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- W7683204 abstract "The Que River Shale Fonnation overlies the Que-Hellyer Volcanics, which are the hostsequence to the Hellyer and Que River massive sulphide deposits, western Tasmania.The Que River Shale is a homogeneous unit of finely laminated, fine grained (<100um)quartz, muscovite and calcite grains in a dirty brown chloritic matrix. The shale contains intercalatedresedimented volcaniclatic sandstones at the top and base of the unit. Shale composition varies by lessthan 5 wt % with regards to major elements.Deposition of the Que River Shale began after the fonnation of the Hellyer Massive sulfidedeposit but contemporaneous with the mixed sequence. Shale deposition extended throughout the endof deposition of the Mount Charter group, synchronous with the Southwell Subgroup volcanism.However the erruption of Upper Basalts and Andesites and the influx of predominantly rhyoliticvolcaniclastic mass-flows and turbidites associated with the Southwell Subgroup restricted the finelylaminated shale mostly to a period of quiesence between the two styles of volcanism.The depositional environment of the Que River Shale is interpreted to represent quiet,reducing bottom waters, due to a high proportion of complete agnostid trilobite specimems along withthe presence of carbonaceous material and pyrite nodules. Geochemical techniques have been used tofurther define the basin as inhospitable (little or no oxygen present) to euxinic (free H2S). While Sisotopesrange from o34S + 17 to +43 suggesting that the sediment may have been a closed system withrespect to S04 z. ans H2S.The Que River Shale has an andesitic provenance suggesting a local source for the shale.However, the Que River Shale cannot be derived directly from any one source, or combination ofsources in the Mount Read Volcanics without significant modification The only quantification thatcan be placed on the source rocks is that the Que River Shale must contain 20-25% Hellyer Basalt, toobtain the high Cr values observed (up to 1.3 wt % Cr203). The Que River shale must havebeen wellhomogenised by sedimentary processes to account for its restricted range in chemical compositionThe Que River shale does not show an extensive alteration plume unlike the underlyingbasalts. Alteration in the suite therefore cannot be used as an exploration indicator. However,anomalous base metal values (up to 400 ppm Pb and 938 ppm Zn) are spatially association to theorebody and may be useful as vectors to mineralisation." @default.
- W7683204 created "2016-06-24" @default.
- W7683204 creator A5031858658 @default.
- W7683204 date "1994-11-01" @default.
- W7683204 modified "2023-09-27" @default.
- W7683204 title "Geology and geochemistry of the Que River shale,Western Tasmania" @default.
- W7683204 hasPublicationYear "1994" @default.
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