Insights into hydrothermal processes from cathodoluminescence and trace elements in quartz

Rusk, Brian (2010) Insights into hydrothermal processes from cathodoluminescence and trace elements in quartz. In: Proceedings of the 10th Biennial Meeting of the the SGA 2009 (2) pp. 749-751. From: 10th Biennial Meeting of the SGA 2009, 17-20 August 2009, Townsville, QLD, Australia.

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Scanning electron microscope-cathodoluminescent (SEM-CL) textures and the trace elements that cause them are used to fingerprint ore deposit types and infer physical and chemical histories of ore deposit formation. Porphyry copper deposits are distinguished by complex CL textures with evidence for superposition of multiple fluid flow events. Porphyry copper quartz contains more Ti than quartz from any other deposit type, consistent with higher formation temperatures. Epithermal deposits and Mississippi Valley Type (MVT) deposits are characterized by quartz with oscillatory euhedral growth zones. Epithermal quartz is typically more complex than MVT quartz with variations in crystal sizes and CL intensities as opposed to the consistent zoning observed in MVT quartz. Epithermal and MVT quartz are similar in composition; however, quartz from epithermal deposits typically contains a few tens of ppm of Sb, whereas MVT quartz contains a few tens of ppb Sb. Iron oxide copper-gold (IOCG) quartz and orogenic Au quartz are more difficult to distinguish based on trace elements alone, however orogenic Au quartz has homogenous CL textures with little observable variation in intensity. IOCG quartz has more complex textures including euhedrally zoned crystals. These two deposit types contain less total trace elements than any other deposit type analysed.

Item ID: 27696
Item Type: Conference Item (Research - E1)
ISBN: 978-0-9805-5868-5
Keywords: quartz, athodoluminescence, CL, trace elements, LAICPMS
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Date Deposited: 05 Jul 2013 04:24
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040201 Exploration Geochemistry @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840102 Copper Ore Exploration @ 100%
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