Hydrocarbon-bearing fluid inclusions in the Drau Range (Eastern Alps, Austria): Implications for the genesis of Bleiberg-type Pb-Zn deposits

Gerd Rantitsch, J. Jochum, Reinhard F. Sachsenhofer, Barbara Russegger, Erich Schroll, Brian Horsfield

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Abstract

Hydrocarbons in ore minerals of Bleiberg-type Pb-Zn deposits and in authigenic quartz of the Drau Range (Eastern Alps) have been analysed by bulk-sample gas chromatography and fluorescence microscopy. Microthermometric data and the molecular composition of the hydrocarbons indicate a hot (120° to 130°C) pulse of migrating condensate-like hydrocarbons within Late Triassic sediments during Middle Cretaceous to Early Tertiary times. The molecular composition of hydrocarbons enclosed in authigenic quartz corresponds to the composition of hydrocarbons trapped in Bleiberg-type ore minerals, therefore a common fluid source is assumed. The hydrocarbons possibly played an important role as reducing agents in the late stage of sulfide precipitation.
Original languageEnglish
Pages (from-to)141-159
Number of pages19
JournalMineralogy and Petrology
Volume65.1999
Issue number3-4
DOIs
Publication statusPublished - Sept 1999

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