Vesicularity of Mid-Oceanic Pillow Lavas
In contrast to pillow lavas from the marine environment around Iceland and Hawaii, tholeiitic pillow lavas from the Mid-Atlantic Ridge at 45° N do not show a correlation between vesicle size and depth of recovery. Post-eruptive vertical block faulting may have displaced the lavas from their original...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1971
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Online Access: | http://dx.doi.org/10.1139/e71-118 http://www.nrcresearchpress.com/doi/pdf/10.1139/e71-118 |
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crcansciencepubl:10.1139/e71-118 2023-12-17T10:32:03+01:00 Vesicularity of Mid-Oceanic Pillow Lavas Aumento, F. 1971 http://dx.doi.org/10.1139/e71-118 http://www.nrcresearchpress.com/doi/pdf/10.1139/e71-118 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 8, issue 10, page 1315-1319 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1971 crcansciencepubl https://doi.org/10.1139/e71-118 2023-11-19T13:39:40Z In contrast to pillow lavas from the marine environment around Iceland and Hawaii, tholeiitic pillow lavas from the Mid-Atlantic Ridge at 45° N do not show a correlation between vesicle size and depth of recovery. Post-eruptive vertical block faulting may have displaced the lavas from their original extrusion depth by as much as 1500 m, explaining in part the lack of correlation. Calculation of the original depth of extrusion by compensation for these vertical movements indicates that many of the basalts now high on the Crest Mountains were extruded in deep water (2900–3500 m), possibly within the floor of the Median Valley. Nevertheless, they were able to produce numerous, comparatively large vesicles, permitting the basalts to outgas radiogenic argon trapped in the magmas.Bulk chemical differences between the 45? N basalts and those of Iceland and Hawaii cannot explain why those from 45? N are able to outgas under high hydrostatic pressure. Different histories prior to extrusion may contribute to these varying characteristics. Article in Journal/Newspaper Iceland Canadian Science Publishing (via Crossref) Mid-Atlantic Ridge Canadian Journal of Earth Sciences 8 10 1315 1319 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Aumento, F. Vesicularity of Mid-Oceanic Pillow Lavas |
topic_facet |
General Earth and Planetary Sciences |
description |
In contrast to pillow lavas from the marine environment around Iceland and Hawaii, tholeiitic pillow lavas from the Mid-Atlantic Ridge at 45° N do not show a correlation between vesicle size and depth of recovery. Post-eruptive vertical block faulting may have displaced the lavas from their original extrusion depth by as much as 1500 m, explaining in part the lack of correlation. Calculation of the original depth of extrusion by compensation for these vertical movements indicates that many of the basalts now high on the Crest Mountains were extruded in deep water (2900–3500 m), possibly within the floor of the Median Valley. Nevertheless, they were able to produce numerous, comparatively large vesicles, permitting the basalts to outgas radiogenic argon trapped in the magmas.Bulk chemical differences between the 45? N basalts and those of Iceland and Hawaii cannot explain why those from 45? N are able to outgas under high hydrostatic pressure. Different histories prior to extrusion may contribute to these varying characteristics. |
format |
Article in Journal/Newspaper |
author |
Aumento, F. |
author_facet |
Aumento, F. |
author_sort |
Aumento, F. |
title |
Vesicularity of Mid-Oceanic Pillow Lavas |
title_short |
Vesicularity of Mid-Oceanic Pillow Lavas |
title_full |
Vesicularity of Mid-Oceanic Pillow Lavas |
title_fullStr |
Vesicularity of Mid-Oceanic Pillow Lavas |
title_full_unstemmed |
Vesicularity of Mid-Oceanic Pillow Lavas |
title_sort |
vesicularity of mid-oceanic pillow lavas |
publisher |
Canadian Science Publishing |
publishDate |
1971 |
url |
http://dx.doi.org/10.1139/e71-118 http://www.nrcresearchpress.com/doi/pdf/10.1139/e71-118 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Canadian Journal of Earth Sciences volume 8, issue 10, page 1315-1319 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e71-118 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
8 |
container_issue |
10 |
container_start_page |
1315 |
op_container_end_page |
1319 |
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1785585554216189952 |