Bladed quartz and its relationship to gold mineralization in the Hishikari low-sulfidation epithermal gold deposit, Japan

Jiro Etoh, Eiji Izawa, Koichiro Watanabe, Sachihiro Taguchi, Ryota Sekine

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Bladed quartz frequently is observed in low-sulfidation, epithermal gold deposits. Bladed calcite also has been documented in boiling zones of some active epithermal systems, and boiling in these systems has been directly linked to gold mineralization. In the Hishikari low-sulfidation epithermal gold deposit, the distribution and texture of fluid inclusions within bladed quartz reveal a similar relationship to gold precipitation. The formation of bladed quartz at Hishikari involves several stages: (1) deposition of bladed calcite; (2) precipitation of fine-grained adularia and quartz on the surface of calcites blades; (3) dissolution of calcite blades leaving cavities in the interstices between aggregates of adularia and quartz; and (4) infilling of the cavities by later quartz (i.e., pseudomorphs of the original bladed calcite). Bladed quartz is present largely in the deeper part of the vein system, beneath the high-grade gold ore zone at Hishikari. This distribution may be explained by the fact that the original bladed calcite formed at depth in the system, where boiling and loss of CO 2 initially caused the precipitation of the calcite, and quartz formed as pseudomorphs of the original calcite blades.

Original languageEnglish
Pages (from-to)1841-1851
Number of pages11
JournalEconomic Geology
Volume97
Issue number8
DOIs
Publication statusPublished - Dec 2002

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

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