Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand
Abstract
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 ~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. In this paper, 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.
- Authors:
-
[1];
[2];
[3];
[4];
[5];
[6];
[7];
[11];
[12];
[13];
[13]
- The Ohio State Univ., Columbus, OH (United States)
- Univ. of Oxford (United Kingdom)
- Commonwealth Scientific and Industrial Research Organization (CSIRO), Kensington WA (Australia)
- Univ. of Liverpool (United Kingdom)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Chinese Academy of Sciences (CAS), Qingdao (China)
- Univ. of Texas, Austin, TX (United States)
- Imperial College, London (United Kingdom)
- Univ. of Washington, Seattle, WA (United States)
- National Institute of Water and Atmospheric Research (NIWA), Wellington (New Zealand)
- School of Environmental and Marine SciencesUniversity of Auckland Auckland New Zealand
- GNS Science Lower Hutt New Zealand
- Texas A & M Univ., College Station, TX (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); North American Electric Reliability Corporation (NERC); National Natural Science Foundation of China (NSFC); New Zealand Endeavour Fund
- OSTI Identifier:
- 1650156
- Report Number(s):
- SAND-2020-8182J
Journal ID: ISSN 0094-8276; 689805
- Grant/Contract Number:
- AC04-94AL85000; 1752882; NE/R016615/1; NE/S00291X/1; 41976077; CO5X1605; 1326927
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 47; Journal Issue: 16; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; accretionary wedge; fault; gas hydrate; Hikurangi Margin
Citation Formats
Cook, Ann E., Paganoni, Matteo, Clennell, Michael Benedict, McNamara, David D., Nole, Michael, Wang, Xiujuan, Han, Shuoshuo, Bell, Rebecca E., Solomon, Evan A., Saffer, Demian M., Barnes, Philip M., Pecher, Ingo A., Wallace, Laura M., LeVay, Leah J., and Petronotis, Katerina E. Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand. United States: N. p., 2020.
Web. doi:10.1029/2020gl088474.
Cook, Ann E., Paganoni, Matteo, Clennell, Michael Benedict, McNamara, David D., Nole, Michael, Wang, Xiujuan, Han, Shuoshuo, Bell, Rebecca E., Solomon, Evan A., Saffer, Demian M., Barnes, Philip M., Pecher, Ingo A., Wallace, Laura M., LeVay, Leah J., & Petronotis, Katerina E. Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand. United States. https://doi.org/10.1029/2020gl088474
Cook, Ann E., Paganoni, Matteo, Clennell, Michael Benedict, McNamara, David D., Nole, Michael, Wang, Xiujuan, Han, Shuoshuo, Bell, Rebecca E., Solomon, Evan A., Saffer, Demian M., Barnes, Philip M., Pecher, Ingo A., Wallace, Laura M., LeVay, Leah J., and Petronotis, Katerina E. Tue .
"Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand". United States. https://doi.org/10.1029/2020gl088474. https://www.osti.gov/servlets/purl/1650156.
@article{osti_1650156,
title = {Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand},
author = {Cook, Ann E. and Paganoni, Matteo and Clennell, Michael Benedict and McNamara, David D. and Nole, Michael and Wang, Xiujuan and Han, Shuoshuo and Bell, Rebecca E. and Solomon, Evan A. and Saffer, Demian M. and Barnes, Philip M. and Pecher, Ingo A. and Wallace, Laura M. and LeVay, Leah J. and Petronotis, Katerina E.},
abstractNote = {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 ~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. In this paper, 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.},
doi = {10.1029/2020gl088474},
journal = {Geophysical Research Letters},
number = 16,
volume = 47,
place = {United States},
year = {Tue Aug 04 00:00:00 EDT 2020},
month = {Tue Aug 04 00:00:00 EDT 2020}
}
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