東南極大陸,Enderby LandのSandercock Nunatak群の地質について(日本南極地域観測隊の報告)

• Main Authors: 白石 和行, 渡辺 興亜, 木崎 甲子郎, Kazuyuki SHIRAISHI, Okitsugu WATANABE, Koshiro KIZAKI
• Format: Report
• Language: Japanese
• Published: 北海道大学理学部 1972
• Subjects: 551.1/.4:552; Antarctic; Queen Maud Land; Bukt; Sandercock Nunataks; Antarc*; Enderby Land
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7688; http://id.nii.ac.jp/1291/00007688/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7688&item_no=1&attribute_id=18&file_no=1

The Sandercock. Nunataks (68°33'S, 52°07'E) are composed of several small nunataks which are tentatively named A, B, C and D. Nunatak "A" consists mainly of hornblende-biotite gneiss and Nunatak "B" of hypersthene-garnet gneiss and garnet gneiss. Nunatak "C" is composed of hypersthene-hornblende gneiss. They are associated with aplites, pegmatites and metabasites. The petrographic observations under the microscope reveal that the unstable hypersthene signifies the transition of the granulite facies conditions to the amphibolite facies conditions. The transition is not unusual throughout the East Antarctic platform, particularly in the Lutzow-Holm Bukt area and Queen Maud Land.