Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica
Fe-Ti oxide minerals can be locally aggregated or enriched in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica. The enrichment is related to anatexis and subsequent high-grade metamorphism, not inherited from the protolith. The partial melting process was responsible for the...
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2021
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ftdoajarticles:oai:doaj.org/article:53f31e474d85496bb2884e469e0aad84 2023-05-15T13:56:54+02:00 Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica REN Liudong 2021-10-01T00:00:00Z https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.060 https://doaj.org/article/53f31e474d85496bb2884e469e0aad84 ZH chi Institute of Geomechanics, Chinese Academy of Geological Sciences https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.05.060 https://doaj.org/toc/1006-6616 1006-6616 doi:10.12090/j.issn.1006-6616.2021.27.05.060 https://doaj.org/article/53f31e474d85496bb2884e469e0aad84 Dizhi lixue xuebao, Vol 27, Iss 5, Pp 736-746 (2021) fe-ti oxides anatexis component differentiation pan-african event larsemann hills Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.060 2023-02-26T01:33:39Z Fe-Ti oxide minerals can be locally aggregated or enriched in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica. The enrichment is related to anatexis and subsequent high-grade metamorphism, not inherited from the protolith. The partial melting process was responsible for the residues or local enrichment of the inert Fe-Ti-Al elements and the migration of mobile components, and the volatiles were preferentially incorporated in the melt. In the water-deficient system, the local "melt" in anatexis crystallized to form the leucosomes without melt texture or minimum eutectic composition, suggesting the meta-melt feature, not real melt. The coarse leucosome or pegmatite occurred in anataxis as pre-granitic vein or body and had nothing to do with the late stage differentiation of the granitic magma. Together with the presence of the meta-melt, the substantial differentiation of the components resulted in solid residues and corresponding meta-melt phases, with the former enriched in Al, Fe elements and sillimanite, Fe-Ti oxide minerals occurred. On the contrary, the leucosomes with possible short distance migration of components were poor in Fe, Ti compositions, and seldom formed garnet and Fe-Ti oxides. The volatile-unsaturated anatexis was an essentially closed system and the total dehydration effect was not obvious. The presence of some typical minerals in high-grade metamorphism of the quartzofeldspathic gneisses, such as sillimanite, garnet, cordierite and spinel, was derived from component differentiation in partial melting of the rocks. However, the components migration was limited, and the evolving stages of metamorphism and differentiation could be preserved. Voluminous Fe-Ti oxides and sillimanite in the quartzofeldspathic gneisses suggest the possible local or differential uplifting of the area, the heterogeneity of deformation and accompanying components differentiation, corresponding to the reactivation of the earlier structures in the Pan-African event. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Directory of Open Access Journals: DOAJ Articles East Antarctica Larsemann Hills ENVELOPE(76.217,76.217,-69.400,-69.400) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Chinese |
topic |
fe-ti oxides anatexis component differentiation pan-african event larsemann hills Geology QE1-996.5 |
spellingShingle |
fe-ti oxides anatexis component differentiation pan-african event larsemann hills Geology QE1-996.5 REN Liudong Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica |
topic_facet |
fe-ti oxides anatexis component differentiation pan-african event larsemann hills Geology QE1-996.5 |
description |
Fe-Ti oxide minerals can be locally aggregated or enriched in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica. The enrichment is related to anatexis and subsequent high-grade metamorphism, not inherited from the protolith. The partial melting process was responsible for the residues or local enrichment of the inert Fe-Ti-Al elements and the migration of mobile components, and the volatiles were preferentially incorporated in the melt. In the water-deficient system, the local "melt" in anatexis crystallized to form the leucosomes without melt texture or minimum eutectic composition, suggesting the meta-melt feature, not real melt. The coarse leucosome or pegmatite occurred in anataxis as pre-granitic vein or body and had nothing to do with the late stage differentiation of the granitic magma. Together with the presence of the meta-melt, the substantial differentiation of the components resulted in solid residues and corresponding meta-melt phases, with the former enriched in Al, Fe elements and sillimanite, Fe-Ti oxide minerals occurred. On the contrary, the leucosomes with possible short distance migration of components were poor in Fe, Ti compositions, and seldom formed garnet and Fe-Ti oxides. The volatile-unsaturated anatexis was an essentially closed system and the total dehydration effect was not obvious. The presence of some typical minerals in high-grade metamorphism of the quartzofeldspathic gneisses, such as sillimanite, garnet, cordierite and spinel, was derived from component differentiation in partial melting of the rocks. However, the components migration was limited, and the evolving stages of metamorphism and differentiation could be preserved. Voluminous Fe-Ti oxides and sillimanite in the quartzofeldspathic gneisses suggest the possible local or differential uplifting of the area, the heterogeneity of deformation and accompanying components differentiation, corresponding to the reactivation of the earlier structures in the Pan-African event. |
format |
Article in Journal/Newspaper |
author |
REN Liudong |
author_facet |
REN Liudong |
author_sort |
REN Liudong |
title |
Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica |
title_short |
Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica |
title_full |
Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica |
title_fullStr |
Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica |
title_full_unstemmed |
Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica |
title_sort |
anatexis and enrichment mechanism of the fe-ti oxide minerals in the quartzofeldspathic gneisses from the larsemann hills, east antarctica |
publisher |
Institute of Geomechanics, Chinese Academy of Geological Sciences |
publishDate |
2021 |
url |
https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.060 https://doaj.org/article/53f31e474d85496bb2884e469e0aad84 |
long_lat |
ENVELOPE(76.217,76.217,-69.400,-69.400) |
geographic |
East Antarctica Larsemann Hills |
geographic_facet |
East Antarctica Larsemann Hills |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Dizhi lixue xuebao, Vol 27, Iss 5, Pp 736-746 (2021) |
op_relation |
https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.05.060 https://doaj.org/toc/1006-6616 1006-6616 doi:10.12090/j.issn.1006-6616.2021.27.05.060 https://doaj.org/article/53f31e474d85496bb2884e469e0aad84 |
op_doi |
https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.060 |
_version_ |
1766264508812099584 |