Abstract
A thick diorite-monzodiorite sheet over 2 km in length and up to 600 m in width (fig. 35) is exposed at 50°25'E and 63°55'N, about 7 km south of Qeqertaussaq by Kangerdluarssûngûp taserssua. Several diorite dykes, some over 10 m in thickness, tie parallel to the main body and up to 300 m from it. The north-east end of the body is covered by superficial deposits whilst the south-west part has not yet been mapped out. This is therefore a preliminary account, including petrography, fie1d relations and some geochemistry, and more information will become available during subsequent field seasons.
Highlights
A thick diorite-monzodiorite sheet over 2 km in length and up to 600 m in width is exposed at 50"25'E and 63°55'N, about 7 km south of Qeqertaussaq by Kangerdluarssungfip taserssua
Much of the main body and many of the dykes are dioritic in composition, comprising mainly plagioclase, clinopyroxene and biotite with small amounts of quartz, apatite, sphene, ilmenite and zircon; hypersthene occurs in one sample
In thin section the main fabric comprises an equigranular intergrowth of plagioclase, clinopyroxene and biotite, the mafic minerals together with ilmenite, sphene and apatite tending to form discrete clusters
Summary
A thick diorite-monzodiorite sheet over 2 km in length and up to 600 m in width (fig. 35) is exposed at 50"25'E and 63°55'N, about 7 km south of Qeqertaussaq by Kangerdluarssungfip taserssua. Much of the main body and many of the dykes are dioritic in composition, comprising mainly plagioclase, clinopyroxene and biotite with small amounts of quartz, apatite , sphene, ilmenite and zircon; hypersthene occurs in one sample. In thin section the main fabric comprises an equigranular intergrowth of plagioclase, clinopyroxene and biotite, the mafic minerals together with ilmenite, sphene and apatite tending to form discrete clusters. Leucocratic veins Several narrow (5-10 cm) sheets of syenitie eomposition are found in the diorite body and are clearly related genetically to it as they have not been found el ewhere in the region They eomprise eoarse paie green c!inopyroxene, partIy altered to green amphibole and quartz, mieroc!ine microperthite and quartz with small amount of apatite, ilmenite and biotite with trace of sphene and plagioc!ase (sample 153836, Table 10). Hypersthene appears in the eores of some c1inopyroxenes, apparently as relic of larger grain whieh have been extensively replaced by the diopside
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