YUKON EXPLORATION AND GEOLOGY 2004 227 The isotopic sulphur composition of two barite samples
The Rose Mountain area northwest of Faro is underlain by a succession of phyllites, cherts, sandstones, chert-pebble conglomerates and basalt belonging to the Slide Mountain Terrane. At least two, laterally extensive, massive barite horizons are interbedded with phyllite, bedded chert, sandstone and...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.543.9971 http://publications.gc.ca/collections/Collection/R71-41-2004E(20).pdf |
| Summary: | The Rose Mountain area northwest of Faro is underlain by a succession of phyllites, cherts, sandstones, chert-pebble conglomerates and basalt belonging to the Slide Mountain Terrane. At least two, laterally extensive, massive barite horizons are interbedded with phyllite, bedded chert, sandstone and chert-pebble conglomerate of the Early Carboniferous Mount Aho formation, the lowermost unit in this succession. Samples from two barite horizons produced δ34S values (‰) of +14.3 ± 0.2 (2σ) and +13.8 ± 0.2 (2σ), which are consistent with δ34S values for coeval dissolved sulphate in seawater. Ambient seawater is therefore the most probable source of the sulphate in the barite. The results suggest barite precipitated from mixing of sulphate-poor hydrothermal fluids with ambient seawater rather than inversion of anoxic, stagnant, stratified basin waters. RÉSUMÉ La région du mont Rose, au nord-ouest de Faro, repose sur une succession de phyllites, de cherts, de grès, de conglomérats de galets de chert et de basalte appartenant au terrane de Slide Mountain. Une stratification entremêlée de phyllite, de chert lité, de grès et de conglomérat de galets de chert, appartenant à la formation de Mount Aho du Carbonifère précoce, forment les couches |
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