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Title: A Fluid Pulse on the Hikurangi Subduction Margin: Evidence From a Heat Flux Transect Across the Upper Limit of Gas Hydrate Stability: Fluid Pulse on the Hikurangi Margin

Abstract

A transect of seafloor heat probe measurements on the Hikurangi Margin shows a significant increase of thermal gradients upslope of the updip limit of gas hydrate stability at the seafloor. We interpret these anomalously high thermal gradients as evidence for a fluid pulse leading to advective heat flux, while endothermic cooling from gas hydrate dissociation depresses temperatures in the hydrate stability field. Previous studies predict a seamount on the subducting Pacific Plate to cause significant overpressure beneath our study area, which may be the source of the fluid pulse. Double-bottom simulating reflections are present in our study area and likely caused by uplift based on gas hydrate phase boundary considerations, although we cannot exclude a thermogenic origin. We suggest that uplift may be associated with the leading edge of the subducting seamount. Our results provide further evidence for the transient nature of fluid expulsion in subduction zones.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [2];  [5];  [3];  [6];  [6]
  1. Univ. of Auckland (New Zealand)
  2. Univ. of Bremen (Germany)
  3. GNS Science, Wellington (New Zealand)
  4. NIWA, Wellington (New Zealand)
  5. Univ. of Jena (Germany)
  6. Texas A & M Univ., Corpus Christi, TX (United States)
Publication Date:
Research Org.:
Praxair, Inc., Danbury, CT (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1537306
Alternate Identifier(s):
OSTI ID: 1415236
Grant/Contract Number:  
FE0026163
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 24; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geology

Citation Formats

Pecher, I. A., Villinger, H., Kaul, N., Crutchley, G. J., Mountjoy, J. J., Huhn, K., Kukowski, N., Henrys, S. A., Rose, P. S., and Coffin, R. B. A Fluid Pulse on the Hikurangi Subduction Margin: Evidence From a Heat Flux Transect Across the Upper Limit of Gas Hydrate Stability: Fluid Pulse on the Hikurangi Margin. United States: N. p., 2017. Web. doi:10.1002/2017gl076368.
Pecher, I. A., Villinger, H., Kaul, N., Crutchley, G. J., Mountjoy, J. J., Huhn, K., Kukowski, N., Henrys, S. A., Rose, P. S., & Coffin, R. B. A Fluid Pulse on the Hikurangi Subduction Margin: Evidence From a Heat Flux Transect Across the Upper Limit of Gas Hydrate Stability: Fluid Pulse on the Hikurangi Margin. United States. doi:10.1002/2017gl076368.
Pecher, I. A., Villinger, H., Kaul, N., Crutchley, G. J., Mountjoy, J. J., Huhn, K., Kukowski, N., Henrys, S. A., Rose, P. S., and Coffin, R. B. Thu . "A Fluid Pulse on the Hikurangi Subduction Margin: Evidence From a Heat Flux Transect Across the Upper Limit of Gas Hydrate Stability: Fluid Pulse on the Hikurangi Margin". United States. doi:10.1002/2017gl076368. https://www.osti.gov/servlets/purl/1537306.
@article{osti_1537306,
title = {A Fluid Pulse on the Hikurangi Subduction Margin: Evidence From a Heat Flux Transect Across the Upper Limit of Gas Hydrate Stability: Fluid Pulse on the Hikurangi Margin},
author = {Pecher, I. A. and Villinger, H. and Kaul, N. and Crutchley, G. J. and Mountjoy, J. J. and Huhn, K. and Kukowski, N. and Henrys, S. A. and Rose, P. S. and Coffin, R. B.},
abstractNote = {A transect of seafloor heat probe measurements on the Hikurangi Margin shows a significant increase of thermal gradients upslope of the updip limit of gas hydrate stability at the seafloor. We interpret these anomalously high thermal gradients as evidence for a fluid pulse leading to advective heat flux, while endothermic cooling from gas hydrate dissociation depresses temperatures in the hydrate stability field. Previous studies predict a seamount on the subducting Pacific Plate to cause significant overpressure beneath our study area, which may be the source of the fluid pulse. Double-bottom simulating reflections are present in our study area and likely caused by uplift based on gas hydrate phase boundary considerations, although we cannot exclude a thermogenic origin. We suggest that uplift may be associated with the leading edge of the subducting seamount. Our results provide further evidence for the transient nature of fluid expulsion in subduction zones.},
doi = {10.1002/2017gl076368},
journal = {Geophysical Research Letters},
number = 24,
volume = 44,
place = {United States},
year = {2017},
month = {12}
}

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