Petrographic comparison of the Taylor and Victoria Groups (Devonian to triassic) in South Victoria Land, Antarctica

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Abstract
Detailed petrography of the Taylor Group is compared with the Victoria Group. The mature quartz arenites and subordinate subarkoses of the Taylor Group contrast with the immature subarkoses, lithic arkoses, and sublitharenites of the younger Victoria Group. Mechanical analyses indicate a littoral to fluvial environment of deposition for the Taylor Group and a fluvial environment for the Victoria Group. There is a marked provenance change from granitic or older quartzose sediment sources at the base of the Lashly Formation (Victoria Group) wherte volcanic lithic fragments appear and laumontite occurs. The presence of brown oxidised chlorites, possibly resulting from in situ weathering, is common throughout the Beacon Supergroup.