American Mineralogist, Volume 88, pages 611–623, 2003 Mass transfer and reaction paths in alteration zones around carbonate veins in the Nishisonogi Metamorphic Rocks, southwest Japan YASUSHI MORI,* TADAO NISHIYAMA,† AND TAKERU YANAGI Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 812-8581, Japan ABSTRACT This paper describes local mass transfer and fluid-rock interaction in epidote-blueschist subfacies basic schist around retrograde dolomite + calcite veins in the Nishisonogi Metamorphic Rocks, southwest Japan. The veins have alteration zones on both sides. The mineralogical and chemical changes during alteration were documented along two sample traverses normal to the veins. Ap- proaching the veins, the peak metamorphic assemblage (winchite + epidote + chlorite + calcite + albite + quartz) has been modified by progressive breakdown of amphibole, epidote, and calcite to illite and dolomite. Mass-balance calculations using the isocon method reveal that CO and K were added to the basic schists, and Ca was removed during alteration. The mass balance does not hold for these components between the vein + alteration zone and protolith as a whole. These findings suggest that the vein formation and metasomatism represent a process driven by fluid flow and long- distance element transport. Possible reaction paths between the
American Mineralogist – de Gruyter
Published: Apr 1, 2003
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