PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA
Mineralogical and geochemical data of glacial sediments of Low Head, King George Island, Antarctica, are presented to approach its provenance and alterations aspects. Mineralogical analyses were performed using petrography and an x-ray diffraction method, while to the geochemistry was performed by x...
Published in: | Journal of Sedimentary Environments |
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Language: | English |
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Univ Estado Rio De Janeiro, Fac Geologia
2019
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Online Access: | http://hdl.handle.net/11449/184437 https://doi.org/10.12957/jse.2019.41788 |
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ftunivespir:oai:repositorio.unesp.br:11449/184437 2023-07-02T03:30:12+02:00 PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA Gabrig Turbay Rangel, Caio Vinicius D'Azeredo Orlando, Marcos Tadeu Jardim, Hannah Almeida Carreiro Almeida, Ivan Carlos Mendonca, Eduardo De Sa Teixeira, Daniel De Bortoli Thomazini, Andre Schaefer, Carlos Ernesto Universidade Estadual Paulista (UNESP) 2019-01-01 124-142 http://hdl.handle.net/11449/184437 https://doi.org/10.12957/jse.2019.41788 eng eng Univ Estado Rio De Janeiro, Fac Geologia Journal Of Sedimentary Environments http://dx.doi.org/10.12957/jse.2019.41788 Journal Of Sedimentary Environments. Rio De Janeio: Univ Estado Rio De Janeiro, Fac Geologia, v. 4, n. 1, p. 124-142, 2019. 2447-9462 http://hdl.handle.net/11449/184437 doi:10.12957/jse.2019.41788 WOS:000463840900007 closedAccess Sediment provenance Alteration Glaciogenic sediments Mineralogy Geochemistry info:eu-repo/semantics/article 2019 ftunivespir https://doi.org/10.12957/jse.2019.41788 2023-06-12T17:13:26Z Mineralogical and geochemical data of glacial sediments of Low Head, King George Island, Antarctica, are presented to approach its provenance and alterations aspects. Mineralogical analyses were performed using petrography and an x-ray diffraction method, while to the geochemistry was performed by x-ray fluorescence. Comparisons using major elements in the sediments with possible source areas, suggested that they are closest to the King George Island parent rocks, with no contribution of rocks from Antarctic Peninsula. The gravel and sand fractions demonstrate that the till is composed of basaltic and andesitic rock fragments, plagioclase, pyroxene and amphibole, typical of active immature volcanic arc. The mud fraction indicates chemical characteristics consistent with calc-alkaline to tolleitic and metalluminous affinity of source rock of the till and the presence of secondary mineral phases, such as laumontite, brucite and saponite. The values of alteration indices, such as the chemical index of alteration (CIA) and the SiO2/Al2O3 ratio, in the regional rocks and sediments reflect a remarkable degree of alteration, possibly due to hydrothermal activity, exemplified by the presence of laumontite. In addition, bivariate chemical diagrams suggest slight weathering compared to the South Shetland Islands, which may have been responsible for the formation of brucite and saponite. The results suggest that although there are secondary mineral products, some grade of weathering could have acted in the till during sedimentary cycles or the till was strongly influenced by components of local weathered basalts. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica King George Island South Shetland Islands Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP Antarctic Antarctic Peninsula King George Island Low Head ENVELOPE(-58.133,-58.133,-62.150,-62.150) South Shetland Islands Journal of Sedimentary Environments 4 1 124 142 |
institution |
Open Polar |
collection |
Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP |
op_collection_id |
ftunivespir |
language |
English |
topic |
Sediment provenance Alteration Glaciogenic sediments Mineralogy Geochemistry |
spellingShingle |
