Mustard, R., Kamenetsky, V.S., and Mernagh, T.P. (2003) Carbon dioxide bearing melt inclusions within a gold-mineralized felsic granite. In: Proceedings of the 7th Biennial SGA Meeting. pp. 351-354. From: Mineral Exploration and Sustainable Development, 24-28 August 2003, Athens, Greece.

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Abstract

Disseminated gold mineralization at Timbarra forms flat-lying ore bodies constrained beneath a fine-grained carapace within the core of a zoned 249-252 Ma I-type granite. Emplacement at mesozonal lev¬els (~7km) resulted in the development of a late stage volatile bearing (carbon dioxide-rich, chlorine-poor) magmatic fluid that was constrained by lithostatic conditions beneath a fine-grained 'quenched' carapace. The magmatic-hydrothennal fluids that ponded below the carapace formed unidirectional solidification textures (USTs), pegmatite lenses, miarolitic cavities, interconnected miarolitic cavities (IMTs) and vein-dykes. These variably gold-mineralized magmatic-hydrothennal transition textures contain carbon dioxide-bearing melt in¬clusions and low-salinity carbon dioxide-rich aqueous inclusions, whereas moderate to high-salinity aqueous inclusions are completely absent. The detection of carbon dioxide within melt inclusions using laser Raman spectroscopy is a significant observation supporting a magmatic origin for carbon dioxide in intrusion-related gold deposits.

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