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• W2039291242 abstract "Research Article| October 01, 1975 Origin of andesite and dacite: Evidence of mixing at Glass Mountain in California and at other circum-Pacific volcanoes JOHN C. EICHELBERGER JOHN C. EICHELBERGER 1Department of Geology, Stanford University, Stanford, California 943052Present address: Geosciences Group, Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87544 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1975) 86 (10): 1381–1391. https://doi.org/10.1130/0016-7606(1975)86<1381:OOAADE>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation JOHN C. EICHELBERGER; Origin of andesite and dacite: Evidence of mixing at Glass Mountain in California and at other circum-Pacific volcanoes. GSA Bulletin 1975;; 86 (10): 1381–1391. doi: https://doi.org/10.1130/0016-7606(1975)86<1381:OOAADE>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The intimate association of basalt, andesite, dacite, and rhyolite within a volcanic center suggests that these rocks are genetically related. Individual lava flows that show a gradation in composition may preserve maximum evidence of the magmatic processes producing this association. One such flow of rhyolite to dacite composition, Glass Mountain in northern California, was formed by contamination of rhyolite magma as it intruded the basaltic flows of the Medicine Lake Highland shield volcano. Although dacite flows and domes commonly show less variation in composition than the Glass Mountain flow, many show similar evidence of contamination by basalt by the presence of abundant basaltic inclusions and phenocrysts and phenocryst clots from those inclusions. Similarly, many andesite flows contain rhyolitic inclusions, rhyolitic bands, and phenocrysts appropriate to rhyolite. These observations indicate that andesite and dacite are hybrid rocks that are formed when rising primary basalt and rhyolite magmas either become contaminated with the glassy debris of the volcanic pile or mix with each other directly. Linear variation in bulk composition, phenocryst assemblages of intermediate rock, and frequency distribution of lava compositions in the southern Cascade Range, Chilean Andes, Taupo volcanic zone, and Tongan Islands support this hypothesis. It appears that partial melting usually produces magma of rhyolitic and basaltic compositions and that any subsequent fractional crystallization is of limited importance. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2039291242 title "Origin of andesite and dacite: Evidence of mixing at Glass Mountain in California and at other circum-Pacific volcanoes" @default.
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