Late Holocene hydrous mafic magmatism at the Paint Pot Crater and Callahan flows, Medicine Lake Volcano, N. California and the influence of H sub(2)O in the generation of silicic magmas

This paper characterizes late Holocene basalts and basaltic andesites at Medicine Lake volcano that contain high pre-eruptive H sub(2)O contents inherited from a subduction related hydrous component in the mantle. The basaltic andesite of Paint Pot Crater and the compositionally zoned basaltic to an...

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 2000-01, Vol.138 (1), p.1-16
Main Authors: Kinzler, R J, Donnelly-Nolan, J M, Grove, T L
Format: Article
Language:English
Online Access:Get full text
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Summary:This paper characterizes late Holocene basalts and basaltic andesites at Medicine Lake volcano that contain high pre-eruptive H sub(2)O contents inherited from a subduction related hydrous component in the mantle. The basaltic andesite of Paint Pot Crater and the compositionally zoned basaltic to andesitic lavas of the Callahan flow erupted approximately 1000 super(14)C years Before Present ( super(14)C years b.p.). Petrologic, geochemical and isotopic evidence indicates that this late Holocene mafic magmatism was characterized by H sub(2)O contents of 3 to 6wt% H sub(2)O and elevated abundances of large ion lithophile elements (LILE). These hydrous mafic inputs contrast with the preceding episodes of mafic magmatism (from 10,600 to 3000 super(14)C years b.p.) that was characterized by the eruption of primitive high alumina olivine tholeiite (HAOT) with low H sub(2)O (
ISSN:0010-7999
1432-0967
DOI:10.1007/PL00007657