Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)

Gas chromatography–mass spectrometry was applied to samples collected from an exceptionally well-preserved Late Jurassic (~150 Ma) sinter complex of the Claudia palaeo-geothermal field, Deseado Massif geological province, Argentinean Patagonia, which, despite its age, has never been deeply buried. R...

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Detalles Bibliográficos
Autores principales: Teece, Bronwyn L., Guido, Diego Martín, Campbell, Kathleen A., Van Kranendonk, Martin J., Galar, Amanda, Georg, Simon C.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2022
Materias:
Geología
Astrobiology
Biomarkers
Hydrocarbons
Hot spring
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/160355
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-160355
record_format dspace
spelling I19-R120-10915-1603552023-11-21T20:07:39Z http://sedici.unlp.edu.ar/handle/10915/160355 Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina) Teece, Bronwyn L. Guido, Diego Martín Campbell, Kathleen A. Van Kranendonk, Martin J. Galar, Amanda Georg, Simon C. 2022-09-15 2023-11-21T17:05:13Z en Geología Astrobiology Biomarkers Hydrocarbons Hot spring Gas chromatography–mass spectrometry was applied to samples collected from an exceptionally well-preserved Late Jurassic (~150 Ma) sinter complex of the Claudia palaeo-geothermal field, Deseado Massif geological province, Argentinean Patagonia, which, despite its age, has never been deeply buried. Results indicate that the distal sinter apron has a much higher preservation potential for indigenous organic matter (OM) than the more proximal (vent area) facies of this palaeo-geothermal field. Specifically, homohopane ratios show that the OM of the proximal apron is of mixed thermal maturities and is in low abundance. In contrast, the OM extracted from the distal apron contains highly abundant, thermally immature biomarkers, the presence of which are consistent with the lower original fluid temperatures of the distal spring facies. Moreover, despite indications of the presence of some thermally mature aromatic compounds, hopane and sterane ratios confirm that the distal apron samples are extremely thermally immature and thereby constitute an area of exceptional molecular preservation. From an astrobiological viewpoint, these results suggest that silica sinter can preserve abundant organics over millions of years in palaeoenvironmentally conducive settings, and that sample-site selection within a hot spring facies-model framework may be critical in the successful search for ancient extra-terrestrial life. Facultad de Ciencias Naturales y Museo Instituto de Recursos Minerales Consejo Nacional de Investigaciones Científicas y Técnicas Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Astrobiology
Biomarkers
Hydrocarbons
Hot spring
spellingShingle Geología
Astrobiology
Biomarkers
Hydrocarbons
Hot spring
Teece, Bronwyn L.
Guido, Diego Martín
Campbell, Kathleen A.
Van Kranendonk, Martin J.
Galar, Amanda
Georg, Simon C.
Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)
topic_facet Geología
Astrobiology
Biomarkers
Hydrocarbons
Hot spring
description Gas chromatography–mass spectrometry was applied to samples collected from an exceptionally well-preserved Late Jurassic (~150 Ma) sinter complex of the Claudia palaeo-geothermal field, Deseado Massif geological province, Argentinean Patagonia, which, despite its age, has never been deeply buried. Results indicate that the distal sinter apron has a much higher preservation potential for indigenous organic matter (OM) than the more proximal (vent area) facies of this palaeo-geothermal field. Specifically, homohopane ratios show that the OM of the proximal apron is of mixed thermal maturities and is in low abundance. In contrast, the OM extracted from the distal apron contains highly abundant, thermally immature biomarkers, the presence of which are consistent with the lower original fluid temperatures of the distal spring facies. Moreover, despite indications of the presence of some thermally mature aromatic compounds, hopane and sterane ratios confirm that the distal apron samples are extremely thermally immature and thereby constitute an area of exceptional molecular preservation. From an astrobiological viewpoint, these results suggest that silica sinter can preserve abundant organics over millions of years in palaeoenvironmentally conducive settings, and that sample-site selection within a hot spring facies-model framework may be critical in the successful search for ancient extra-terrestrial life.
format Articulo
Articulo
author Teece, Bronwyn L.
Guido, Diego Martín
Campbell, Kathleen A.
Van Kranendonk, Martin J.
Galar, Amanda
Georg, Simon C.
author_facet Teece, Bronwyn L.
Guido, Diego Martín
Campbell, Kathleen A.
Van Kranendonk, Martin J.
Galar, Amanda
Georg, Simon C.
author_sort Teece, Bronwyn L.
title Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)
title_short Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)
title_full Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)
title_fullStr Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)
title_full_unstemmed Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)
title_sort exceptional molecular preservation in the late jurassic claudia palaeo-geothermal field (deseado massif, patagonia, argentina)
publishDate 2022
url http://sedici.unlp.edu.ar/handle/10915/160355
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