SEM-CL and LA-ICP-MS trace element analysis of cassiterite in Gejiu tin district, SW China

Cheng, Yanbo, Rusk, Brian, Kemp, Tony, and Mao, Yingwen (2011) SEM-CL and LA-ICP-MS trace element analysis of cassiterite in Gejiu tin district, SW China. In: Proceedings of the Eleventh Biennial SGA meeting: Let's Talk Ore Deposits. A106. pp. 325-327. From: Let's Talk Ore Deposits: Eleventh Biennial SGA Meeting, 26-29 September 2011, Antofagasta, Chile.

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Scanning electron microscope-cathodoluminescence images of cassiterite from various ore deposits in the Gejiu tin disrict, SW China reveal microstructures that differ among samples from different mineralizing environments. Cassiterite grains derived from granites and granite-proximal skarns and greisens are commonly larger in size, with clear euhedral oscillatory growth zones. In vein, stratiform oxidized and stratiform semioxidized samples, which are distal to the source granites, cassiterites are generally smaller, anhedral, and zonings are less evident. LA-ICP-MS trace element analyses indicate Ti, Fe and W are the most abundant trace elements in the samples of this study and Al, Sc, V, Ga, Zr, Nb, and Sb are commonly in lower concentrations. V, Nb, W and U have significant variations in concentration in a single sample. The skarn, greisen and tin granite samples have higher Ti, V and Al concentrations than vein-hosted, stratiform semioxidized and stratiform oxidized cassiterite. Trace element variations may reflect the distance between the granite-derived source fluids and the hydrothermal orebodies. In a tin granite cassiterite grain, the concentrations of Nb, U, Sb, W, Sc, V, Ti and Fe increase from core to rim of the crystal, but the greisen cassiterite does not show the same element zonation.

Item ID: 25496
Item Type: Conference Item (Research - E1)
ISBN: 978-956-287-329-1
Keywords: cassiterite, SEM-CL, trace element, LAICPMS, Gejiu
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Date Deposited: 13 Mar 2013 05:30
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%
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