Melt production beneath Mt. Shasta from boron data in primitive melt inclusions.
Science
; 293(5528): 281-3, 2001 Jul 13.
Article
em En
| MEDLINE
| ID: mdl-11452119
ABSTRACT
Most arc magmas are thought to be generated by partial melting of the mantle wedge induced by infiltration of slab-derived fluids. However, partial melting of subducting oceanic crust has also been proposed to contribute to the melt generation process, especially when young and hot lithosphere is being subducted. The isotopic composition of boron measured in situ in olivine-hosted primitive melt inclusions in a basaltic andesite from Mt. Shasta, California, is characterized by large negative values that are also highly variable (delta(11)B = -21.3 to -0.9 per mil). The boron concentrations, from 0.7 to 1.6 parts per million, are lower than in most other arc lavas. The relation between concentration and isotopic composition of boron observed here supports a hypothesis that materials left after dehydration of the subducting slab may have contributed to the generation of basaltic andesite lavas at Mt. Shasta.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article