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- W2093426142 abstract "A metamorphosed hydrothermal eruption breccia (conglomerate) has been found in recently opened galleries in the western field of the Felbertal scheelite deposit. It belongs to the K2 ore body and covers a stratiform quartz mass and surrounding host rocks. The quartz mass shows features very similar to siliceous sinters in recent explosion craters (e.g., Waiotapu, New Zealand). The breccia displays a variable thickness, commonly up to 60 cm. It is continuous for at least 100 m along strike and is composed of rock fragments from the surrouding and underlying host rocks, including basaltic, felsic and quartz rocks. These fragments reveal a variable degree of rounding due to subaqueous reworking and an elongation due to tectonism and metamorphism. With increasing distance from the quartz mass the quantity of rock fragments in the breccia diminishes rapidly. Laterally, the metamorphosed breccia (conglomerate) horizon interfingers with (biotite) amphibolites. This breccia indicates (1) at least one hydrothermal eruption, (2) the existence of a subaqueous erosional surface, (3) the ejection of underlying and surrounding host rocks of the scheelite-bearing series, (4) the pre-existence of the quartz mass and a bimodal rock assemblage including basaltic and felsic volcanites with an earlier tungsten mineralization mainly in quartz fragments, and (5) a tungsten mineralization coeval with the formation of the matrix. This matrix shows enrichments in W, Sn, Mo, Li, Be, Au, Bi, As, F, P, Ba, Th and U." @default.
- W2093426142 created "2016-06-24" @default.
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- W2093426142 date "1988-11-01" @default.
- W2093426142 modified "2023-09-25" @default.
- W2093426142 title "Metamorphosed hydrothermal eruption breccia (conglomerate) in the Felbertal scheelite deposit, Eastern Alps, Austria" @default.
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- W2093426142 doi "https://doi.org/10.1016/0025-3227(88)90106-5" @default.
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