Petrology and geochemical comparisons
Abstract. Late Cenozoic mafic alkaline volcanic rocks occur throughout the entire Pacific coast of West Antarctica, including in some of the islands adjacent or within the Bransfield Strait. Amongst them, Livingston Island is the least well-known, particularly in respect to mineralogy, petrology and...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.482.7098 2023-05-15T13:34:09+02:00 Petrology and geochemical comparisons Mineralogy Petrology Sofia Borislav K. Kamenov The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.482.7098 http://www.geology.bas.bg/mineralogy/gmp_files/gmp41/kamenov.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.482.7098 http://www.geology.bas.bg/mineralogy/gmp_files/gmp41/kamenov.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geology.bas.bg/mineralogy/gmp_files/gmp41/kamenov.pdf text ftciteseerx 2016-01-08T08:00:14Z Abstract. Late Cenozoic mafic alkaline volcanic rocks occur throughout the entire Pacific coast of West Antarctica, including in some of the islands adjacent or within the Bransfield Strait. Amongst them, Livingston Island is the least well-known, particularly in respect to mineralogy, petrology and geochemistry of the sparse manifestations of this type rocks, known as Inott Point Formation. The petrographic and geoche-mical aspects of old and new-discovered outcrops of primitive volcanic rocks are described. The new chemi-cal analyses specify the nomenclature as low-Ti undersaturated olivine basalts mainly, and hawaiites rarely. Comparisons with the trace element characteristics of the similar rocks from the islands Greenwich, Penguin, Deception and Bridgemen revealed common features: high LILE/HFSE ratios (e.g. Ba/Zr 1.4-2.2; Ba/Nb 42-67; Rb/Nb 2.7-4; Ce/Nb 2.5-10; Th/Nb 0.25- 0.90; K/Zr 39-67 etc.). These ratios are opposite to the low LILE/HFSE ratios in the alkalic provinces in Antarctic Peninsula (AP) and in Marie Byrd Land (MBL). The generally low absolute abundances of HFSE in all within and around the Bransfield Strait alkaline basalts and the high Zr/Nb (19-43) and Sr/Nb (>100) ratios are in contrast to such ratios in AP and MBL exposures. Higher degree of melting and variable interaction with the continental lithosphere is probably responsible for the geochemical differences with the alkaline basalts from the other provinces in West Antarctica. The regional geochemical LILE differences between MBL and AP substantiate the Text Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Livingston Island Marie Byrd Land West Antarctica Unknown Antarctic Antarctic Peninsula West Antarctica Bransfield Strait Pacific Byrd Greenwich Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Inott Point ENVELOPE(-60.006,-60.006,-62.525,-62.525) |
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ftciteseerx |
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English |
description |
Abstract. Late Cenozoic mafic alkaline volcanic rocks occur throughout the entire Pacific coast of West Antarctica, including in some of the islands adjacent or within the Bransfield Strait. Amongst them, Livingston Island is the least well-known, particularly in respect to mineralogy, petrology and geochemistry of the sparse manifestations of this type rocks, known as Inott Point Formation. The petrographic and geoche-mical aspects of old and new-discovered outcrops of primitive volcanic rocks are described. The new chemi-cal analyses specify the nomenclature as low-Ti undersaturated olivine basalts mainly, and hawaiites rarely. Comparisons with the trace element characteristics of the similar rocks from the islands Greenwich, Penguin, Deception and Bridgemen revealed common features: high LILE/HFSE ratios (e.g. Ba/Zr 1.4-2.2; Ba/Nb 42-67; Rb/Nb 2.7-4; Ce/Nb 2.5-10; Th/Nb 0.25- 0.90; K/Zr 39-67 etc.). These ratios are opposite to the low LILE/HFSE ratios in the alkalic provinces in Antarctic Peninsula (AP) and in Marie Byrd Land (MBL). The generally low absolute abundances of HFSE in all within and around the Bransfield Strait alkaline basalts and the high Zr/Nb (19-43) and Sr/Nb (>100) ratios are in contrast to such ratios in AP and MBL exposures. Higher degree of melting and variable interaction with the continental lithosphere is probably responsible for the geochemical differences with the alkaline basalts from the other provinces in West Antarctica. The regional geochemical LILE differences between MBL and AP substantiate the |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Mineralogy Petrology Sofia Borislav K. Kamenov |
spellingShingle |
Mineralogy Petrology Sofia Borislav K. Kamenov Petrology and geochemical comparisons |
author_facet |
Mineralogy Petrology Sofia Borislav K. Kamenov |
author_sort |
Mineralogy |
title |
Petrology and geochemical comparisons |
title_short |
Petrology and geochemical comparisons |
title_full |
Petrology and geochemical comparisons |
title_fullStr |
Petrology and geochemical comparisons |
title_full_unstemmed |
Petrology and geochemical comparisons |
title_sort |
petrology and geochemical comparisons |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.482.7098 http://www.geology.bas.bg/mineralogy/gmp_files/gmp41/kamenov.pdf |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-60.006,-60.006,-62.525,-62.525) |
geographic |
Antarctic Antarctic Peninsula West Antarctica Bransfield Strait Pacific Byrd Greenwich Livingston Island Marie Byrd Land Inott Point |
geographic_facet |
Antarctic Antarctic Peninsula West Antarctica Bransfield Strait Pacific Byrd Greenwich Livingston Island Marie Byrd Land Inott Point |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Livingston Island Marie Byrd Land West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Livingston Island Marie Byrd Land West Antarctica |
op_source |
http://www.geology.bas.bg/mineralogy/gmp_files/gmp41/kamenov.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.482.7098 http://www.geology.bas.bg/mineralogy/gmp_files/gmp41/kamenov.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766049303842783232 |