Chang, Zhaoshan, Hedenquist, Jeffrey W., White, Noel C., Cooke, David R., Deyell, Cari L., and Garcia, Joey (2009) New tools for exploring lithocaps: example from the Mankayan intrusion-centered Cu-Au district, Philippines. In: Proceedings of the 10th Biennial Meeting of the the SGA 2009 (2) pp. 707-709. From: Smart Science for Exploration and Mining: 10th Biennial Meeting of the SGA 2009, 17-20 August 2009, Townsville, QLD, Australia.

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Abstract

The Lepanto high-sulfidation epithermal deposit is hosted in a lithocap that is genetically linked to the Far Southeast porphyry, with both deposits largely under cover. Several characteristics of the Lepanto lithocap were found in this study to change systematically with distance from the causative intrusion, although surface samples of the lithocap are mostly barren and do not define mineralogical or textural zonation patterns relative to the intrusive source. The alunite absorption peak at ~1480 nm in short-wavelength infra-red spectra shifts to higher wavelength positions in samples closer to the intrusive center. The alunite Pb content and Ag/Au ratio decrease towards the intrusive center, whereas Sr, La, Sr/Pb and La/Pb increase markedly. Whole-rock compositions, using only non-mineralized (Cu <0.1wt% and Au <0.1 ppm) and alunite-bearing samples, show that Pb, Hg, Ag, and Ag/Au decrease towards the intrusive center, and La/Pb and Sr/Pb ratios increase.

Item ID:	26292
Item Type:	Conference Item (Research - E1)
ISBN:	978-0-9805586-8-5
Keywords:	alunite, lithocap, high-sulfidation epithermal, porphyry, exploration
Related URLs:	Organisation
Date Deposited:	18 Jun 2013 05:47
FoR Codes:	04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes:	84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 100%
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