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Abstract
The Sangkaropi district in central-West Sulawesi is one of the few known volcanic hosted massive sulfide (VHMS) districts in Indonesia. It comprises several clusters of mostly small mineral occurrences, including Sangkaropi, Billolo and Rumanga. The mineralization is hosted by felsic volcanics that occur in bimodal association with basalt. Styles of mineralization include syngenetic banded massive and fragmented sulfides and epigenetic veins, stockwork and disseminations. The deposits are classified as zinciferous bimodal-felsic (Kuroko type) VHMS.We present for the first time preliminary results for whole rock and trace element analysis and U-Pb age dating for the bimodal volcanic hosts, together with sulfur isotope data for the mineralization and associated barite alteration. Combined with previous data, this new information suggests the mineralization in the Sangkaropi district took place around 34 Ma (boundary Eocene-Oligocene) in a continental margin arc setting, when the stress regime changed from near-neutral to extensional and volcanism changed from being andesite-dominated to bi-modal. The sulfur isotope data suggest that the mineralizing fluids had both significant magmatic and seawater components.
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