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Preliminary Examinations of the Ore‐forming Process by Fluid Mixing – a Test of MIX99
Author(s) -
HOSHINO Kenichi,
YAMAMOTO Yuki,
GU Xiangping,
LEE Su Young,
WATANABE Makoto
Publication year - 2000
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2000.tb00068.x
Subject(s) - geology , seawater , hydrothermal circulation , mineralization (soil science) , mixing (physics) , geochemistry , mineralogy , precipitation , oceanography , soil science , physics , quantum mechanics , seismology , meteorology , soil water
Possible ore deposition by fluid mixing was preliminarily examined using MIX 99, a FORTRAN program developed for simulating water‐rock interactions. We consider mixing of two fluids, the low f O2 and high temperature source fluid and the high f O2 and low temperature seawater. Oxygen fugacity of a mixed fluid formed by titration of seawater into the source fluid gradually decreases with decreasing temperature (model A). Sequential precipitation of ore‐forming minerals was examined in this model. On the other hand, simultaneous precipitation of the minerals could be followed by simulation of instantaneous overall mixing of the two fluids (model B). Results of simulation of the both models revealed that a temporal sequence of mineralization observed in the Karuizawa mine, NE Japan, can be formed by model A, while model B is suitable for the mineralization of an active chimney found in the Rainbow hydrothermal area of the Mid‐Atlantic Ridge.