气候变化领域集成服务门户(CCPortal): Fluid overpressure from chemical reactions in serpentinite within the source region of deep episodic tremor

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DOI	10.1038/s41561-019-0470-z
	Fluid overpressure from chemical reactions in serpentinite within the source region of deep episodic tremor
	Tarling M.S.; Smith S.A.F.; Scott J.M.
发表日期	2019
ISSN	17520894
卷号	12 期号:12
英文摘要	Slow fault slip includes a range of transient phenomena that occur over timescales longer than those of standard earthquakes. Slow slip events are often closely associated with swarms of tectonic tremor. Deep episodic tremor and slip close to the slab–mantle interface in subduction zones has been linked to high fluid pressures produced by dehydration of the subducting slab at greater depths. The slab–mantle interface is a fundamental chemical boundary, where mantle rocks are sheared and mixed with oceanic slab lithologies in a highly reactive environment to form serpentinite. Here we present field and microstructural observations from the plate boundary-scale crustal Livingstone Fault in New Zealand that suggest chemical reactions involving serpentinite can promote rock hardening and generate in situ fluid overpressures. We infer that these processes collectively can result in hydrofracturing and a transition from distributed creep to localized brittle failure and faulting. Serpentinite-related reactions occur over a wide range of pressure and temperature conditions that overlap with those in many forearc mantle wedges. We conclude that the release of fluids derived from such reactions may be an additional and widespread mechanism to generate high fluid pressure patches and brittle failure in the source region of deep tremor along the slab–mantle interface. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	chemical composition; fault slip; fluid composition; forearc basin; hardening; overpressure; serpentine; subduction zone; temperature profile; Livingstone; New Zealand; Southern Province [Zambia]; Zambia
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/124561
作者单位	Department of Geology, University of Otago, Dunedin, New Zealand
推荐引用方式 GB/T 7714	Tarling M.S.,Smith S.A.F.,Scott J.M.. Fluid overpressure from chemical reactions in serpentinite within the source region of deep episodic tremor[J],2019,12(12).
APA	Tarling M.S.,Smith S.A.F.,&Scott J.M..(2019).Fluid overpressure from chemical reactions in serpentinite within the source region of deep episodic tremor.Nature Geoscience,12(12).
MLA	Tarling M.S.,et al."Fluid overpressure from chemical reactions in serpentinite within the source region of deep episodic tremor".Nature Geoscience 12.12(2019).