none 10.1180/minmag.2012.076.3.14 Mineralogical Society The Mineralogical Society 7149 56308791 5840 2021020408545850492 10.1180 2021-02-04T04:56:28Z 2012-07-02T20:06:09Z 5 Mineralogical Magazine Mineral. mag. 0026-461X 1471-8022 06 2012 76 3 T. Miyazoe M. Enami T. Nishiyama Y. Mori Abstract Strontium-rich epidote, including epidote-(Sr) and epidote with major amounts of Sr (i.e. epidote containing up to 17.3 wt.% SrO), was found in pumpellyite schist and epidote blueschist in a tectonic block in the serpentinite mélange of the Kurosegawa Zone, central Kyushu, Japan. The tectonic block is 20 m wide and made primarily of lawsonite blueschist, with subordinate amounts of pumpellyite schist and epidote blueschist. The pumpellyite schist typically occurs at the edge of the block and is composed mainly of pumpellyite with subordinate amounts of strontium-poor epidote, albite and chlorite, and thin veins of fine-grained calcite and clinopyroxene. Epidote-(Sr) forms rims around strontium-poor epidote, fills fractures in strontium-poor epidote and also occurs interstitially between pumpellyite aggregates and along the boundaries between pumpellyite and calcite-clinopyroxene veins. The epidote blueschist is found between the pumpellyite schist and lawsonite blueschist, and consists mainly of sodic amphibole, epidote and titanite, with albite veining. Strontium-rich epidote occurs as rims, replacing Sr-poor epidote near the albite vein. The bulk strontium contents of the rocks are as follows: lawsonite blueschist (200 ppm), epidote blueschist (2800 ppm) and pumpellyite schist (~10,700 ppm). The chemical and petrological characteristics of the Sr-rich epidote-bearing metabasites suggest that the infiltration of a metamorphic fluid promoted extensive Sr metasomatism during the later stages of high-pressure metamorphism. 07 05 2018 06 2012 635 647 S0026461X00005594 https://www.cambridge.org/core/terms 10.1180/minmag.2012.076.3.14 https://www.cambridge.org/core/product/identifier/S0026461X00005594/type/journal_article https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0026461X00005594 http://www.ingentaconnect.com/content/minsoc/mag/2012/00000076/00000003/art00014 http://minmag.geoscienceworld.org/cgi/doi/10.1180/minmag.2012.076.3.14 10.2138/am.2010.3371 10.2138/am.2009.2931 Mori, Y. and Mashima, H. (2005) X-ray fluorescence analysis of major and trace elements in silicate rocks using 1:5 dilution glass beads. Bulletin of Kitakyushu Museum of Natural History and Human History, Series A, 3, 1—12 Mitteilungen Tschermaks Mineralogische und Petrographisch 34 87 1985 Brastad 10.1111/j.1440-1738.2007.00557.x Treatise on Geochemistry 2003 Klein Geology Interactions between serpentinite devolatization, metasomatism and strike-slip strain localization during deep-crustal shearing in the Eastern Alps. Journal of Metamorphi 22 283 2004 Barnes Mineralogist Al-Fe3+ and Ca-Sr2+ epidotes in metagreywacke-quartzofeldspathic schist, Southern Alps, New Zealand. America 69 490 1984 Grapes 10.2747/0020-6814.47.1.24 10.2138/am.2007.2353 10.2138/am-1998-3-407 Mineralogist Nomenclature of amphiboles; report of the subcommittee on amphiboles of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadia 35 219 1997 Leake Sciences Epidote-(Sr), CaSrAl2Fe3+(Si2O7) (SiO4)(OH), a new mineral from the Ananai mine, Kochi Prefecture, Japan. Journal of Mineralogical and Petrologica 103 400 2008 Minagawa 10.1007/s00710-005-0074-8 10.1111/j.1525-1314.1994.tb00003.x Saito, M. , Miyazaki, K. , Toshimitu, S. and Hoshizumi, H. (2005) Geology of the Tomochi district. Quadrangle Series, 1: 50,000. Geological Survey of Japan (AIST), Japan, 218 pp., [in Japanese with English abstract]. 10.2138/am.2007.2401 10.1007/BF00310644 Memoirs of Geological Society of Japan Protolith and Sm-Nd geochronology of garnet-clinopyroxene granulite and garnet-amphibolite from the Kurosegawa Belt in Kyushu, southwest Japan 56 199 2000 Osanai Geology An internally consistent thermodynamic data set for phases of petrological interest. Journal of Metamorphi 16 309 1998 Holland southern west Japan 1977 Karakida 10.1016/j.precamres.2007.09.004 Sciences Niigataite, CaSrAl3(Si2O7) (SiO4)O(OH): Sr-analogue of clinozoisite, a new member of the epidote group from the Itoigawa- Ohmi district, Niigata Prefecture, central Japan. Journal of Mineralogical and Petrologica 98 118 2003 Miyajima 10.1016/S1342-937X(05)70652-3 Journal of Science Multivariable phase diagrams: an algorithm based upon generalized thermodynamics. America 290 666 1990 Connolly Review Serpentinite subduction: implications for fluid processes and trace-element recycling. International Geolog 46 595 2004 Scambelluri Magazine Itoigawaite, a new mineral, the Sr analogue of lawsonite, in jadeitite from the Itoigawa-Ohmi district, central Japan. Mineralogica 63 909 1999 Miyajima