Petrology of A-type hornblende granite and fayalite granite enclaves from cDML, East Antarctica: Some constraints on their origin

摘要

The Skorvestallen batholith intrusive into granulitic crust consists of dominant coarse-grained pink granite, small rounded bodies of greenish grey fayalite granite, stocks of grey porphyritic biotite granite and porphyritic fayalite granite. These weakly peraluminous granites show A-type signatures with characteristic high Fe/(Fe + Mg), Ti/Mg, HFSE such as Y and Zr, LREE and Zn. The granites crystallized at high temperatures and were emplaced at mid-crustal pressures. The paper discusses their possible mode of origin based on petrochemical studies.