The model of charnockite formation process in Thala hills, East Antarctica
The research was performed in 2008-2009 within Belarus Government target program with the 54-th Russian Antarctic expedition. Geological mapping was carried out along with geochemical survey of Precambrian basement of Thala hills in western Enderby Land, Antarctica (lat 67°38,7'S ÷ 67°41'S...
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State Institution National Antarctic Scientific Center
2020
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Online Access: | https://doi.org/10.33275/1727-7485.13.2014.202 https://doaj.org/article/8b4fa13f405243ae8a2d4fd5860aada6 |
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ftdoajarticles:oai:doaj.org/article:8b4fa13f405243ae8a2d4fd5860aada6 2023-05-15T13:52:26+02:00 The model of charnockite formation process in Thala hills, East Antarctica О.В. Miasnikov 2020-04-01T00:00:00Z https://doi.org/10.33275/1727-7485.13.2014.202 https://doaj.org/article/8b4fa13f405243ae8a2d4fd5860aada6 EN UK eng ukr State Institution National Antarctic Scientific Center http://uaj.uac.gov.ua/index.php/uaj/article/view/202 https://doaj.org/toc/1727-7485 https://doaj.org/toc/2415-3087 1727-7485 2415-3087 doi:10.33275/1727-7485.13.2014.202 https://doaj.org/article/8b4fa13f405243ae8a2d4fd5860aada6 Український антарктичний журнал, Iss 13, Pp 15-21 (2020) geological mapping east antarctica petrogenesis petrophysics Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 article 2020 ftdoajarticles https://doi.org/10.33275/1727-7485.13.2014.202 2022-12-31T07:15:23Z The research was performed in 2008-2009 within Belarus Government target program with the 54-th Russian Antarctic expedition. Geological mapping was carried out along with geochemical survey of Precambrian basement of Thala hills in western Enderby Land, Antarctica (lat 67°38,7'S ÷ 67°41'S; long 46°02,7'E ÷ 46°14'E). Peculiarities of geophysical fields correspond to the different petrophysical conditions. In the outcrops within Thala hills, the field relations of plagiogneisses facies, migmatitic and plutonic rocks of charnockite and post-tectonic granitoid affinities are well exposed. Four types of main petrographic and petrophysical heterogeneities were singled out: 1) protolyth - relic two pyroxene amphibole, biotite plagiogneisses (pg); 2) intermediate hybrid amphibole-pyroxene-plagioclase-quartz-feldspathic charnockitic enderbites (čeg); 3) enclosing amphibole-feldspathic-quartz-plagioclase charnockites (čg); 4) in cores – ultrametamorphic feldspathic-quartz-plagioclase-amphibole-biotite streamy rapakivi-gneissic charnockites (hybrids) (čmg). The rocks correspond to the dominant processes of tectonic thermal activation of the four geochronological borders. The rocks architectonics reflects evolutionary succession of events, i.e. a change of direction of granitization processes from lateral (↔) crustal to vertical (↕) intrusive ones. The territory structure of Thala hills is represented as an ordered linear-dome model of Precambrian structural and compositional evolution: protolyth plagiogneiss ↔, intermediate charnockitic enderbite ↔, enclosing charnockite ↔, core - streamy rapakivioid charnockite. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Enderby Land Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Thala Hills ENVELOPE(46.000,46.000,-67.667,-67.667) Ukrainian Antarctic Journal 13 15 21 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Ukrainian |
topic |
geological mapping east antarctica petrogenesis petrophysics Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
geological mapping east antarctica petrogenesis petrophysics Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 О.В. Miasnikov The model of charnockite formation process in Thala hills, East Antarctica |
topic_facet |
geological mapping east antarctica petrogenesis petrophysics Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
description |
The research was performed in 2008-2009 within Belarus Government target program with the 54-th Russian Antarctic expedition. Geological mapping was carried out along with geochemical survey of Precambrian basement of Thala hills in western Enderby Land, Antarctica (lat 67°38,7'S ÷ 67°41'S; long 46°02,7'E ÷ 46°14'E). Peculiarities of geophysical fields correspond to the different petrophysical conditions. In the outcrops within Thala hills, the field relations of plagiogneisses facies, migmatitic and plutonic rocks of charnockite and post-tectonic granitoid affinities are well exposed. Four types of main petrographic and petrophysical heterogeneities were singled out: 1) protolyth - relic two pyroxene amphibole, biotite plagiogneisses (pg); 2) intermediate hybrid amphibole-pyroxene-plagioclase-quartz-feldspathic charnockitic enderbites (čeg); 3) enclosing amphibole-feldspathic-quartz-plagioclase charnockites (čg); 4) in cores – ultrametamorphic feldspathic-quartz-plagioclase-amphibole-biotite streamy rapakivi-gneissic charnockites (hybrids) (čmg). The rocks correspond to the dominant processes of tectonic thermal activation of the four geochronological borders. The rocks architectonics reflects evolutionary succession of events, i.e. a change of direction of granitization processes from lateral (↔) crustal to vertical (↕) intrusive ones. The territory structure of Thala hills is represented as an ordered linear-dome model of Precambrian structural and compositional evolution: protolyth plagiogneiss ↔, intermediate charnockitic enderbite ↔, enclosing charnockite ↔, core - streamy rapakivioid charnockite. |
format |
Article in Journal/Newspaper |
author |
О.В. Miasnikov |
author_facet |
О.В. Miasnikov |
author_sort |
О.В. Miasnikov |
title |
The model of charnockite formation process in Thala hills, East Antarctica |
title_short |
The model of charnockite formation process in Thala hills, East Antarctica |
title_full |
The model of charnockite formation process in Thala hills, East Antarctica |
title_fullStr |
The model of charnockite formation process in Thala hills, East Antarctica |
title_full_unstemmed |
The model of charnockite formation process in Thala hills, East Antarctica |
title_sort |
model of charnockite formation process in thala hills, east antarctica |
publisher |
State Institution National Antarctic Scientific Center |
publishDate |
2020 |
url |
https://doi.org/10.33275/1727-7485.13.2014.202 https://doaj.org/article/8b4fa13f405243ae8a2d4fd5860aada6 |
long_lat |
ENVELOPE(46.000,46.000,-67.667,-67.667) |
geographic |
Antarctic East Antarctica Thala Hills |
geographic_facet |
Antarctic East Antarctica Thala Hills |
genre |
Antarc* Antarctic Antarctica East Antarctica Enderby Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Enderby Land |
op_source |
Український антарктичний журнал, Iss 13, Pp 15-21 (2020) |
op_relation |
http://uaj.uac.gov.ua/index.php/uaj/article/view/202 https://doaj.org/toc/1727-7485 https://doaj.org/toc/2415-3087 1727-7485 2415-3087 doi:10.33275/1727-7485.13.2014.202 https://doaj.org/article/8b4fa13f405243ae8a2d4fd5860aada6 |
op_doi |
https://doi.org/10.33275/1727-7485.13.2014.202 |
container_title |
Ukrainian Antarctic Journal |
container_issue |
13 |
container_start_page |
15 |
op_container_end_page |
21 |
_version_ |
1766256712784805888 |