Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica
The Upper Cretaceous basic volcanic succession in Hannah Point, Livingston Island, Antarctica, presents a widespread occurrence of very low-grade secondary minerals. They occur filling amygdules, veins and veinlets, and replacing phenocrysts and groundmass/matrix. The paragenetic associations includ...
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ftunivchile:oai:repositorio.uchile.cl:2250/146347 2023-05-15T13:56:31+02:00 Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica Bastías, Joaquín Fuentes, Francisco Aguirre, Luis Hervé Allamand, Francisco Demant, Alain Deckart, Katja Torres, Teresa 2016 application/pdf https://doi.org/10.1016/j.clay.2016.07.025 https://repositorio.uchile.cl/handle/2250/146347 en eng Elsevier Applied Clay Science 134 (2016) 246–256 doi:10.1016/j.clay.2016.07.025 https://repositorio.uchile.cl/handle/2250/146347 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Applied Clay Science Zeolite Low-temperature metamorphism Smectite-chlorite Geothermal Burial metamorphism Antarctica Hydrothermal alteration Artículo de revista 2016 ftunivchile https://doi.org/10.1016/j.clay.2016.07.025 2023-01-22T01:00:05Z The Upper Cretaceous basic volcanic succession in Hannah Point, Livingston Island, Antarctica, presents a widespread occurrence of very low-grade secondary minerals. They occur filling amygdules, veins and veinlets, and replacing phenocrysts and groundmass/matrix. The paragenetic associations include minerals such as laumontite, heulandite, stilbite and clinoptilolite; mafic phyllosilicates corresponding to chlorite and smectite mixed layers (compositions ranging from 57% to 84% of chlorite), albite, calcite and minor celadonite. The mineral assemblages indicate, based on laboratory and field studies, these mineral paragenesis temperatures of 150200 C and pressures of 600-1.800 bars, which agrees with the calculated equilibrium temperatures of 160190 C, using chlorite geothermometry. These burial pressures, which were estimated from paragenesis, cannot be attained considering the present thickness of 500 m of the sequence, because at least 1 km of erosion is required to produce the mineral associations. Based on textural evidence, three successive stages are proposed to explain the genesis of the secondary minerals: (1) mafic phyllosilicates +/- celadonite, (2) zeolites and (3) calcite. The characteristics of these stages point to a regional burial metamorphism (stage 1) superimposed by hydro thermal alteration (stages 2 and 3). The mineral paragenetical evolution can be used as a proxy for the prospection of modem geothermal reservoirs by allowing the identification of hydrothermal alteration processes and burial metamorphism. Article in Journal/Newspaper Antarc* Antarctica Livingston Island Universidad de Chile: Repositorio académico Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Hannah ENVELOPE(-60.613,-60.613,-62.654,-62.654) Hannah Point ENVELOPE(-60.617,-60.617,-62.650,-62.650) Applied Clay Science 134 246 256 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Zeolite Low-temperature metamorphism Smectite-chlorite Geothermal Burial metamorphism Antarctica Hydrothermal alteration |
spellingShingle |
Zeolite Low-temperature metamorphism Smectite-chlorite Geothermal Burial metamorphism Antarctica Hydrothermal alteration Bastías, Joaquín Fuentes, Francisco Aguirre, Luis Hervé Allamand, Francisco Demant, Alain Deckart, Katja Torres, Teresa Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica |
topic_facet |
Zeolite Low-temperature metamorphism Smectite-chlorite Geothermal Burial metamorphism Antarctica Hydrothermal alteration |
description |
The Upper Cretaceous basic volcanic succession in Hannah Point, Livingston Island, Antarctica, presents a widespread occurrence of very low-grade secondary minerals. They occur filling amygdules, veins and veinlets, and replacing phenocrysts and groundmass/matrix. The paragenetic associations include minerals such as laumontite, heulandite, stilbite and clinoptilolite; mafic phyllosilicates corresponding to chlorite and smectite mixed layers (compositions ranging from 57% to 84% of chlorite), albite, calcite and minor celadonite. The mineral assemblages indicate, based on laboratory and field studies, these mineral paragenesis temperatures of 150200 C and pressures of 600-1.800 bars, which agrees with the calculated equilibrium temperatures of 160190 C, using chlorite geothermometry. These burial pressures, which were estimated from paragenesis, cannot be attained considering the present thickness of 500 m of the sequence, because at least 1 km of erosion is required to produce the mineral associations. Based on textural evidence, three successive stages are proposed to explain the genesis of the secondary minerals: (1) mafic phyllosilicates +/- celadonite, (2) zeolites and (3) calcite. The characteristics of these stages point to a regional burial metamorphism (stage 1) superimposed by hydro thermal alteration (stages 2 and 3). The mineral paragenetical evolution can be used as a proxy for the prospection of modem geothermal reservoirs by allowing the identification of hydrothermal alteration processes and burial metamorphism. |
format |
Article in Journal/Newspaper |
author |
Bastías, Joaquín Fuentes, Francisco Aguirre, Luis Hervé Allamand, Francisco Demant, Alain Deckart, Katja Torres, Teresa |
author_facet |
Bastías, Joaquín Fuentes, Francisco Aguirre, Luis Hervé Allamand, Francisco Demant, Alain Deckart, Katja Torres, Teresa |
author_sort |
Bastías, Joaquín |
title |
Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica |
title_short |
Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica |
title_full |
Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica |
title_fullStr |
Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica |
title_full_unstemmed |
Very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the Upper Cretaceous volcanic succession of Hannah Point, Livingston Island, Antarctica |
title_sort |
very low-grade secondary minerals as indicators of palaeo-hydrothermal systems in the upper cretaceous volcanic succession of hannah point, livingston island, antarctica |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.clay.2016.07.025 https://repositorio.uchile.cl/handle/2250/146347 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-60.613,-60.613,-62.654,-62.654) ENVELOPE(-60.617,-60.617,-62.650,-62.650) |
geographic |
Livingston Island Hannah Hannah Point |
geographic_facet |
Livingston Island Hannah Hannah Point |
genre |
Antarc* Antarctica Livingston Island |
genre_facet |
Antarc* Antarctica Livingston Island |
op_source |
Applied Clay Science |
op_relation |
Applied Clay Science 134 (2016) 246–256 doi:10.1016/j.clay.2016.07.025 https://repositorio.uchile.cl/handle/2250/146347 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.clay.2016.07.025 |
container_title |
Applied Clay Science |
container_volume |
134 |
container_start_page |
246 |
op_container_end_page |
256 |
_version_ |
1766264016800317440 |