Computer Science
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..535k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 3, pp.535-540
Computer Science
2
Scientific paper
Clinoamphibole present in shallow intrusive masses of quartz diorite in the Daito-Yokota area of the San-in belt, southwest Japan, is strongly zoned successively from a magnesio-homblende core to an actinolite rim, systematically decreasing in Fe 2+ /( Fe 2+ + Mg ) towards the rim. The features of compositional variation and cation substitution are similar to those of amphiboles which have been altered by fluid separated during secondary boiling in porphyry copper-bearing granitoids. Mineralogie data and textural relations of amphibole and the accompanying minerals indicate that the zoned amphibole has crystallized or recrystallized from a subsolidus fluid phase under progressively oxidizing conditions. Truly magmatic amphibole is restricted to small patches in the core of strongly zoned amphibole grains. Progressive oxidation is responsible for reequilibration of early-formed Fe-Ti oxide to yield extensive development of secondary magnetite and sphene. The decreasing Fe trend of amphibole has resulted from progressive Fe depletion of the fluid phase by abundant magnetite precipitation. The amphibole grains usually show an alternation of chemically distinct zones with unconformable boundaries, indicating repeated growth and corrosion by multiple circulation of fluids.
Kawakatsu Kazuya
Yamaguchi Yoshiaki
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