none 10.1144/SP410.1 Geological Society of London Geological Society of London 1881 69872586 65091 2024072310103500855 10.1144 2024-07-24T01:12:08Z 2014-07-19T07:12:36Z 5 Geological Society, London, Special Publications SP 0305-8719 2041-4927 02 16 2015 01 2015 410 1 Georg F. Zellmer Soil &amp; Earth Sciences Group, Institute of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand Mineral Sciences, Smithsonian Institution, National Museum of Natural History, Washington, DC 20560-0119, USA Shyh-Lung Hwang Department of Materials Science and Engineering, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401, Taiwan, ROC Naoya Sakamoto Department of Natural History Sciences, Isotope Imaging Laboratory, Hokkaido University, Sapporo 060-0810, Japan Yoshiyuki Iizuka Institute of Earth Sciences, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 11529, Taiwan, ROC Sakiko Harada Department of Geosciences, Shimane University, Matsue 690-8504, Japan Jun-Ichi Kimura JAMSTEC, 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan Yoshihiko Tamura JAMSTEC, 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan Hisayoshi Yurimoto Department of Natural History Sciences, Isotope Imaging Laboratory, Hokkaido University, Sapporo 060-0810, Japan Abstract Pleistocene basalts from Daisen and Mengameyama in the SW Japan volcanic arc of western Honshu are characterized by an abundance of olivine crystals with Fe-rich rims. At Daisen, these have previously been interpreted to have formed from their host melt by equilibrium crystal fractionation and by disequilibrium fractionation during supercooling. Here we use combined electron probe microanalysis, isotopography, transmission electron microscopy and selected area electron diffraction to show that crystal rims are significantly enriched in aluminium (up to c. 1 wt%) and hydrogen (up to c. 10 000 ppm) hosted in oriented low-density amorphous domains. These domains are interpreted to have formed by melting of deuteric and/or post-deuteric metasomatic alteration minerals upon uptake of older olivine crystals into fresh, initially aphyric host melts up to a few hours prior to eruption. It is argued that uptake of variably altered crystals into initially aphyric or sparsely phyric melts may be a common process at subduction zones, and can account for typical disequilibrium textures displayed by arc magmas erupted in SW Japan and elsewhere. Analyses of the altered crystal cargo in arc volcanic rocks therefore provides an important tool for understanding subvolcanic hydrothermal systems and the interaction of ascending melts with such systems. Supplementary material: Olivine mineral chemistry data from two typical Daisen basalts and one typical Mengameyama basalt, and a figure showing the locations of all focussed ion beam (FIB) sections studied here, are available at http://www.geolsoc.org.uk/SUP18760 . 07 18 2014 01 2015 219 236 10.1144/SP410.1 https://doi.org/10.15223/policy-002 10.1144/SP410.1 https://www.lyellcollection.org/doi/10.1144/SP410.1 https://www.lyellcollection.org/doi/pdf/10.1144/SP410.1 https://pubs.geoscienceworld.org/books/book/1778/chapter/107673388/interaction-of-arc-magmas-with-subvolcanic https://pubs.geoscienceworld.org/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144/SP410.1&request=chapter 10.1016/j.pepi.2007.03.001 10.1016/S0031-9201(02)00044-4 10.1007/BF00371095 10.1007/BF00306412 10.1093/petrology/27.5.1157 10.1016/j.catena.2003.10.018 10.1093/petroj/40.1.105 10.1093/petrology/43.9.1651 10.1093/petrology/egh080 10.2113/gselements.3.4.253 10.1180/minmag.1985.049.354.07 10.1016/j.jvolgeores.2004.07.021 10.1029/GL005i006p00423 10.1007/BF00307281 10.1007/978-3-642-68012-0 10.1016/j.epsl.2006.06.014 10.1029/2007JB005274 American Mineralogist Huang W.-L. 683 79 1994 Dehydration and hydration of montmorillonite at elevated temperatures and pressures monitored using synchrotron radiation Huang W.-L., Bassett W. 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