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

Ann E. Cook, Matteo Paganoni, Michael Benedict Clennell, David D. McNamara, Michael Nole, Xiujuan Wang, Shuoshuo Han, Rebecca E. Bell, Evan A. Solomon, Demian M. Saffer, Philip M. Barnes, Ingo A. Pecher, Laura M. Wallace, Leah J. LeVay, Katerina E. Petronotis

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.

Original languageEnglish (US)
Article numbere2020GL088474
JournalGeophysical Research Letters
Volume47
Issue number16
DOIs
StatePublished - Aug 28 2020

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Physical Properties and Gas Hydrate at a Near-Seafloor Thrust Fault, Hikurangi Margin, New Zealand'. Together they form a unique fingerprint.

Cite this