Cook, Ann E, Paganoni, Matteo, Clennell, Michael Benedict, McNamara, David D 
ORCID: 0000-0001-9789-2436, Nole, Michael, Wang, Xiujuan, Han, Shuoshuo, Bell, Rebecca E, Solomon, Evan A, Saffer, Demian M et al (show 5 more authors)
(2020)
Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand
Geophysical Research Letters, 47 (16).
ISSN 0094-8276, 1944-8007
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FaultPaper_cleancopy.pdf - Author Accepted Manuscript Download (1MB) | Preview |
Abstract
The Pāpaku 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 ~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 Pāpaku Fault Zone has little to no active fluid flow.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 37 Earth Sciences, 3703 Geochemistry, 3705 Geology, 3706 Geophysics |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 29 Sep 2020 07:37 |
| Last Modified: | 24 Jan 2026 02:39 |
| DOI: | 10.1029/2020GL088474 |
| Related Websites: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3102872 |
| Disclaimer: | The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate. |
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