Synchrotron X-ray fluorescence analysis of zoned carbonate gangue in Mississippi Valley-type deposits (U.S.A.)

Abstract. Laser Raman microprobe analysis was performed on the fluid inclusions from the Honko‐Sanjin zone in the Hishikari epithermal gold deposit, southern Kyushu, Japan. Gas concentrations of fluid inclusions through the zone were below detection limits (e.g., 5 mmole/kg H 2 O for CO 2 ), with an exception at shallow portion in which the CO 2 /N 2 mole ratio was determined to be 5.3. Boiling of hydrothermal solutions probably separated gases from ore fluids at the deep portion of the deposit, and migration of gases to shallow portion resulted in CO 2 ‐rich steam‐heated water and related acid alteration.

Microprobe

10.1111/j.1751-3928.2002.tb00150.x

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