Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand

doi:10.1029/2020GL088474

IOCAS-IR

	Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand
	Cook, Ann E.1; Paganoni, Matteo 2,3; Clennell, Michael Benedict 4; McNamara, David D.5; Nole, Michael 6; Wang, Xiujuan 7; Han, Shuoshuo 8; Bell, Rebecca E.9; Solomon, Evan A.10; Saffer, Demian M.8; Barnes, Philip M.11; Pecher, Ingo A.12; Wallace, Laura M.13; LeVay, Leah J.14; Petronotis, Katerina E.14
	2020-08-28
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
卷号	47 期号:16 页码:11
通讯作者	Cook, Ann E.([email protected])
摘要	The Papaku Fault Zone, drilled at International Ocean Discovery Program (IODP) Site U1518, is an active splay fault in the frontal accretionary wedge of the Hikurangi Margin. In logging-while-drilling data, the 33-m-thick fault zone exhibits mixed modes of deformation associated with a trend of downward decreasing density, P-wave velocity, and resistivity. Methane hydrate is observed from similar to 30 to 585 m below seafloor (mbsf), including within and surrounding the fault zone. Hydrate accumulations are vertically discontinuous and occur throughout the entire logged section at low to moderate saturation in silty and sandy centimeter-thick layers. We argue that the hydrate distribution implies that the methane is not sourced from fluid flow along the fault but instead by local diffusion. This, combined with geophysical observations and geochemical measurements from Site U1518, suggests that the fault is not a focused migration pathway for deeply sourced fluids and that the near-seafloor Papaku Fault Zone has little to no active fluid flow. Plain Language Summary Faults are boundaries in the Earth where two different blocks of sediment or rock slide past each other. Offshore New Zealand, the Papaku Fault is very shallow and intersects the seafloor but connects to deeper faults kilometers below the seafloor where large earthquakes can occur. An ice-like form of methane called hydrate also occurs within and surrounding the fault. We use scientific drilling data to understand the physical properties of the fault. Hydrate can affect fault properties and how fluid flows; however, based on the pattern of hydrate distribution and other geochemical and geophysical measurements, we suggest that the Papaku Fault does not have active fluid flow.
DOI	10.1029/2020GL088474
收录类别	SCI
语种	英语
资助项目	National Science Foundation (NSF)[1752882]; Natural Environment Research Council (NERC)[NE/R016615/1]; NERC grant[NE/S00291X/1]; National Natural Science Foundation of China[41976077]; Geological Survey Ireland; New Zealand Endeavour Fund[CO5X1605]; NIWA; GNS SSIF; IODP-JRSO NSF award[1326927]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000566245300029
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/168487
专题	中国科学院海洋研究所
通讯作者	Cook, Ann E.
作者单位	1.Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA 2.Univ Oxford, Dept Earth Sci, Oxford, England 3.Shell Int Global Solut, Rijswijk, Netherlands 4.CSIRO, Kensington, WA, Australia 5.Univ Liverpool, Earth Ocean & Ecol Sci, Liverpool, Merseyside, England 6.Sandia Natl Labs, Ctr Energy & Earth Syst, POB 5800, Albuquerque, NM 87185 USA 7.Chinese Acad Sci, Inst Oceanog, Qingdao, Peoples R China 8.Univ Texas Austin, Inst Geophys, Austin, TX USA 9.Imperial Coll London, Basins Res Grp, London, England 10.Univ Washington, Sch Oceanog, Seattle, WA 98195 USA 11.Natl Inst Water & Atmospher Res NIWA, Wellington, New Zealand 12.Univ Auckland, Sch Environm & Marine Sci, Auckland, New Zealand 13.GNS Sci, Lower Hutt, New Zealand 14.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX USA
推荐引用方式 GB/T 7714	Cook, Ann E.,Paganoni, Matteo,Clennell, Michael Benedict,et al. Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(16):11.
APA	Cook, Ann E..,Paganoni, Matteo.,Clennell, Michael Benedict.,McNamara, David D..,Nole, Michael.,...&Petronotis, Katerina E..(2020).Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand.GEOPHYSICAL RESEARCH LETTERS,47(16),11.
MLA	Cook, Ann E.,et al."Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand".GEOPHYSICAL RESEARCH LETTERS 47.16(2020):11.

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