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Abstract

The mineral chemistry of epidote and chlorite from the propylitic halo at El Teniente, in samples collected at distances up to 6.6 km from the deposit centre, was determined by microprobe and LA-ICP-MS analysis. Results show that both minerals incorporate a range of trace elements in a systematic way that define a much larger footprint to the system than is easily recognised using conventional means. In chlorite, geothermometry temperatures, Ti and V are high proximal and Li, As, Co, Sr, Ca and Y are low proximal (high distal); ratios of these elements define gradients towards ore varying over 3-5 orders of magnitude. In epidote, As defines a broad proximal low and is generally elevated at distances of at least 3 km from the edge of the ore shell. Zn, La, Yb, Y and Zr amongst others appear to define a geochemical shoulder that surrounds the deposit. These patterns are broadly similar to those observed in previous work at Batu Hijau and in the Baguio District suggesting that these minerals behave consistently and can therefore provide useful exploration tools within propylitic “green rocks”.

Item Type:	Conference Publication
Authors/Creators:	Wilkinson, JJ and Baker, M and Cooke, DR and Wilkinson, CC and Inglis, S
Keywords:	porphyry, copper, mineral, chemistry, chlorite, epidote, El Teniente
Journal or Publication Title:	Proceedings of the 14th SGA Biennial Meeting: Mineral Resources to Discover
Publisher:	Society for Geology Applied to Mineral Deposits
Copyright Information:	Copyright 2017 SGA
Related URLs:	UTAS Profile: Baker, MJ UTAS Profile: Cooke, DR
Item Statistics:	View statistics for this item

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