气候变化领域集成服务门户(CCPortal): Deep hydration and lithospheric thinning at oceanic transform plate boundaries

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DOI	10.1038/s41561-022-01003-3
	Deep hydration and lithospheric thinning at oceanic transform plate boundaries
	Wang, Zhikai; Singh, Satish C.; Prigent, Cecile; Gregory, Emma P. M.; Marjanovic, Milena
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	741
结束页码	+
卷号	15 期号:9 页码:20
英文摘要	Transform faults accommodate the lateral motions between lithospheric plates, producing large earthquakes. Away from active transform boundaries, former oceanic transform faults also form the fracture zones that cover the ocean floor. However, the deep structure of these faults remains enigmatic. Here we present ultra-long offset seismic data from the Romanche transform fault in the equatorial Atlantic Ocean that indicates the presence of a low-velocity anomaly extending to similar to 60 km below sea level. We performed three-dimensional thermal modelling that suggests the anomaly is probably due to extensive serpentinization down to similar to 16 km, overlying a hydrated, shear mylonite zone down to 32 km. The water is considered to be sourced from seawater-derived fluids that infiltrate deep into the fault. Below 32 km is interpreted to be a low-temperature, water-induced melting zone that elevates the lithosphere-asthenosphere boundary, causing substantial thinning of the lithosphere at the transform fault. The presence of a thinned lithosphere at transform faults could explain observations of volcanism, thickened crust and intra-transform spreading centres at transform faults. It also suggests that migration and mixing of water-induced melt with the high-temperature melt may occur beneath the ridge axis.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000844596800001
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272596
作者单位	Centre National de la Recherche Scientifique (CNRS); UDICE-French Research Universities; Universite Paris Cite
推荐引用方式 GB/T 7714	Wang, Zhikai,Singh, Satish C.,Prigent, Cecile,et al. Deep hydration and lithospheric thinning at oceanic transform plate boundaries[J],2022,15(9):20.
APA	Wang, Zhikai,Singh, Satish C.,Prigent, Cecile,Gregory, Emma P. M.,&Marjanovic, Milena.(2022).Deep hydration and lithospheric thinning at oceanic transform plate boundaries.NATURE GEOSCIENCE,15(9),20.
MLA	Wang, Zhikai,et al."Deep hydration and lithospheric thinning at oceanic transform plate boundaries".NATURE GEOSCIENCE 15.9(2022):20.