Isotope geochemistry and petrology of granitoid suites from Granite Harbour intrusives of the Wilson Terrane, North Victoria Land, Antarctica
Isotope geochemistry and petrology of granitoid suites from Granite Harbour intrusives of the Wilson Terrane, North Victoria Land, Antarctica
European Journal of Mineralogy (February 1990) 2 (1): 103-123
An extended association of calc-alkaline granitic rocks crops out in North Victoria Land between the Campbell and David glaciers. This Cambro-Ordovician association shows a marked orogenic affinity. Three main suites are recognized: 1) the South Victoria Land intrusives of dominantly granodioritic plutons; 2) the Mt Abbott pluton to the E, mainly composed of syenogranites and intermediate rocks, and 3) widespread outcrops of gabbroic and monzogranitic intrusions in the N and W parts of the area, grouped in the Deep Freeze Range intrusives. Geochemical and isotopic data show that the variability observed may be due to fractional crystallization of relatively basic magmas, characterized by a marked crustal signature (40-70% crustal material involved in the genesis of the parent magmas). The process invoked could be similar to the melting-assimilation-storage-homogenization proposed for the Andean magmatism.
