Orthopyroxene-bearing rocks from the Tenmondai and Naga-iwa Rocks in the Prince Olav Coast, East Antarctica: First appearance of orthopyroxene in progressive metamorphic sequence

Orthopyroxene first appears in the Tenmondai and Naga-iwa Rocks in the progressive metamorphic sequence of the kyanite-sillimanite type from northeast to southwest along the Prince Olav and Soya Coasts, East Antarctica. Field occurrence and detailed petrography of three orthopyroxene-bearing rocks f...

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Bibliographic Details
Main Authors: Kazuyuki Shiraishi, Yoshikuni Hiroi, Hitoshi Onuki
Format: Report
Language:English
Published: National Institute of Polar Research/Institute of Earth Science, Faculty of Education, Kanazawa University/Department of Earth Sciences, Faculty of Science, Hirosaki University 1984
Subjects:
East Antarctica
Prince Olav Coast
Naga-iwa
Antarc*
Antarctica
Memoirs of National Institute of Polar Research
Polar Research
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1647
http://id.nii.ac.jp/1291/00001647/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1647&item_no=1&attribute_id=18&file_no=1
Description
Summary:Orthopyroxene first appears in the Tenmondai and Naga-iwa Rocks in the progressive metamorphic sequence of the kyanite-sillimanite type from northeast to southwest along the Prince Olav and Soya Coasts, East Antarctica. Field occurrence and detailed petrography of three orthopyroxene-bearing rocks from the bedrock exposures are presented in this paper. The mineral compositions as well as mineral textures suggest that the rocks are close to chemical equilibrium, that orthopyroxene was first produced in such manner (order) as is predicted experimentally and theoretically, and that the chemical compositions of the calcic amphiboles coexisting with orthopyroxene can be indicators of metamorphic grade.

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