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Economic Geology; January 2001; v. 96; no. 1; p. 211-216; DOI: 10.2113/96.1.211
© 2001 Society of Economic Geologists
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Scientific Communications

PRECIPITATION OF GOLD IN A LOW-SULFIDATION EPITHERMAL GOLD DEPOSIT: INSIGHTS FROM A SUBMILLIMETER-SCALE OXYGEN ISOTOPE ANALYSIS OF VEIN QUARTZ

Ken-Ichiro Hayashi{dagger}, Tohru Maruyama and Hisao Satoh*

Department of Mineralogy, Petrology, and Economic Geology, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan

{dagger} Corresponding author: e-mail, khayashi{at}mail.cc.tohoku.ac.jp

The physical and chemical mechanisms of gold precipitation in the typical low- sulfidation epithermal gold deposit at Hishikari (southern Japan) were quantified by submillimeter-scale oxygen isotope analyses of vein quartz. In situ CO2 laser-ablated fluorination was used to measure temporal {delta}18O excursions. The calculated oxygen isotope compositions of the ore-forming fluid indicate a dynamic process of epithermal vein formation. Intermittent opening of the vein allowed introduction of metal-bearing deep fluid to the epithermal system, and associated boiling and subsequent mixing with meteoric water caused precipitation of precious metals.




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