| Summary: | P(論文) The Belgica Mountains lie at the east end of the East Queen Maud Land, located at 72°18'S-72°43'S latitude and 30°57'E-31°20'E longitude. Crystalline basement rocks of this area are the Belgica group which is divided into the Belgica upper formation and the Belgica lower formation. Geological map and sections are given. Various rock types constitute the Belgica group : They are (1) granitic gneiss, (2) marble and skarn, (3) amphibolite, (4) hornblende-biotite gneiss, (5) augen gneiss, (6) clinopyroxene gneiss, (7) garnet-biotite gneiss, and (8) dyke rocks (basic-metadyke, syenite, granodiorite-diorite and pink granite). Brief petrography of these rock types includes 16 bulk chemical analyses. The results of 6 whole rocks K-Ar dating range from 382 to 472Ma suggesting that the metamorphism in these mountains occurred during the early Palaeozoic time. Gentle to open folds with wave length of several kilometers of two generations are developed throughout the region. departmental bulletin paper
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