Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica
We report on the petrology, microstructure and seismic properties of 44 peridotite xenoliths extracted from the upper mantle beneath Marie Byrd Land (MBL), West Antarctica. The aim of this work is to understand how melt–rock reaction, refertilization and deformation affected the seismic properties (...
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Geological Society of London
2021
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ftdatacite:10.6084/m9.figshare.c.5315261 2023-05-15T13:34:11+02:00 Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica V. Chatzaras S.C. Kruckenberg 2021 https://dx.doi.org/10.6084/m9.figshare.c.5315261 https://geolsoc.figshare.com/collections/Effects_of_melt-percolation_refertilization_and_deformation_on_upper_mantle_seismic_anisotropy_constraints_from_peridotite_xenoliths_Marie_Byrd_Land_West_Antarctica/5315261 unknown Geological Society of London https://dx.doi.org/10.1144/m56-2020-16 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 2021 ftdatacite https://doi.org/10.6084/m9.figshare.c.5315261 https://doi.org/10.1144/m56-2020-16 2021-11-05T12:55:41Z We report on the petrology, microstructure and seismic properties of 44 peridotite xenoliths extracted from the upper mantle beneath Marie Byrd Land (MBL), West Antarctica. The aim of this work is to understand how melt–rock reaction, refertilization and deformation affected the seismic properties (velocities, anisotropy) of the West Antarctic upper mantle, in the context of MBL tectonic evolution and West Antarctic Rift System formation. Modal compositions, mineral major element compositions, microstructures and crystallographic preferred orientations (CPOs) provide evidence for diachronous reactive melt percolation and refertilization. Olivine shows three main CPO patterns, the A-type, axial-[010] and axial-[100] texture types. Average seismic properties of the MBL mantle lithosphere are mainly controlled by the strength of olivine crystallographic texture. Reactive melt percolation and refertilization likely modified seismic velocities and anisotropy, as is suggested by a systematic decrease in maximum P-wave and S-wave anisotropies with increasing modal abundance of pyroxene. At larger spatial scales, the seismic properties of the MBL mantle xenoliths are dominated by the anisotropy resulting from the A-type olivine CPO. Variations between individual volcanic centres, however, attest to spatial variations in the mantle structure, potentially related to 3D deformation and the prolonged tectonic history of MBL. Article in Journal/Newspaper Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica DataCite Metadata Store (German National Library of Science and Technology) Antarctic West Antarctica Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) |
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 V. Chatzaras S.C. Kruckenberg Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
We report on the petrology, microstructure and seismic properties of 44 peridotite xenoliths extracted from the upper mantle beneath Marie Byrd Land (MBL), West Antarctica. The aim of this work is to understand how melt–rock reaction, refertilization and deformation affected the seismic properties (velocities, anisotropy) of the West Antarctic upper mantle, in the context of MBL tectonic evolution and West Antarctic Rift System formation. Modal compositions, mineral major element compositions, microstructures and crystallographic preferred orientations (CPOs) provide evidence for diachronous reactive melt percolation and refertilization. Olivine shows three main CPO patterns, the A-type, axial-[010] and axial-[100] texture types. Average seismic properties of the MBL mantle lithosphere are mainly controlled by the strength of olivine crystallographic texture. Reactive melt percolation and refertilization likely modified seismic velocities and anisotropy, as is suggested by a systematic decrease in maximum P-wave and S-wave anisotropies with increasing modal abundance of pyroxene. At larger spatial scales, the seismic properties of the MBL mantle xenoliths are dominated by the anisotropy resulting from the A-type olivine CPO. Variations between individual volcanic centres, however, attest to spatial variations in the mantle structure, potentially related to 3D deformation and the prolonged tectonic history of MBL. |
format |
Article in Journal/Newspaper |
author |
V. Chatzaras S.C. Kruckenberg |
author_facet |
V. Chatzaras S.C. Kruckenberg |
author_sort |
V. Chatzaras |
title |
Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica |
title_short |
Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica |
title_full |
Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica |
title_fullStr |
Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica |
title_full_unstemmed |
Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica |
title_sort |
effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, marie byrd land, west antarctica |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5315261 https://geolsoc.figshare.com/collections/Effects_of_melt-percolation_refertilization_and_deformation_on_upper_mantle_seismic_anisotropy_constraints_from_peridotite_xenoliths_Marie_Byrd_Land_West_Antarctica/5315261 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) |
geographic |
Antarctic West Antarctica Byrd Marie Byrd Land |
geographic_facet |
Antarctic West Antarctica Byrd Marie Byrd Land |
genre |
Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica |
op_relation |
https://dx.doi.org/10.1144/m56-2020-16 |
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.5315261 https://doi.org/10.1144/m56-2020-16 |
_version_ |
1766049589483274240 |