Sediment provenance Alteration Glaciogenic sediments Mineralogy Geochemistry Gabrig Turbay Rangel, Caio Vinicius D'Azeredo Orlando, Marcos Tadeu Jardim, Hannah Almeida Carreiro Almeida, Ivan Carlos Mendonca, Eduardo De Sa Teixeira, Daniel De Bortoli Thomazini, Andre Schaefer, Carlos Ernesto PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA |
topic_facet |
Sediment provenance Alteration Glaciogenic sediments Mineralogy Geochemistry |
description |
Mineralogical and geochemical data of glacial sediments of Low Head, King George Island, Antarctica, are presented to approach its provenance and alterations aspects. Mineralogical analyses were performed using petrography and an x-ray diffraction method, while to the geochemistry was performed by x-ray fluorescence. Comparisons using major elements in the sediments with possible source areas, suggested that they are closest to the King George Island parent rocks, with no contribution of rocks from Antarctic Peninsula. The gravel and sand fractions demonstrate that the till is composed of basaltic and andesitic rock fragments, plagioclase, pyroxene and amphibole, typical of active immature volcanic arc. The mud fraction indicates chemical characteristics consistent with calc-alkaline to tolleitic and metalluminous affinity of source rock of the till and the presence of secondary mineral phases, such as laumontite, brucite and saponite. The values of alteration indices, such as the chemical index of alteration (CIA) and the SiO2/Al2O3 ratio, in the regional rocks and sediments reflect a remarkable degree of alteration, possibly due to hydrothermal activity, exemplified by the presence of laumontite. In addition, bivariate chemical diagrams suggest slight weathering compared to the South Shetland Islands, which may have been responsible for the formation of brucite and saponite. The results suggest that although there are secondary mineral products, some grade of weathering could have acted in the till during sedimentary cycles or the till was strongly influenced by components of local weathered basalts. |
author2 |
Universidade Estadual Paulista (UNESP) |
format |
Article in Journal/Newspaper |
author |
Gabrig Turbay Rangel, Caio Vinicius D'Azeredo Orlando, Marcos Tadeu Jardim, Hannah Almeida Carreiro Almeida, Ivan Carlos Mendonca, Eduardo De Sa Teixeira, Daniel De Bortoli Thomazini, Andre Schaefer, Carlos Ernesto |
author_facet |
Gabrig Turbay Rangel, Caio Vinicius D'Azeredo Orlando, Marcos Tadeu Jardim, Hannah Almeida Carreiro Almeida, Ivan Carlos Mendonca, Eduardo De Sa Teixeira, Daniel De Bortoli Thomazini, Andre Schaefer, Carlos Ernesto |
author_sort |
Gabrig Turbay Rangel, Caio Vinicius |
title |
PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA |
title_short |
PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA |
title_full |
PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA |
title_fullStr |
PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA |
title_full_unstemmed |
PROVENANCE AND ALTERATION OF GLACIAL SEDIMENTS IN KING GEORGE ISLAND, ANTARCTICA |
title_sort |
provenance and alteration of glacial sediments in king george island, antarctica |
publisher |
Univ Estado Rio De Janeiro, Fac Geologia |
publishDate |
2019 |
url |
http://hdl.handle.net/11449/184437 https://doi.org/10.12957/jse.2019.41788 |
long_lat |
ENVELOPE(-58.133,-58.133,-62.150,-62.150) |
geographic |
Antarctic Antarctic Peninsula King George Island Low Head South Shetland Islands |
geographic_facet |
Antarctic Antarctic Peninsula King George Island Low Head South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica King George Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica King George Island South Shetland Islands |
op_relation |
Journal Of Sedimentary Environments http://dx.doi.org/10.12957/jse.2019.41788 Journal Of Sedimentary Environments. Rio De Janeio: Univ Estado Rio De Janeiro, Fac Geologia, v. 4, n. 1, p. 124-142, 2019. 2447-9462 http://hdl.handle.net/11449/184437 doi:10.12957/jse.2019.41788 WOS:000463840900007 |
op_rights |
closedAccess |
op_doi |
https://doi.org/10.12957/jse.2019.41788 |
container_title |
Journal of Sedimentary Environments |
container_volume |
4 |
container_issue |
1 |
container_start_page |
124 |
op_container_end_page |
142 |
_version_ |
1770274431279562752 |