Glacial cycles influence marine methane hydrate formation
Journal Article
·
· Geophysical Research Letters
- Columbia Univ., New York, NY (United States); The University of Texas at Austin
- The Ohio State Univ., Columbus, OH (United States)
- Univ. of Texas at Austin, Austin, TX (United States)
- Columbia Univ., New York, NY (United States)
Methane hydrates in fine-grained continental slope sediments often occupy isolated depth intervals surrounded by hydrate-free sediments. As they are not connected to deep gas sources, these hydrate deposits have been interpreted as sourced by in situ microbial methane. We investigate here the hypothesis that these isolated hydrate accumulations form preferentially in sediments deposited during Pleistocene glacial lowstands that contain relatively large amounts of labile particulate organic carbon, leading to enhanced microbial methanogenesis. To test this hypothesis, we apply an advection-diffusion-reaction model with a time-dependent organic carbon deposition controlled by glacioeustatic sea level variations. In the model, hydrate forms in sediments with greater organic carbon content deposited during the penultimate glacial cycle (~120-240 ka). As a result, the model predictions match hydrate-bearing intervals detected in three sites drilled on the northern Gulf of Mexico continental slope, supporting the hypothesis of hydrate formation driven by enhanced organic carbon burial during glacial lowstands.
- Research Organization:
- Univ. of Texas at Austin, Austin, TX (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- FE0013919; FE0023919
- OSTI ID:
- 1417464
- Alternate ID(s):
- OSTI ID: 1418410
- Journal Information:
- Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 2 Vol. 45; ISSN 0094-8276
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Mechanisms of Methane Hydrate Formation in Geological Systems
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journal | October 2019 |
Sedimentation Controls on Methane‐Hydrate Dynamics Across Glacial/Interglacial Stages: An Example From International Ocean Discovery Program Site U1517, Hikurangi Margin
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journal | November 2019 |
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