On the Scapolite-Plagioclase Equilibrium Found in the Cape Omega and East Ongul Island Areas, East Antarctica

• Main Author: Morihisa Suzuki
• Format: Report
• Language: English
• Published: Institute of Geology and Mineralogy, Faculty of Science, Hiroshima University 1979
• Subjects: East Antarctica; Ongul; Ongul Island; East Ongul Island; Cape Omega; Antarc*; Antarctica; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1028; http://id.nii.ac.jp/1291/00001028/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1028&item_no=1&attribute_id=18&file_no=1

The association of scapolite and plagioclase from the Cape Omega and East Ongul Island areas of East Antarctica is briefly discussed with special reference to the petrogenetic significance. In the former area, the association is found in metabasites enclosed in the amphibolite facies metamorphites and pink granite. In the latter area, the association is observed in the feldspathic rock, which seems to be emplaced in the granulite facies rocks. Based on the mineralogical investigations, the association in the Cape Omega area suggests the equilibration under the granulite facies, while that in East Ongul Island under the amphibolite facies or lower. Summarizing the geological and petrological characters of the metamorphites concerned, the time and space relationship of metamorphic processes between the two areas are discussed.