Report on the New Zealand Antarctic Programme Event K110 1992/93 : regional geology of South Victoria Land, ''Olympus Range'' geological mapping

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Isaac, M.J.; Chinn, T.J.; Edbrooke, S.W.; Forsyth, P.J. 1993 Report on the New Zealand Antarctic Programme Event K110 1992/93 : regional geology of South Victoria Land, ''Olympus Range'' geological mapping. Lower Hutt: Institute of Geological & Nuclear SciencesInstitute of Geological & Nuclear Sciences science report 93/16 41 p.


Abstract: Event K110 of the 1992/3 Antarctic season continued the 1:50 000 geological mapping of southern Victoria Land, where three map sheets have been published, another two are in press, and one is in preparation. The results from the 1992/3 season will be integrated with those from the 1982/3 and 1984/5 seasons, to produce a map of the geology between the Asgaard and Clare ranges. Adjoining published sheets are Thundergut (1991) and St Johns (in press). Six major rock groups were mapped. The oldest is Koettlitz Group metasediment (Precambrian), which crops out in the eastern part of the map area. In the same area, several granitoid plutons and dike swarms (Granite Harbour Intrusives, early Ordovician) intrude the Koettlitz Group and each other. Beacon Supergroup sediments of the Taylor Group (Devonian) are present in the east and south, whereas the Victoria Group (upper Carboniferous to Triassic) occurs in the west and north of the mapped area. Ferrar Group dolerite sills (Jurassic) intrude all the above rock units and form the bulk of the Clare Range. Some possible extrusive rocks of the same group were seen near Mt Dearborn and Vishniac Peak. The youngest lithologies mapped are glacial and surficial deposits, which occur throughout the area but particularly in the valley floors. The positions of the termini of the Wright Upper and Victoria Upper glaciers were measured as part of the ongoing monitoring of these glaciers. (auths)