Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge
Fresh glassy basaltic andesite samples recovered from the northern part of the Pacific–Antarctic Ridge contain abundant spherulites consisting of arrays of closely packed clinopyroxene fibers. The spherulites frequently enclose elongated vesicles that are tear drop-shaped or tailed. The long axes of...
Published in: | Journal of Volcanology and Geothermal Research |
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Language: | English |
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Elsevier
2004
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ftoceanrep:oai:oceanrep.geomar.de:3562 2023-05-15T13:56:36+02:00 Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge Monecke, T. Renno, A. D. Herzig, Peter 2004 text https://oceanrep.geomar.de/id/eprint/3562/ https://oceanrep.geomar.de/id/eprint/3562/1/1-s2.0-S0377027303002786-main.pdf https://doi.org/10.1016/S0377-0273(03)00278-6 en eng Elsevier https://oceanrep.geomar.de/id/eprint/3562/1/1-s2.0-S0377027303002786-main.pdf Monecke, T., Renno, A. D. and Herzig, P. (2004) Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge. Journal of Volcanology and Geothermal Research, 130 . pp. 51-59. DOI 10.1016/S0377-0273(03)00278-6 <https://doi.org/10.1016/S0377-0273%2803%2900278-6>. doi:10.1016/S0377-0273(03)00278-6 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2004 ftoceanrep https://doi.org/10.1016/S0377-0273(03)00278-6 2023-04-07T14:47:57Z Fresh glassy basaltic andesite samples recovered from the northern part of the Pacific–Antarctic Ridge contain abundant spherulites consisting of arrays of closely packed clinopyroxene fibers. The spherulites frequently enclose elongated vesicles that are tear drop-shaped or tailed. The long axes of the elongated vesicles were found to be always parallel to the orientation of the surrounding crystal fibers. In several cases, elongated vesicles having different orientations are hosted by a single spherulite. The existence of elongated vesicles provides unequivocal evidence that a significant proportion of the clinopyroxene fibers must have crystallized directly from a supercooled liquid at temperatures above the glass transition. Moreover, the absence of fractures within the spherulites and the surrounding glass as well as the observed nucleation of clinopyroxene fibers at vesicle walls are interpreted to be consistent with a primary origin of the clinopyroxene spherulites. Based on these textural observations it has to be concluded that spherulites do not represent a diagnostic texture for the devitrification of volcanic glass that occurs below the glass transition temperature. Article in Journal/Newspaper Antarc* Antarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Pacific Journal of Volcanology and Geothermal Research 130 1-2 51 59 |
institution |
Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Fresh glassy basaltic andesite samples recovered from the northern part of the Pacific–Antarctic Ridge contain abundant spherulites consisting of arrays of closely packed clinopyroxene fibers. The spherulites frequently enclose elongated vesicles that are tear drop-shaped or tailed. The long axes of the elongated vesicles were found to be always parallel to the orientation of the surrounding crystal fibers. In several cases, elongated vesicles having different orientations are hosted by a single spherulite. The existence of elongated vesicles provides unequivocal evidence that a significant proportion of the clinopyroxene fibers must have crystallized directly from a supercooled liquid at temperatures above the glass transition. Moreover, the absence of fractures within the spherulites and the surrounding glass as well as the observed nucleation of clinopyroxene fibers at vesicle walls are interpreted to be consistent with a primary origin of the clinopyroxene spherulites. Based on these textural observations it has to be concluded that spherulites do not represent a diagnostic texture for the devitrification of volcanic glass that occurs below the glass transition temperature. |
format |
Article in Journal/Newspaper |
author |
Monecke, T. Renno, A. D. Herzig, Peter |
spellingShingle |
Monecke, T. Renno, A. D. Herzig, Peter Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge |
author_facet |
Monecke, T. Renno, A. D. Herzig, Peter |
author_sort |
Monecke, T. |
title |
Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge |
title_short |
Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge |
title_full |
Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge |
title_fullStr |
Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge |
title_full_unstemmed |
Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge |
title_sort |
primary clinopyroxene spherulites in basaltic lavas from the pacific-antarctic ridge |
publisher |
Elsevier |
publishDate |
2004 |
url |
https://oceanrep.geomar.de/id/eprint/3562/ https://oceanrep.geomar.de/id/eprint/3562/1/1-s2.0-S0377027303002786-main.pdf https://doi.org/10.1016/S0377-0273(03)00278-6 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/3562/1/1-s2.0-S0377027303002786-main.pdf Monecke, T., Renno, A. D. and Herzig, P. (2004) Primary clinopyroxene spherulites in basaltic lavas from the Pacific-Antarctic Ridge. Journal of Volcanology and Geothermal Research, 130 . pp. 51-59. DOI 10.1016/S0377-0273(03)00278-6 <https://doi.org/10.1016/S0377-0273%2803%2900278-6>. doi:10.1016/S0377-0273(03)00278-6 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0377-0273(03)00278-6 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
130 |
container_issue |
1-2 |
container_start_page |
51 |
op_container_end_page |
59 |
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1766264151952326656 |