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Gas hydrate versus seabed morphology offshore Lebu (Chilean margin)
Iván Vargas-Cordero1, Umberta Tinivella2, Lucía Villar-Muñoz3,4
1, Valparaiso, Chile. lacruzvargas@gmail.com.
Scientific Reports
|December 15, 2020
Summary
Offshore Lebu, mud cones indicate past gas hydrate melting and fluid escape. This Chilean margin area is ideal for studying these geological processes.
Area of Science:
- Marine geology
- Geochemistry
- Geophysics
Background:
- Gas hydrate occurrences are known along the Chilean margin.
- Processes of fluid escape from dissociating gas hydrates remain poorly understood.
Purpose of the Study:
- To investigate seabed morphology linked to fluid migration offshore Lebu.
- To understand the role of gas hydrate dissociation in mud cone formation.
Main Methods:
- Analysis of oxygen and deuterium stable water isotopes in pore water.
- Examination of bathymetric, biological (benthic foraminifera), and sedimentological data.
- Integration with seismic data analysis.
Main Results:
- A seabed relief with five peaks was identified at -127 m water depth.
- Isotope enrichments (δ18O: 0.0-1.8‰, δD: 0.0-5.6‰) indicate past gas hydrate melting.
- Mud cones are modeled as resulting from fluid growth processes linked to gas hydrate dissociation.
Conclusions:
- The studied relief's orientation suggests fluid migration through faults and fractures.
- Benthic foraminifera and sediment data support association with cold seep environments.
- The area shows evidence of past gas hydrate presence and is suitable for fluid migration studies.
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