Mount Early and Sheridan Bluff: petrology
This study discusses the petrological and geochemical features of two monogenetic Miocene volcanoes, Mount Early and Sheridan Bluff, which are the above ice expressions of Earth's southernmost volcanic field located at c . 87°S on the East Antarctic craton. Their geochemistry is compared to bas...
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2020
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.5231830 https://geolsoc.figshare.com/collections/Mount_Early_and_Sheridan_Bluff_petrology/5231830 |
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ftdatacite:10.6084/m9.figshare.c.5231830 2023-05-15T13:44:57+02:00 Mount Early and Sheridan Bluff: petrology K.S. Panter J. Reindel J.L. Smellie 2020 https://dx.doi.org/10.6084/m9.figshare.c.5231830 https://geolsoc.figshare.com/collections/Mount_Early_and_Sheridan_Bluff_petrology/5231830 unknown Geological Society of London https://dx.doi.org/10.1144/m55-2019-2 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.5231830 https://doi.org/10.1144/m55-2019-2 2021-11-05T12:55:41Z This study discusses the petrological and geochemical features of two monogenetic Miocene volcanoes, Mount Early and Sheridan Bluff, which are the above ice expressions of Earth's southernmost volcanic field located at c . 87°S on the East Antarctic craton. Their geochemistry is compared to basalts from the West Antarctic rift system to test affiliation and resolve mantle sources and cause of melting beneath East Antarctica. Basaltic lavas and dykes are olivine-phyric and comprise alkaline (hawaiite and mugearite) and subalkaline (tholeiite) types. Trace element abundances and ratios (e.g., La/Yb, Nb/Y, Zr/Y) of alkaline compositions resemble basalts from the West Antarctic rift and ocean islands (OIB), while tholeiites are relatively depleted and approach the concentrations levels of enriched mid-ocean ridge basalt (E-MORB). The magmas evolved by fractional crystallization with contamination by crust; however, neither process can explain the contemporaneous eruption of hawaiite and tholeiite at Sheridan Bluff. Our preferred scenario is that primary magmas of each type were produced by different degrees of partial melting from a compositionally similar mantle source. The nearly simultaneous generation of lower degrees of melting to produce alkaline types and higher degrees of melting forming tholeiite was most likely facilitated by the detachment and dehydration of metasomatized mantle lithosphere. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica DataCite Metadata Store (German National Library of Science and Technology) Antarctic East Antarctica Sheridan Bluff ENVELOPE(-153.500,-153.500,-86.883,-86.883) Mount Early ENVELOPE(-113.950,-113.950,-75.217,-75.217) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences K.S. Panter J. Reindel J.L. Smellie Mount Early and Sheridan Bluff: petrology |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
This study discusses the petrological and geochemical features of two monogenetic Miocene volcanoes, Mount Early and Sheridan Bluff, which are the above ice expressions of Earth's southernmost volcanic field located at c . 87°S on the East Antarctic craton. Their geochemistry is compared to basalts from the West Antarctic rift system to test affiliation and resolve mantle sources and cause of melting beneath East Antarctica. Basaltic lavas and dykes are olivine-phyric and comprise alkaline (hawaiite and mugearite) and subalkaline (tholeiite) types. Trace element abundances and ratios (e.g., La/Yb, Nb/Y, Zr/Y) of alkaline compositions resemble basalts from the West Antarctic rift and ocean islands (OIB), while tholeiites are relatively depleted and approach the concentrations levels of enriched mid-ocean ridge basalt (E-MORB). The magmas evolved by fractional crystallization with contamination by crust; however, neither process can explain the contemporaneous eruption of hawaiite and tholeiite at Sheridan Bluff. Our preferred scenario is that primary magmas of each type were produced by different degrees of partial melting from a compositionally similar mantle source. The nearly simultaneous generation of lower degrees of melting to produce alkaline types and higher degrees of melting forming tholeiite was most likely facilitated by the detachment and dehydration of metasomatized mantle lithosphere. |
format |
Article in Journal/Newspaper |
author |
K.S. Panter J. Reindel J.L. Smellie |
author_facet |
K.S. Panter J. Reindel J.L. Smellie |
author_sort |
K.S. Panter |
title |
Mount Early and Sheridan Bluff: petrology |
title_short |
Mount Early and Sheridan Bluff: petrology |
title_full |
Mount Early and Sheridan Bluff: petrology |
title_fullStr |
Mount Early and Sheridan Bluff: petrology |
title_full_unstemmed |
Mount Early and Sheridan Bluff: petrology |
title_sort |
mount early and sheridan bluff: petrology |
publisher |
Geological Society of London |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5231830 https://geolsoc.figshare.com/collections/Mount_Early_and_Sheridan_Bluff_petrology/5231830 |
long_lat |
ENVELOPE(-153.500,-153.500,-86.883,-86.883) ENVELOPE(-113.950,-113.950,-75.217,-75.217) |
geographic |
Antarctic East Antarctica Sheridan Bluff Mount Early |
geographic_facet |
Antarctic East Antarctica Sheridan Bluff Mount Early |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_relation |
https://dx.doi.org/10.1144/m55-2019-2 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5231830 https://doi.org/10.1144/m55-2019-2 |
_version_ |
1766208850148458496 |