Metabasites of the Cape Omega area, East Antarctica
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...
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| Format: | Report |
| Language: | English |
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Institute of Geology and Mineralogy, Faculty of Science, HiroshimaUniversity
1985
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| 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 |
| Summary: | 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. |
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