Zeolite compositions as proxies for eruptive paleoenvironment
We report chemical compositions of authigenic alteration minerals in subglacially erupted hyaloclastite breccias from James Ross Island, Antarctica, which provide a geochemical proxy for paleoenvironment. Analyses of zeolites (phillipsite and chabazite) from several lava-fed deltas on the island wer...
Published in: | Geochemistry, Geophysics, Geosystems |
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American Geophysical Union
2007
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ftnerc:oai:nora.nerc.ac.uk:1210 2024-06-09T07:40:51+00:00 Zeolite compositions as proxies for eruptive paleoenvironment Johnson, Joanne S. Smellie, John L. 2007 http://nora.nerc.ac.uk/id/eprint/1210/ http://www.agu.org/pubs/crossref/2007/2006GC001450.shtml unknown American Geophysical Union Johnson, Joanne S. orcid:0000-0003-4537-4447 Smellie, John L. 2007 Zeolite compositions as proxies for eruptive paleoenvironment. Geochemistry, Geophysics, Geosystems, 8 (3), Q03009. 19, pp. https://doi.org/10.1029/2006GC001450 <https://doi.org/10.1029/2006GC001450> Earth Sciences Publication - Article PeerReviewed 2007 ftnerc https://doi.org/10.1029/2006GC001450 2024-05-15T08:39:04Z We report chemical compositions of authigenic alteration minerals in subglacially erupted hyaloclastite breccias from James Ross Island, Antarctica, which provide a geochemical proxy for paleoenvironment. Analyses of zeolites (phillipsite and chabazite) from several lava-fed deltas on the island were compared with published compositions of zeolites from known freshwater and marine environments. Using values of (Na + K)/Ca = 3.0 (for phillipsites) and 1.0 (for chabazites), the data successfully distinguish between marine and freshwater alteration. However, our study also suggests that volcanic breccias may not be sealed to fluids, even when the pore spaces are completely filled. The James Ross Island data show that, at higher elevations in lava-fed deltas, the zeolites preserve their original freshwater-influenced (i.e., glacial) compositions, whereas at lower elevations, (Na + K)/Ca ratios are generally higher and indicate a later marine influence. We suggest that water may penetrate several kilometers into the volcanic pile by movement along fractures and/or grain boundaries. Article in Journal/Newspaper Antarc* Antarctica James Ross Island Ross Island Natural Environment Research Council: NERC Open Research Archive Ross Island Geochemistry, Geophysics, Geosystems 8 3 n/a n/a |
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Natural Environment Research Council: NERC Open Research Archive |
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unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Johnson, Joanne S. Smellie, John L. Zeolite compositions as proxies for eruptive paleoenvironment |
topic_facet |
Earth Sciences |
description |
We report chemical compositions of authigenic alteration minerals in subglacially erupted hyaloclastite breccias from James Ross Island, Antarctica, which provide a geochemical proxy for paleoenvironment. Analyses of zeolites (phillipsite and chabazite) from several lava-fed deltas on the island were compared with published compositions of zeolites from known freshwater and marine environments. Using values of (Na + K)/Ca = 3.0 (for phillipsites) and 1.0 (for chabazites), the data successfully distinguish between marine and freshwater alteration. However, our study also suggests that volcanic breccias may not be sealed to fluids, even when the pore spaces are completely filled. The James Ross Island data show that, at higher elevations in lava-fed deltas, the zeolites preserve their original freshwater-influenced (i.e., glacial) compositions, whereas at lower elevations, (Na + K)/Ca ratios are generally higher and indicate a later marine influence. We suggest that water may penetrate several kilometers into the volcanic pile by movement along fractures and/or grain boundaries. |
format |
Article in Journal/Newspaper |
author |
Johnson, Joanne S. Smellie, John L. |
author_facet |
Johnson, Joanne S. Smellie, John L. |
author_sort |
Johnson, Joanne S. |
title |
Zeolite compositions as proxies for eruptive paleoenvironment |
title_short |
Zeolite compositions as proxies for eruptive paleoenvironment |
title_full |
Zeolite compositions as proxies for eruptive paleoenvironment |
title_fullStr |
Zeolite compositions as proxies for eruptive paleoenvironment |
title_full_unstemmed |
Zeolite compositions as proxies for eruptive paleoenvironment |
title_sort |
zeolite compositions as proxies for eruptive paleoenvironment |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
http://nora.nerc.ac.uk/id/eprint/1210/ http://www.agu.org/pubs/crossref/2007/2006GC001450.shtml |
geographic |
Ross Island |
geographic_facet |
Ross Island |
genre |
Antarc* Antarctica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctica James Ross Island Ross Island |
op_relation |
Johnson, Joanne S. orcid:0000-0003-4537-4447 Smellie, John L. 2007 Zeolite compositions as proxies for eruptive paleoenvironment. Geochemistry, Geophysics, Geosystems, 8 (3), Q03009. 19, pp. https://doi.org/10.1029/2006GC001450 <https://doi.org/10.1029/2006GC001450> |
op_doi |
https://doi.org/10.1029/2006GC001450 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
8 |
container_issue |
3 |
container_start_page |
n/a |
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n/a |
_version_ |
1801369248448118784 |