Gold-bearing Quartz Veins and Hydrothermal Alteration of the Paleozoic Epithermal System in the Francis Creek Area, North Queensland, Australia

Agung Harijoko, Koichiro Watanabe, Yoshinobu Motomura, Eiji Izawa

Research output: Contribution to journalArticle

Abstract

The Francis Creek area located at the Sybil graben in North Queensland, Australia, has some features of epithermal gold mineralization such as gold-bearing quartz vein and silica body hosted in rhyodacitic rocks of the Late Carboniferous Hells Gate Formation. In order to understand the nature of the paleo-hydrothermal activity in this area and to aid exploration for an economic gold deposit in this area, we carried out hydrothermal alteration mapping surrounding the veins and silica body, over an area of about 7 × 5 km2. We defined two alteration zones and inferred the center of hydrothermal activity. Fluid inclusion shows the boiling feature, and the microthermometry analysis resulted in the trapping temperature of 240°C and low salinity. This temperature is consistent with the formation temperature of clay mineral in the host rocks. On the basis of whole-rock composition, the silica body was identified as silicified rocks. Precious metal minerals such as electrum and acanthite coexist with sulfide minerals. Iodagylite was identified as a product of weathering. The sulfide minerals imply that the low-sulfidation epithermal gold mineralization occurred in the Francis Creek area.

Original languageEnglish
Pages (from-to)353-358
Number of pages6
JournalResource Geology
Volume52
Issue number4
DOIs
Publication statusPublished - Dec 1 2002

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Bearings (structural)
Quartz
quartz vein
hydrothermal alteration
Gold
Paleozoic
gold
Rocks
Silicon Dioxide
Sulfide minerals
silica
hydrothermal activity
mineral
sulfide
rock
mineralization
Gold deposits
temperature
precious metal
Weathering

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

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Gold-bearing Quartz Veins and Hydrothermal Alteration of the Paleozoic Epithermal System in the Francis Creek Area, North Queensland, Australia. / Harijoko, Agung; Watanabe, Koichiro; Motomura, Yoshinobu; Izawa, Eiji.

In: Resource Geology, Vol. 52, No. 4, 01.12.2002, p. 353-358.

Research output: Contribution to journalArticle

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