Hornblende peridotite xenoliths from central Mexico reveal the highly oxidized nature of subarc upper mantle

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Research Article| November 01, 1998 Hornblende peridotite xenoliths from central Mexico reveal the highly oxidized nature of subarc upper mantle Dawnika L. Blatter; Dawnika L. Blatter 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Ian S. E. Carmichael Ian S. E. Carmichael 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Author and Article Information Dawnika L. Blatter 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Ian S. E. Carmichael 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (11): 1035–1038. https://doi.org/10.1130/0091-7613(1998)026<1035:HPXFCM>2.3.CO;2 Article history First Online: 02 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 Dawnika L. Blatter, Ian S. E. Carmichael; Hornblende peridotite xenoliths from central Mexico reveal the highly oxidized nature of subarc upper mantle. Geology 1998;; 26 (11): 1035–1038. doi: https://doi.org/10.1130/0091-7613(1998)026<1035:HPXFCM>2.3.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 SocietyGeology Search Advanced Search Abstract Quaternary hornblende andesites have erupted along a fault zone near El Peñon, central Mexico. One of these flows contains 1–2 cm xenoliths of amphibole-rich spinel lherzolite and chromite websterite. These xenoliths are rare samples of subarc upper mantle from a region of continuing subduction, and they are the most oxidized mantle peridotites yet described (fayalite-magnetite-quartz +1.5 to 2.4). The abundant amphibole and high oxygen fugacities that characterize these xenoliths are significant because they provide direct evidence for metasomatism of the mantle wedge by slab-derived fluids. Phenocrysts of hornblende and lack of plagioclase phenocrysts in the host andesite indicate that it equilibrated with high water content (>8 wt%), and the presence of xenoliths implies rapid (26 km/day) ascent. 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.