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Gas origin linked to paleo BSR

The Central-South Chile margin is an excellent site to address the changes in the gas hydrate system since the last deglaciation associated with tectonic uplift and great earthquakes. However, the dynamic of the gas hydrate/free gas system along south central Chile is currently not well understood....

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Autores principales: de la Cruz Vargas-Cordero, Iván, Villar-Muñoz, Lucia, Tinivella, Umberta, Giustiniani, Michela, Bangs, Nathan, Bento, Joaquim P., Contreras-Reyes, Eduardo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8671430/
https://www.ncbi.nlm.nih.gov/pubmed/34907271
http://dx.doi.org/10.1038/s41598-021-03371-z
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author de la Cruz Vargas-Cordero, Iván
Villar-Muñoz, Lucia
Tinivella, Umberta
Giustiniani, Michela
Bangs, Nathan
Bento, Joaquim P.
Contreras-Reyes, Eduardo
author_facet de la Cruz Vargas-Cordero, Iván
Villar-Muñoz, Lucia
Tinivella, Umberta
Giustiniani, Michela
Bangs, Nathan
Bento, Joaquim P.
Contreras-Reyes, Eduardo
author_sort de la Cruz Vargas-Cordero, Iván
collection PubMed
description The Central-South Chile margin is an excellent site to address the changes in the gas hydrate system since the last deglaciation associated with tectonic uplift and great earthquakes. However, the dynamic of the gas hydrate/free gas system along south central Chile is currently not well understood. From geophysical data and modeling analyses, we evaluate gas hydrate/free gas concentrations along a seismic line, derive geothermal gradients, and model past positions of the Bottom Simulating Reflector (BSR; until 13,000 years BP). The results reveal high hydrate/free gas concentrations and local geothermal gradient anomalies related to fluid migration through faults linked to seafloor mud volcanoes. The BSR-derived geothermal gradient, the base of free gas layers, BSR distribution and models of the paleo-BSR form a basis to evaluate the origin of the gas. If paleo-BSR coincides with the base of the free gas, the gas presence can be related to the gas hydrate dissociation due to climate change and geological evolution. Only if the base of free gas reflector is deeper than the paleo-BSR, a deeper gas supply can be invoked.
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spelling pubmed-86714302021-12-16 Gas origin linked to paleo BSR de la Cruz Vargas-Cordero, Iván Villar-Muñoz, Lucia Tinivella, Umberta Giustiniani, Michela Bangs, Nathan Bento, Joaquim P. Contreras-Reyes, Eduardo Sci Rep Article The Central-South Chile margin is an excellent site to address the changes in the gas hydrate system since the last deglaciation associated with tectonic uplift and great earthquakes. However, the dynamic of the gas hydrate/free gas system along south central Chile is currently not well understood. From geophysical data and modeling analyses, we evaluate gas hydrate/free gas concentrations along a seismic line, derive geothermal gradients, and model past positions of the Bottom Simulating Reflector (BSR; until 13,000 years BP). The results reveal high hydrate/free gas concentrations and local geothermal gradient anomalies related to fluid migration through faults linked to seafloor mud volcanoes. The BSR-derived geothermal gradient, the base of free gas layers, BSR distribution and models of the paleo-BSR form a basis to evaluate the origin of the gas. If paleo-BSR coincides with the base of the free gas, the gas presence can be related to the gas hydrate dissociation due to climate change and geological evolution. Only if the base of free gas reflector is deeper than the paleo-BSR, a deeper gas supply can be invoked. Nature Publishing Group UK 2021-12-14 /pmc/articles/PMC8671430/ /pubmed/34907271 http://dx.doi.org/10.1038/s41598-021-03371-z Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
de la Cruz Vargas-Cordero, Iván
Villar-Muñoz, Lucia
Tinivella, Umberta
Giustiniani, Michela
Bangs, Nathan
Bento, Joaquim P.
Contreras-Reyes, Eduardo
Gas origin linked to paleo BSR
title Gas origin linked to paleo BSR
title_full Gas origin linked to paleo BSR
title_fullStr Gas origin linked to paleo BSR
title_full_unstemmed Gas origin linked to paleo BSR
title_short Gas origin linked to paleo BSR
title_sort gas origin linked to paleo bsr
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8671430/
https://www.ncbi.nlm.nih.gov/pubmed/34907271
http://dx.doi.org/10.1038/s41598-021-03371-z
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