MICROSTRUCTURE AND PHASE TRANSITION OF CALCIC ANORTHOCLASE FROM MOUNT EREBUS, ANTARCTICA

Monoclinic-triclinic inversion and exsolution phenomena in calcic anorthoclase were investigated by means of high temperature X-ray diffraction, X-ray microprobe analysis and analytical transmission electron microscope on natural calcic anorthoclase from Mout Erebus, Antarctica. Mt. Erebus anorthocl...

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Bibliographic Details
Main Authors: タガイ トクヘイ, タケダ ヒロシ, タチカワ オサム, カミヌマ カツタダ /, Tokuhei TAGAI, Hiroshi TAKEDA, Osamu TACHIKAWA, Katsutada KAMINUMA, P.R. KYLE
Format: Report
Language:English
Published: Mineralogical Institute, Faculty of Science, University of Tokyo 1987
Subjects:
Mount Erebus
Antarc*
Antarctica
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2533
http://id.nii.ac.jp/1291/00002533/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2533&item_no=1&attribute_id=18&file_no=1
Description
Summary:Monoclinic-triclinic inversion and exsolution phenomena in calcic anorthoclase were investigated by means of high temperature X-ray diffraction, X-ray microprobe analysis and analytical transmission electron microscope on natural calcic anorthoclase from Mout Erebus, Antarctica. Mt. Erebus anorthoclase is the most calcic one-phase anorthoclase which was twinned according to the albite-and pericline-laws in the course of monoclinic-triclinic inversion, whose temperature was measured to be 750℃. The occurrence of the one-phase anorthoclase was closely related with the eruption mechanism of Mt. Erebus.

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