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Title

The Late Cretaceous Epithermal Beqtakari Prospect; Bolnisi Mining District, Georgia, Lesser Caucasus
Authors
Lavoie, Jonathan
Moritz, Robert
Popkhadze, Nino
Spangenberg, Jorge
Published in Porphyry and epithermal deposits. 2015
Description vol 1; 313-316
Abstract Beqtakari is a Au-Ag-Zn-Pb ± Cu prospect located in the Bolnisi mining district of Georgia, Lesser Caucasus. It is hosted by an intermediate to felsic calcalkaline volcanic system of Upper Cretaceous age. This study focuses on mineralogical and petrography observations and stable isotope analysis based upon detailed fieldwork mapping combined with drill core logging in order to characterize the volcanic lithofacies and the mineralizing fluid conditions. The mineralization is divided in two zones, the Au-Ag-rich zone, which is hosted in a strongly silicified rhyodacite and the precious and polymetallic mineralization which is hosted in hydrothermally altered autobreccia. Late dikes related to a rhyodacitic dome are cross-cutting the Au-Ag-rich unit. The latter mineralization is covered by a welded tuff unit called the proximal sub-formation of Gasandami. The genetic relationship of this proximal sub-formation with the silicified rhyodacitic unit remains to be determined. Sulphur isotope results from the mineralization stage shows distinct values between sulphates and sulphides. Geothermometry using δ34S of sulphate-sulphide pairs yield higher temperature than expected, implying reequilibrium or disequilibrium.
Keywords Epithermal environment — Lesser Caucasus — Silicic lava and dome — Sulphur isotope
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Structures
Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre
Research group Mineral Ressources and Geofluids
Citation
(ISO format) 		LAVOIE, Jonathan et al. The Late Cretaceous Epithermal Beqtakari Prospect; Bolnisi Mining District, Georgia, Lesser Caucasus. In: Porphyry and epithermal deposits. [s.l.] : [s.n.], 2015. https://archive-ouverte.unige.ch/unige:75037

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Deposited on : 2015-09-07

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