Comparison of Archean Complexes of the Murmansk Domain with Other Archean Complexes of the Baltic Shield, Greenland, and Canada

摘要

The Murmansk domain occupies the northeastern-most part of the Baltic Shield. It is overthrust onto litho-structural complexes of the Keivy and Central Kola domains in the southwest and subsides beneath the Barents Sea in the northeast. The continental part of the domain represents a narrow (about 40-60 km long) NW-trending marginal zone of the larger Archean cra-ton. The Murmansk domain consists of predominant Archean diorite-plagiogranites and enderbites as well as younger Archean plagiomicroline and microcline granites. These rocks are folded into a domal structure. Variably gneissic and migmatized plagio-granites contain numerous unevenly distributed xeno-liths of biotite, biotite-amphibole, and amphibole-biotite gneisses, as well as amphiboliltes, metagab-broids, and metaultramafic rocks.