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Gas hydrate versus seabed morphology offshore Lebu (Chilean margin)
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 analy...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7736863/ https://www.ncbi.nlm.nih.gov/pubmed/33318577 http://dx.doi.org/10.1038/s41598-020-78958-z |
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author | Vargas-Cordero, Iván Tinivella, Umberta Villar-Muñoz, Lucía Bento, Joaquim P. Cárcamo, Carolina López-Acevedo, Diego Fernandoy, Francisco Rivero, Alessandra Juan, Marion San |
author_facet | Vargas-Cordero, Iván Tinivella, Umberta Villar-Muñoz, Lucía Bento, Joaquim P. Cárcamo, Carolina López-Acevedo, Diego Fernandoy, Francisco Rivero, Alessandra Juan, Marion San |
author_sort | Vargas-Cordero, Iván |
collection | PubMed |
description | 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 δ(18)O (0.0–1.8‰) and δD (0.0–5.6‰) 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. |
format | Online Article Text |
id | pubmed-7736863 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-77368632020-12-15 Gas hydrate versus seabed morphology offshore Lebu (Chilean margin) Vargas-Cordero, Iván Tinivella, Umberta Villar-Muñoz, Lucía Bento, Joaquim P. Cárcamo, Carolina López-Acevedo, Diego Fernandoy, Francisco Rivero, Alessandra Juan, Marion San Sci Rep Article 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 δ(18)O (0.0–1.8‰) and δD (0.0–5.6‰) 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. Nature Publishing Group UK 2020-12-14 /pmc/articles/PMC7736863/ /pubmed/33318577 http://dx.doi.org/10.1038/s41598-020-78958-z Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Vargas-Cordero, Iván Tinivella, Umberta Villar-Muñoz, Lucía Bento, Joaquim P. Cárcamo, Carolina López-Acevedo, Diego Fernandoy, Francisco Rivero, Alessandra Juan, Marion San Gas hydrate versus seabed morphology offshore Lebu (Chilean margin) |
title | Gas hydrate versus seabed morphology offshore Lebu (Chilean margin) |
title_full | Gas hydrate versus seabed morphology offshore Lebu (Chilean margin) |
title_fullStr | Gas hydrate versus seabed morphology offshore Lebu (Chilean margin) |
title_full_unstemmed | Gas hydrate versus seabed morphology offshore Lebu (Chilean margin) |
title_short | Gas hydrate versus seabed morphology offshore Lebu (Chilean margin) |
title_sort | gas hydrate versus seabed morphology offshore lebu (chilean margin) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7736863/ https://www.ncbi.nlm.nih.gov/pubmed/33318577 http://dx.doi.org/10.1038/s41598-020-78958-z |
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