Immiscible iron- and silica-rich melts and magnetite geochemistry at the El Laco volcano (northern Chile): Evidence for a magmatic origin for the magnetite deposits
作者: Francisco VelascoFernando TornosJohn M. Hanchar
作者单位: 1Departamento de Mineralogía y Petrología, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU, 48080 Bilbao, Spain
2 Centro de Astrobiología (CSIC-INTA), Ctra. Ajalvir, km 4.5, 28850, Torrejón de Ardoz, Madrid, Spain
3 Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador A1B 3X5, Canada
刊名: Ore Geology Reviews, 2016, Vol.79 , pp.346-366
来源数据库: Elsevier Journal
DOI: 10.1016/j.oregeorev.2016.06.007
关键词: Magnetite-apatiteEl LacoChileAndesiteMelt immiscibilityMelt inclusions
英文摘要: Abstract(#br)The Pliocene El Laco volcano (northern Chile) hosts a large iron oxide deposit that occurs as stratiform bodies with underlying feeder zones (dykes) hosted by hydrothermally altered andesite lava flows. Phenocrysts in the andesite hosting the mineralization have abundant melt inclusions displaying strong evidence for melt immiscibility. Most of the pyroxene and the plagioclase phenocrysts contain abundant Fe-rich melt inclusions with low-Ti magnetite, pyroxene, apatite, and minor anhydrite. The glassy groundmass of these melt inclusions is chemically similar to sub-alkaline rhyolitic rocks (e.g., >70% SiO 2 ; Si-Al-K-Na-rich). Large resorbed plagioclase phenocrysts also host another group of melt inclusions with a similar silica-rich groundmass but hosting...
全文获取路径: Elsevier  (合作)
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影响因子:2.417 (2012)

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关键词翻译
关键词翻译
  • magmatic 岩浆的
  • geochemistry 地球化学
  • magnetite 磁铁矿
  • immiscibility 不溶混性
  • origin 起原
  • volcano 火山
  • apatite 磷灰石
  • silica 硅土