3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution
We create a 3‐D density, temperature, and composition model of the Antarctic lithosphere using an integrative approach combining gravity, topography, and tomography data with mineral physics constraints and seismic data on crustal structures. The latter is used to create a new Moho and crustal densi...
Published in: | Geochemistry, Geophysics, Geosystems |
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_4161891 2023-05-15T13:35:25+02:00 3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution Haeger, C. Kaban, M. Tesauro, M. Petrunin, A. Mooney, W. 2019 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891 https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891_3/component/file_4190891/4161891.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GC008033 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1029/2018GC008033 https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891 https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891_3/component/file_4190891/4161891.pdf info:eu-repo/semantics/openAccess Geochemistry Geophysics Geosystems (G3) info:eu-repo/semantics/article 2019 ftgfzpotsdam https://doi.org/10.1029/2018GC008033 2022-09-14T05:56:34Z We create a 3‐D density, temperature, and composition model of the Antarctic lithosphere using an integrative approach combining gravity, topography, and tomography data with mineral physics constraints and seismic data on crustal structures. The latter is used to create a new Moho and crustal density model. Temperature and thermal density variations are estimated based on S wave velocities from two independent tomography models (SL2013sv and AN1‐S). Results of the Antarctic continent show the well‐known distinction between East and West Antarctica in temperature and density to a depth of about 200 km. Incorporating compositional variations in the temperature calculations increases temperatures in depleted regions by up to 150 °C, giving improved insights into thermal structures. The thickness of the lithospheric root also varies strongly between these regions, with values below 100 km in the west and above 200 km in the east. Regions with negative compositional density variations (<−0.040 g/cm3 at 100 km), high depletion (Mg # > 91.5), and low temperatures (<800 °C; central Dronning Maud Land, along the east flank of the Transantarctic Mountains) are interpreted as Precambrian cratonic fragments. Nearly undepleted lithosphere is found in the Lambert Graben and the Aurora Subglacial Basin and is attributed to Mesozoic rifting activity that has caused lithospheric rejuvenation. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land West Antarctica GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic The Antarctic Dronning Maud Land West Antarctica Transantarctic Mountains Geochemistry, Geophysics, Geosystems 20 2 688 707 |
institution |
Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
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ftgfzpotsdam |
language |
unknown |
description |
We create a 3‐D density, temperature, and composition model of the Antarctic lithosphere using an integrative approach combining gravity, topography, and tomography data with mineral physics constraints and seismic data on crustal structures. The latter is used to create a new Moho and crustal density model. Temperature and thermal density variations are estimated based on S wave velocities from two independent tomography models (SL2013sv and AN1‐S). Results of the Antarctic continent show the well‐known distinction between East and West Antarctica in temperature and density to a depth of about 200 km. Incorporating compositional variations in the temperature calculations increases temperatures in depleted regions by up to 150 °C, giving improved insights into thermal structures. The thickness of the lithospheric root also varies strongly between these regions, with values below 100 km in the west and above 200 km in the east. Regions with negative compositional density variations (<−0.040 g/cm3 at 100 km), high depletion (Mg # > 91.5), and low temperatures (<800 °C; central Dronning Maud Land, along the east flank of the Transantarctic Mountains) are interpreted as Precambrian cratonic fragments. Nearly undepleted lithosphere is found in the Lambert Graben and the Aurora Subglacial Basin and is attributed to Mesozoic rifting activity that has caused lithospheric rejuvenation. |
format |
Article in Journal/Newspaper |
author |
Haeger, C. Kaban, M. Tesauro, M. Petrunin, A. Mooney, W. |
spellingShingle |
Haeger, C. Kaban, M. Tesauro, M. Petrunin, A. Mooney, W. 3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution |
author_facet |
Haeger, C. Kaban, M. Tesauro, M. Petrunin, A. Mooney, W. |
author_sort |
Haeger, C. |
title |
3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution |
title_short |
3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution |
title_full |
3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution |
title_fullStr |
3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution |
title_full_unstemmed |
3‐D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution |
title_sort |
3‐d density, thermal, and compositional model of the antarctic lithosphere and implications for its evolution |
publishDate |
2019 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891 https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891_3/component/file_4190891/4161891.pdf |
geographic |
Antarctic The Antarctic Dronning Maud Land West Antarctica Transantarctic Mountains |
geographic_facet |
Antarctic The Antarctic Dronning Maud Land West Antarctica Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land West Antarctica |
op_source |
Geochemistry Geophysics Geosystems (G3) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GC008033 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1029/2018GC008033 https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891 https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161891_3/component/file_4190891/4161891.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018GC008033 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
20 |
container_issue |
2 |
container_start_page |
688 |
op_container_end_page |
707 |
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1766065318143197184 |