Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes
Abstract Orbital spectroscopy and laboratory analyses are utilized to identify major geochemical variations throughout the Ferrar Dolerite exposed in the McMurdo Dry Valleys (MDV) of Antarctica. Our laboratory results highlight the range of primary and secondary chemical and spectral variations obse...
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Online Access: | http://dx.doi.org/10.1017/s0954102013000254 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102013000254 |
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crcambridgeupr:10.1017/s0954102013000254 2024-06-23T07:47:39+00:00 Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes Salvatore, M.R. Mustard, J.F. Head, J.W. Marchant, D.R. Wyatt, M.B. 2013 http://dx.doi.org/10.1017/s0954102013000254 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102013000254 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 26, issue 1, page 49-68 ISSN 0954-1020 1365-2079 journal-article 2013 crcambridgeupr https://doi.org/10.1017/s0954102013000254 2024-06-12T04:05:01Z Abstract Orbital spectroscopy and laboratory analyses are utilized to identify major geochemical variations throughout the Ferrar Dolerite exposed in the McMurdo Dry Valleys (MDV) of Antarctica. Our laboratory results highlight the range of primary and secondary chemical and spectral variations observed throughout the dolerite, and provide the necessary calibration for detailed orbital investigations. Pure dolerite units are identified and analysed throughout the MDV using Advanced Land Imager (ALI) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) orbital datasets. In conjunction with our laboratory analyses, orbital analyses indicate that the dolerite sills are dominated by MgO concentrations of c. 6–7 wt% except where influenced by orthopyroxene-laden magmatic injections, where MgO concentrations can reach as high as 32.5 wt%. ASTER analyses also indicate that spectrally significant alteration is limited primarily to surfaces dominated by fine-grained dolerites, which form and preserve well developed alteration rinds due to their resistance to physical erosion. The archetype of these secondary signatures is Beacon Valley, where a combination of cold, dry, and stable environmental conditions and the presence of fine-grained dolerites results in strong alteration signatures. This work provides unprecedented spatial coverage of meso- and macro-scale geochemical features that, until now, have only been identified in field and laboratory investigations. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica McMurdo Dry Valleys Cambridge University Press Beacon Valley ENVELOPE(160.650,160.650,-77.817,-77.817) McMurdo Dry Valleys Antarctic Science 26 1 49 68 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Orbital spectroscopy and laboratory analyses are utilized to identify major geochemical variations throughout the Ferrar Dolerite exposed in the McMurdo Dry Valleys (MDV) of Antarctica. Our laboratory results highlight the range of primary and secondary chemical and spectral variations observed throughout the dolerite, and provide the necessary calibration for detailed orbital investigations. Pure dolerite units are identified and analysed throughout the MDV using Advanced Land Imager (ALI) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) orbital datasets. In conjunction with our laboratory analyses, orbital analyses indicate that the dolerite sills are dominated by MgO concentrations of c. 6–7 wt% except where influenced by orthopyroxene-laden magmatic injections, where MgO concentrations can reach as high as 32.5 wt%. ASTER analyses also indicate that spectrally significant alteration is limited primarily to surfaces dominated by fine-grained dolerites, which form and preserve well developed alteration rinds due to their resistance to physical erosion. The archetype of these secondary signatures is Beacon Valley, where a combination of cold, dry, and stable environmental conditions and the presence of fine-grained dolerites results in strong alteration signatures. This work provides unprecedented spatial coverage of meso- and macro-scale geochemical features that, until now, have only been identified in field and laboratory investigations. |
format |
Article in Journal/Newspaper |
author |
Salvatore, M.R. Mustard, J.F. Head, J.W. Marchant, D.R. Wyatt, M.B. |
spellingShingle |
Salvatore, M.R. Mustard, J.F. Head, J.W. Marchant, D.R. Wyatt, M.B. Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes |
author_facet |
Salvatore, M.R. Mustard, J.F. Head, J.W. Marchant, D.R. Wyatt, M.B. |
author_sort |
Salvatore, M.R. |
title |
Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes |
title_short |
Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes |
title_full |
Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes |
title_fullStr |
Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes |
title_full_unstemmed |
Characterization of spectral and geochemical variability within the Ferrar Dolerite of the McMurdo Dry Valleys, Antarctica: weathering, alteration, and magmatic processes |
title_sort |
characterization of spectral and geochemical variability within the ferrar dolerite of the mcmurdo dry valleys, antarctica: weathering, alteration, and magmatic processes |
publisher |
Cambridge University Press (CUP) |
publishDate |
2013 |
url |
http://dx.doi.org/10.1017/s0954102013000254 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102013000254 |
long_lat |
ENVELOPE(160.650,160.650,-77.817,-77.817) |
geographic |
Beacon Valley McMurdo Dry Valleys |
geographic_facet |
Beacon Valley McMurdo Dry Valleys |
genre |
Antarc* Antarctic Science Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Science Antarctica McMurdo Dry Valleys |
op_source |
Antarctic Science volume 26, issue 1, page 49-68 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102013000254 |
container_title |
Antarctic Science |
container_volume |
26 |
container_issue |
1 |
container_start_page |
49 |
op_container_end_page |
68 |
_version_ |
1802651796348338176 |