Fluid Transfer in High-grade Metamorphic Terrains Intruded by Anorogenic Granites:

• Main Authors: The Thor Range, Kurt Bucher, B. Ronald Frost
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2003
• Subjects: Queen Maud Land; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.555.2256; http://petrology.oxfordjournals.org/content/47/3/567.full.pdf

A composite intrusive igneous complex in the central mountain range of Queen Maud Land (Thor Range), Antarctica, displays charac-teristic features of anorogenic granites. A suite of massive intrusives and various sets of dykes and satellite intrusions are ferroan, alkalic to alkali–calcic, and weakly peraluminous. An early set of plutons consists of charnockitic alkali-granites; a later group of plutons comprises fayalite Qtz-syenites. Coarse mesoperthite is the dominant mineral in all rocks, quartz is abundant and plagioclase is a minor mineral. Olivine (fayalite) is the characteristic mafic mineral, but subcalcic augite and occasionally pigeonite or orthopyroxene are present. In most samples, amphibole is the dominant mafic mineral and its composition is close to end-member hastingsite. It contains high concentrations of F and Cl. Some samples contain igneous fluorite. Thermobarometry suggests a temperature of 900 25C and a pressure of 04 01GPa for the crystallization conditions