THE STABILITY FIELD OF AMPHIBOLE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA : IMPLICATION FOR THE EMPLACEMENT DEPTH OF SYENITE MAGMA

• Main Authors: オオバ タカノブ, シライシ カズユキ, Takanobu OBA, Kazuyuki SHIRAISHI
• Format: Report
• Language: English
• Published: Department of Geoscience, Joetsu University of Education 1995
• Subjects: East Antarctica; Yamato; Sør-Rondane; Sør Rondane Mountains; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2788; http://id.nii.ac.jp/1291/00002788/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2788&item_no=1&attribute_id=18&file_no=1

By using the stability field of amphibole in the melting experiments, we attempt to estimate the emplacement depth of amphibole-bearing syenites from the Sør Rondane Mountains. The melting relationships of four syenites and one granite were determined in the temperature range of 650-900℃ under water pressure of 0.1-0.3GPa and oxygen fugacities of the FMQ buffer. In two syenites and a granite, the maximum pressure stability limit of amphiboles in subliquidus is lower pressure than 0.35GPa. The emplacement depth of the syenites from the S∅r Rondane Mountains is similar to that of syenites from the Yamato Mountains.