Gas hydrate versus seabed morphology offshore Lebu (Chilean margin)
Author
dc.contributor.author
Vargas Cordero, Iván
Author
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Tinivella, Umberta
Author
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Villar Muñoz, Lucía
Author
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Bento, Joaquim P.
Author
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Cárcamo, Carolina
Author
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López Acevedo, Diego
Author
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Fernandoy, Francisco
Author
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Rivero, Alessandra
Author
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San Juan, Marión
Admission date
dc.date.accessioned
2021-06-29T15:31:52Z
Available date
dc.date.available
2021-06-29T15:31:52Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
Scientifc Reports (2020) 10:21928
es_ES
Identifier
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10.1038/s41598-020-78958-z
Identifier
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https://repositorio.uchile.cl/handle/2250/180308
Abstract
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Gas-hydrate occurrences along the Chilean margin have been widely documented, but the processes associated with fluid escapes caused by the dissociation of gas hydrates are still unknown. We report a seabed morphology growth related to fluid migration offshore Lebu associated with mud cones by analysing oxygen and deuterium stable water isotopes in pore water, bathymetric, biological and sedimentological data. A relief was observed at - 127 m water depth with five peaks. Enrichment values of delta O-18 (0.0-1.8 parts per thousand) and delta D (0.0-5.6 parts per thousand) evidenced past hydrate melting. The orientation of the relief could be associated with faults and fractures, which constitute pathways for fluid migration. The benthic foraminifera observed can be associated with cold seep areas. We model that the mud cones correspond to mud growing processes related to past gas-hydrate dissociation. The integration of (i) the seismic data analysis performed in the surrounding area, (ii) the orientation of our studied relief, (iii) the infaunal foraminifera observed, (iv) the grain size and (v) the total organic matter and isotope values revealed that this area was formerly characterised by the presence of gas hydrates. Hence, this part of the Chilean margin represents a suitable area for investigating fluid-migration processes.
es_ES
Patrocinador
dc.description.sponsorship
Ministry of Education, Universities and Research (MIUR)
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