, J. P.. Metamorphic record of catastrophic pressure drops in subduction zones[J]. NATURE GEOSCIENCE,2017,10(1). |
APA | Yamato, P.,&Brun, J. P..(2017).Metamorphic record of catastrophic pressure drops in subduction zones.NATURE GEOSCIENCE,10(1). |
MLA | Yamato, P.,et al."Metamorphic record of catastrophic pressure drops in subduction zones".NATURE GEOSCIENCE 10.1(2017). |
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