Metabasites of the Cape Omega area, East Antarctica

• Main Author: Morihisa Suzuki
• Format: Report
• Language: English
• Published: Institute of Geology and Mineralogy, Faculty of Science, HiroshimaUniversity 1985
• Subjects: Cape Omega; East Antarctica; Prince Olav Coast; Antarc*; Antarctica; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1788; http://id.nii.ac.jp/1291/00001788/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1788&item_no=1&attribute_id=18&file_no=1

Metabasites in the Cape Omega area, the westernmost part of the Prince Olav Coast, are classified into two types, I and II. Type I contains clinopyroxene and Type II does not. Bulk chemical compositions of both types are characterized by the abundance in alkalies, especially (Na)_2O. The presence or absence of clinopyroxene is controlled by the bulk chemical composition, especially by the mole ratio of CaO/(FeO^*+MgO+MnO). Hornblende in Type I is characterized by the abundance of Si and (Al)^<VI> and poverty of Ti and K compared with that in Type II. The petrological and mineralogical characteristics of metabasites of the region from the Prince Olav Coast to Lutzow-Holm Bay show a systematic change, suggesting that the region has undergone westward progressive metamorphism.