Geology, geochemistry, and geochronology of an A‐type granite in the Mulock Glacier area, southern Victoria Land, Antarctica

Abstract

On the north side of the Mulock

The record of Miocene climatic events in AND-2A drill core (Antarctica): Insights from provenance analyses of basement clasts

“…Other volcanic centres (but completely unroofed or submerged by now) represent other potential sources, as suggested by the occurrence of volcanic clasts within cored sedimentary strata possibly dating back to Early Oligocene (Sandroni and Talarico, 2004). In agreement with petrological and geochronological data reported by Di Vincenzo et al (2010) and consistently with paleo-glacial scenarios based on basement clast provenance (as described in the following sections), it is very likely that the recovered volcanic pebbles and cobbles could Findlay et al, 1984;Gunn and Warren, 1962;Skinner, 1982;Cook andCraw, 2001, 2002;Cottle and Cooper, 2006). Generalised ages for the major volcanic centres within the Erebus Volcanic Province are reported (Ma age data within brackets from Kyle, 1990;Cooper et al, 2007;Fargo et al, 2008;Martin et al, 2010) Kretz (1983), with the addition of Wm to indicate white mica.…”

“…3), and at Delta Bluff (Gunn and Warren, 1962). Mineral chemistry data from alkali-feldspar granitic clasts (Table 1a) closely match those reported for the Mulock Granite (X Mg = 0.073 and 0.082 for amphibole and biotite, respectively; Cottle and Cooper, 2006), and consequently a provenance from the Mulock Glacier area is considered more likely.…”

“…Clasts of alkalifeldspar granites and syenogranites can be sourced from the A-type granites reported by Read et al (2002) within the Koettlitz Glacier Alkaline Province, particularly from the K-feldspar rich granites present within the Glee Intrusives (Aslund, 1990;Cook and Craw, 2001). Southern more, alkaline granites are described in the northern side of Mulock Glacier (Mulock Granite), where they could represent an extensive intrusive complex cropping out from the Kehle Glacier to Cape Teall (Cottle and Cooper, 2006;Fig. 3), and at Delta Bluff (Gunn and Warren, 1962).…”

“…In the Mulock Glacier area, only aplite dykes are reported, usually tourmaline-bearing (Grindley and Warren, 1964;Cottle and Cooper, 2006).…”

Provenance signatures of the Antarctic Ice Sheets in the Ross Embayment during the Late Miocene to Early Pliocene: The ANDRILL AND-1B core record

“…To the southwest of the Mount Morning/Mount Discovery volcanic centers, in the Skelton Glacier-Mulock Glacier area, the lower greenschist to lower amphibolite metasedimentary rocks of the Skelton Group (Gunn and Warren, 1962;Cook and Craw, 2002) are intruded by minor alkaline-type quartz syenites and granites (Rowell et al, 1993) including a biotite ± hornblende porphyritic variety (Teall Island and Mulock Glacier area) (Cottle and Cooper, 2006a;Carosi et al, 2007). The lower greenschist metasedimentary rocks consist of a variety of lithologies (Skinner, 1982;Cook, 1997Cook, , 2007Cook and Craw, 2002) including white to grey metalimestones, metasandstones (including volcanoclastic varieties), quartzite, polymict metaconglomerate (carrying basaltic, rhyolitic and trachytic pebbles), and slightly deformed flows/sills of trachyte, quartzo-syenite, or basaltic composition (Cook, 2007).…”