The Fontaine Pluton: An early Ross Orogeny calc‐alkaline gabbro from southern Victoria Land, Antarctica

Detrital mineral ages from the Ross Supergroup, Antarctica: Implications for the Queen Maud terrane and outboard sediment provenance on the Gondwana margin

“…Alkaline magmatism continued into the early Cambrian (~530 Ma) in southern Victoria Land (Rowell et al, 1993;Cooper et al, 1997;Read et al, 2002;Mellish et al, 2002;Cottle and Cooper, 2006a), intruding deformed metasedimentary rocks. Calc-alkaline magmatism was prevalent between~530 and 480 Ma (Encarnación and Grunow, 1996;Allibone and Wysocazanski, 2002;Vogel et al, 2002;Paulsen et al, 2013), but may potentially have locally initiated as early as 545 Ma (Cottle and Cooper, 2006b;Stump et al, 2006;Goodge et al, 2012). Widespread emplacement of largely undeformed granites occurred after~500 Ma (Borg et al, 1990;Stump, 1995;Encarnación and Grunow, 1996;Allibone and Wysocazanski, 2002).…”

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

“…Sr-Nd isotope analyses by several workers (Cox et al 2000;Simpson 2002;Cottle & Cooper 2006, this issue) indicate a significant crustal component in the source area for many melts associated with the Ross Orogeny. Evolved rocks such as the Mulock Granite may therefore be considered to be, in part, a result of (lower) crustal anatexis, or arise by extreme fractionation of primitive magmas modified by crustal assimilation.…”

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

“…Exposures to the south between Mulock and Darwin glaciers are dominated by felsic granitoids (mainly post-tectonic granodiorites such as the Cooper Granodiorite, but also less extensive foliated porphyritic monzogranite) and minor mafic intrusions (e.g., Fontaine Pluton; Cottle and Cooper, 2006b). Further south, in the Britannia Range (between Darwin and Byrd glaciers), medium-to high-grade metasedimentary rocks (banded gneisses, schists with Ca-silicate layers, migmatites and minor amphibolite, marbles) and variably deformed (foliated to mylonitic) granitoids are common (Carosi et al, 2007).…”