Gas hydrate versus seabed morphology offshore Lebu (Chilean margin)

Abstract 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...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Iván Vargas-Cordero, Umberta Tinivella, Lucía Villar-Muñoz, Joaquim P. Bento, Carolina Cárcamo, Diego López-Acevedo, Francisco Fernandoy, Alessandra Rivero, Marion San Juan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d99c782a047a421d979074e5bbb7827d
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:d99c782a047a421d979074e5bbb7827d
record_format	dspace
spelling	oai:doaj.org-article:d99c782a047a421d979074e5bbb7827d2021-12-02T12:42:27ZGas hydrate versus seabed morphology offshore Lebu (Chilean margin)10.1038/s41598-020-78958-z2045-2322https://doaj.org/article/d99c782a047a421d979074e5bbb7827d2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78958-zhttps://doaj.org/toc/2045-2322Abstract 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 δ18O (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.Iván Vargas-CorderoUmberta TinivellaLucía Villar-MuñozJoaquim P. BentoCarolina CárcamoDiego López-AcevedoFrancisco FernandoyAlessandra RiveroMarion San JuanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-13 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Iván Vargas-Cordero Umberta Tinivella Lucía Villar-Muñoz Joaquim P. Bento Carolina Cárcamo Diego López-Acevedo Francisco Fernandoy Alessandra Rivero Marion San Juan Gas hydrate versus seabed morphology offshore Lebu (Chilean margin)
description	Abstract 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 δ18O (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	article
author	Iván Vargas-Cordero Umberta Tinivella Lucía Villar-Muñoz Joaquim P. Bento Carolina Cárcamo Diego López-Acevedo Francisco Fernandoy Alessandra Rivero Marion San Juan
author_facet	Iván Vargas-Cordero Umberta Tinivella Lucía Villar-Muñoz Joaquim P. Bento Carolina Cárcamo Diego López-Acevedo Francisco Fernandoy Alessandra Rivero Marion San Juan
author_sort	Iván Vargas-Cordero
title	Gas hydrate versus seabed morphology offshore Lebu (Chilean margin)
title_short	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_sort	gas hydrate versus seabed morphology offshore lebu (chilean margin)
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/d99c782a047a421d979074e5bbb7827d
work_keys_str_mv	AT ivanvargascordero gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT umbertatinivella gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT luciavillarmunoz gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT joaquimpbento gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT carolinacarcamo gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT diegolopezacevedo gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT franciscofernandoy gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT alessandrarivero gashydrateversusseabedmorphologyoffshorelebuchileanmargin AT marionsanjuan gashydrateversusseabedmorphologyoffshorelebuchileanmargin
_version_	1718393712055156736

Gas hydrate versus seabed morphology offshore Lebu (Chilean margin)

Ejemplares similares