Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand
Cook, Ann E.1; Paganoni, Matteo2,3; Clennell, Michael Benedict4; McNamara, David D.5; Nole, Michael6; Wang, Xiujuan7; Han, Shuoshuo8; 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
Corresponding AuthorCook, Ann E.(
AbstractThe 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.
Indexed BySCI
Funding ProjectNational 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 Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000566245300029
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorCook, Ann E.
Affiliation1.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
Recommended Citation
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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