Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc
The geochemistry of western Aleutian seafloor volcanoes indicates that primitive dacitic lavas (63-71% SiO2, Mg/Mg+Fe > 0.65) containing low abundances of middle and heavy rare-earth elements (Yb) were probably produced by melting of an isotopically MORB-like (e.g., 87Sr/86Sr < 0.7027) pyroxen...
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ftunivsouthcar:oai:scholarcommons.sc.edu:etd-2319 2023-06-11T04:03:19+02:00 Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc Arndt, Shawn 2011-01-01T08:00:00Z application/pdf https://scholarcommons.sc.edu/etd/1318 https://scholarcommons.sc.edu/context/etd/article/2319/viewcontent/Arndt_sc_0202M_11583.pdf unknown Scholar Commons https://scholarcommons.sc.edu/etd/1318 https://scholarcommons.sc.edu/context/etd/article/2319/viewcontent/Arndt_sc_0202M_11583.pdf Theses and Dissertations Aleutians Amphibole Buldir Mixing Volcano Water Earth Sciences Geology Physical Sciences and Mathematics text 2011 ftunivsouthcar 2023-05-06T22:23:42Z The geochemistry of western Aleutian seafloor volcanoes indicates that primitive dacitic lavas (63-71% SiO2, Mg/Mg+Fe > 0.65) containing low abundances of middle and heavy rare-earth elements (Yb) were probably produced by melting of an isotopically MORB-like (e.g., 87Sr/86Sr < 0.7027) pyroxenite or subducted basaltic source. Andesites and dacites from emergent volcanoes throughout the Aleutians often also have low abundances of middle and heavy rare-earth elements (REE's), but these characteristics are widely attributed to fractional crystallization and the removal of amphibole from mafic melts in crustal magma chambers. For this study, geochemical data were collected for 50 lavas from Buldir Volcano, the westernmost emergent volcano in the Aleutian island arc, to investigate the role of amphibole fractionation versus source variability in the genesis of andesites and dacites from Buldir. Buldir lavas range from basalt to dacite and define a strongly calc-alkaline or low-Fe igneous series. Andesites and dacites at Buldir have low abundances of middle and heavy REE's ( Text Aleutian Island University of South Carolina Libraries: Scholar Commons Buldir Volcano ENVELOPE(175.909,175.909,52.349,52.349) |
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Open Polar |
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University of South Carolina Libraries: Scholar Commons |
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ftunivsouthcar |
language |
unknown |
topic |
Aleutians Amphibole Buldir Mixing Volcano Water Earth Sciences Geology Physical Sciences and Mathematics |
spellingShingle |
Aleutians Amphibole Buldir Mixing Volcano Water Earth Sciences Geology Physical Sciences and Mathematics Arndt, Shawn Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc |
topic_facet |
Aleutians Amphibole Buldir Mixing Volcano Water Earth Sciences Geology Physical Sciences and Mathematics |
description |
The geochemistry of western Aleutian seafloor volcanoes indicates that primitive dacitic lavas (63-71% SiO2, Mg/Mg+Fe > 0.65) containing low abundances of middle and heavy rare-earth elements (Yb) were probably produced by melting of an isotopically MORB-like (e.g., 87Sr/86Sr < 0.7027) pyroxenite or subducted basaltic source. Andesites and dacites from emergent volcanoes throughout the Aleutians often also have low abundances of middle and heavy rare-earth elements (REE's), but these characteristics are widely attributed to fractional crystallization and the removal of amphibole from mafic melts in crustal magma chambers. For this study, geochemical data were collected for 50 lavas from Buldir Volcano, the westernmost emergent volcano in the Aleutian island arc, to investigate the role of amphibole fractionation versus source variability in the genesis of andesites and dacites from Buldir. Buldir lavas range from basalt to dacite and define a strongly calc-alkaline or low-Fe igneous series. Andesites and dacites at Buldir have low abundances of middle and heavy REE's ( |
format |
Text |
author |
Arndt, Shawn |
author_facet |
Arndt, Shawn |
author_sort |
Arndt, Shawn |
title |
Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc |
title_short |
Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc |
title_full |
Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc |
title_fullStr |
Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc |
title_full_unstemmed |
Controls of Melt Genesis and Evolution at Buldir Volcano in the Western Aleutian Island Arc |
title_sort |
controls of melt genesis and evolution at buldir volcano in the western aleutian island arc |
publisher |
Scholar Commons |
publishDate |
2011 |
url |
https://scholarcommons.sc.edu/etd/1318 https://scholarcommons.sc.edu/context/etd/article/2319/viewcontent/Arndt_sc_0202M_11583.pdf |
long_lat |
ENVELOPE(175.909,175.909,52.349,52.349) |
geographic |
Buldir Volcano |
geographic_facet |
Buldir Volcano |
genre |
Aleutian Island |
genre_facet |
Aleutian Island |
op_source |
Theses and Dissertations |
op_relation |
https://scholarcommons.sc.edu/etd/1318 https://scholarcommons.sc.edu/context/etd/article/2319/viewcontent/Arndt_sc_0202M_11583.pdf |
_version_ |
1768378602524508160 |