Gold-Bearing Quartz Veins And Hydrothermal Alteration Of The Paleozoic Epithermal System In The Francis Creek Area, North Queensland, Australia

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Journal Article: Gold-Bearing Quartz Veins And Hydrothermal Alteration Of The Paleozoic Epithermal System In The Francis Creek Area, North Queensland, Australia

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 hydrotbermal alteration mapping surrounding the veins and silica body, over an area of about 7 x 5 km(2). 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 240degreesC 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. lodagylite was identified as a product of weathering. The sulfide minerals imply that the low-sulfidation epithermal gold mineralization occurred in the Francis Creek area.

Authors 
A. Harijoko, K. Watanabe, Y. Motomura and E. Izawa








Published Journal 
Resource Geology, 2002





DOI 
Not Provided
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Citation

A. Harijoko,K. Watanabe,Y. Motomura,E. Izawa. 2002. Gold-Bearing Quartz Veins And Hydrothermal Alteration Of The Paleozoic Epithermal System In The Francis Creek Area, North Queensland, Australia. Resource Geology. (!) .