PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION
Pseudotachylite from McIntyre Island in Enderby Land, East Antarctica, occurs in a breccia zone composed of black material with glassy luster and fragments of host pyroxene gneiss which has undergone ultra-high temperature metamorphism as a constituent of the Archean Napier Complex. Under the optica...
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National Institute of Polar Research
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ftnipr:oai:nipr.repo.nii.ac.jp:00002824 2023-05-15T13:49:00+02:00 PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION モトヨシ ヨウイチ Yoichi MOTOYOSHI 1996-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2824 http://id.nii.ac.jp/1291/00002824/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2824&item_no=1&attribute_id=18&file_no=1 en eng National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2824 http://id.nii.ac.jp/1291/00002824/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 9, 65-75(1996-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2824&item_no=1&attribute_id=18&file_no=1 pseudotachylite McIntyre Island Enderby Land Antarctica WDS-compositional mapping Departmental Bulletin Paper P(論文) 1996 ftnipr 2022-11-26T19:42:17Z Pseudotachylite from McIntyre Island in Enderby Land, East Antarctica, occurs in a breccia zone composed of black material with glassy luster and fragments of host pyroxene gneiss which has undergone ultra-high temperature metamorphism as a constituent of the Archean Napier Complex. Under the optical and electron microscopes, the rock in the zone demonstrates a distinct sheared texture with extremely fine-grained materials, a part of which may be a glass. Abundant euhedral garnets occur in the fine-grained part, and their chemical compositions are quite heterogeneous from domain to domain. In view of the evidence that no garnet was observed in the host pyroxene gneiss, these garnets are likely to have crystallized very rapidly in the melt or solidified melt. Because of the chemical heterogeneity of garnet in the pseudotachylite even in a small domain, it is highly difficult to estimate the P-T conditions by means of geothermobarometric techniques using the mineral chemistries of microlites. Report Antarc* Antarctica East Antarctica Enderby Land McIntyre Island National Institute of Polar Research Repository, Japan East Antarctica McIntyre ENVELOPE(-153.000,-153.000,-87.283,-87.283) Napier ENVELOPE(-58.440,-58.440,-62.167,-62.167) Enderbyland ENVELOPE(53.000,53.000,-67.500,-67.500) McIntyre Island ENVELOPE(49.083,49.083,-67.367,-67.367) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
pseudotachylite McIntyre Island Enderby Land Antarctica WDS-compositional mapping |
spellingShingle |
pseudotachylite McIntyre Island Enderby Land Antarctica WDS-compositional mapping モトヨシ ヨウイチ Yoichi MOTOYOSHI PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION |
topic_facet |
pseudotachylite McIntyre Island Enderby Land Antarctica WDS-compositional mapping |
description |
Pseudotachylite from McIntyre Island in Enderby Land, East Antarctica, occurs in a breccia zone composed of black material with glassy luster and fragments of host pyroxene gneiss which has undergone ultra-high temperature metamorphism as a constituent of the Archean Napier Complex. Under the optical and electron microscopes, the rock in the zone demonstrates a distinct sheared texture with extremely fine-grained materials, a part of which may be a glass. Abundant euhedral garnets occur in the fine-grained part, and their chemical compositions are quite heterogeneous from domain to domain. In view of the evidence that no garnet was observed in the host pyroxene gneiss, these garnets are likely to have crystallized very rapidly in the melt or solidified melt. Because of the chemical heterogeneity of garnet in the pseudotachylite even in a small domain, it is highly difficult to estimate the P-T conditions by means of geothermobarometric techniques using the mineral chemistries of microlites. |
format |
Report |
author |
モトヨシ ヨウイチ Yoichi MOTOYOSHI |
author_facet |
モトヨシ ヨウイチ Yoichi MOTOYOSHI |
author_sort |
モトヨシ ヨウイチ |
title |
PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION |
title_short |
PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION |
title_full |
PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION |
title_fullStr |
PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION |
title_full_unstemmed |
PSEUDOTACHYLITE FROM McINTYRE ISLAND, ENDERBYLAND, EAST ANTARCTICA : EVIDENCE FOR A RAPID CRYSTALLIZATION |
title_sort |
pseudotachylite from mcintyre island, enderbyland, east antarctica : evidence for a rapid crystallization |
publisher |
National Institute of Polar Research |
publishDate |
1996 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2824 http://id.nii.ac.jp/1291/00002824/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2824&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(-153.000,-153.000,-87.283,-87.283) ENVELOPE(-58.440,-58.440,-62.167,-62.167) ENVELOPE(53.000,53.000,-67.500,-67.500) ENVELOPE(49.083,49.083,-67.367,-67.367) |
geographic |
East Antarctica McIntyre Napier Enderbyland McIntyre Island |
geographic_facet |
East Antarctica McIntyre Napier Enderbyland McIntyre Island |
genre |
Antarc* Antarctica East Antarctica Enderby Land McIntyre Island |
genre_facet |
Antarc* Antarctica East Antarctica Enderby Land McIntyre Island |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2824 http://id.nii.ac.jp/1291/00002824/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 9, 65-75(1996-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2824&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250317906706432 |