Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia
The Lovozero peralkaline massif (Kola Peninsula, Russia) is widely known for its unique mineral diversity, and most of the rare metal minerals are found in pegmatites, which are spatially associated with poikilitic rocks (approximately 5% of the massif volume). In order to determine the reasons for...
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ftdoajarticles:oai:doaj.org/article:d217718ca63443968444fc2c04791d98 2023-05-15T17:04:55+02:00 Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia Julia A. Mikhailova Yakov A. Pakhomovsky Olga F. Goychuk Andrey O. Kalashnikov Ayya V. Bazai Victor N. Yakovenchuk 2021-09-01T00:00:00Z https://doi.org/10.3390/min11090974 https://doaj.org/article/d217718ca63443968444fc2c04791d98 EN eng MDPI AG https://www.mdpi.com/2075-163X/11/9/974 https://doaj.org/toc/2075-163X doi:10.3390/min11090974 2075-163X https://doaj.org/article/d217718ca63443968444fc2c04791d98 Minerals, Vol 11, Iss 974, p 974 (2021) Lovozero massif peralkaline rocks pegmatites autometasomatic alteration Mineralogy QE351-399.2 article 2021 ftdoajarticles https://doi.org/10.3390/min11090974 2022-12-31T05:32:38Z The Lovozero peralkaline massif (Kola Peninsula, Russia) is widely known for its unique mineral diversity, and most of the rare metal minerals are found in pegmatites, which are spatially associated with poikilitic rocks (approximately 5% of the massif volume). In order to determine the reasons for this relationship, we have investigated petrography and the chemical composition of poikilitic rocks as well as the chemical composition of the rock-forming and accessory minerals in these rocks. The differentiation of magmatic melt during the formation of the rocks of the Lovozero massif followed the path: lujavrite → foyaite → urtite (magmatic stage) → pegmatite (hydrothermal stage). Yet, for peralkaline systems, the transition between magmatic melt and hydrothermal solution is gradual. In the case of the initially high content of volatiles in the melt, the differentiation path was probably as follows: lujavrite → foyaite (magmatic stage) → urtitization of foyaite → pegmatite (hydrothermal stage). Poikilitic rocks were formed at the stage of urtitization, and we called them pre-pegmatites. Indeed, the poikilitic rocks have a metasomatic texture and, in terms of chemical composition, correspond to magmatic urtite. The reason for the abundance of rare metal minerals in pegmatites associated with poikilitic rocks is that almost only one nepheline is deposited during urtitization, whereas during the magmatic crystallization of urtite, rare elements form accessory minerals in the rock and are less concentrated in the residual solution. Article in Journal/Newspaper kola peninsula Directory of Open Access Journals: DOAJ Articles Kola Peninsula Lovozero ENVELOPE(35.016,35.016,68.006,68.006) Minerals 11 9 974 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Lovozero massif peralkaline rocks pegmatites autometasomatic alteration Mineralogy QE351-399.2 |
spellingShingle |
Lovozero massif peralkaline rocks pegmatites autometasomatic alteration Mineralogy QE351-399.2 Julia A. Mikhailova Yakov A. Pakhomovsky Olga F. Goychuk Andrey O. Kalashnikov Ayya V. Bazai Victor N. Yakovenchuk Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia |
topic_facet |
Lovozero massif peralkaline rocks pegmatites autometasomatic alteration Mineralogy QE351-399.2 |
description |
The Lovozero peralkaline massif (Kola Peninsula, Russia) is widely known for its unique mineral diversity, and most of the rare metal minerals are found in pegmatites, which are spatially associated with poikilitic rocks (approximately 5% of the massif volume). In order to determine the reasons for this relationship, we have investigated petrography and the chemical composition of poikilitic rocks as well as the chemical composition of the rock-forming and accessory minerals in these rocks. The differentiation of magmatic melt during the formation of the rocks of the Lovozero massif followed the path: lujavrite → foyaite → urtite (magmatic stage) → pegmatite (hydrothermal stage). Yet, for peralkaline systems, the transition between magmatic melt and hydrothermal solution is gradual. In the case of the initially high content of volatiles in the melt, the differentiation path was probably as follows: lujavrite → foyaite (magmatic stage) → urtitization of foyaite → pegmatite (hydrothermal stage). Poikilitic rocks were formed at the stage of urtitization, and we called them pre-pegmatites. Indeed, the poikilitic rocks have a metasomatic texture and, in terms of chemical composition, correspond to magmatic urtite. The reason for the abundance of rare metal minerals in pegmatites associated with poikilitic rocks is that almost only one nepheline is deposited during urtitization, whereas during the magmatic crystallization of urtite, rare elements form accessory minerals in the rock and are less concentrated in the residual solution. |
format |
Article in Journal/Newspaper |
author |
Julia A. Mikhailova Yakov A. Pakhomovsky Olga F. Goychuk Andrey O. Kalashnikov Ayya V. Bazai Victor N. Yakovenchuk |
author_facet |
Julia A. Mikhailova Yakov A. Pakhomovsky Olga F. Goychuk Andrey O. Kalashnikov Ayya V. Bazai Victor N. Yakovenchuk |
author_sort |
Julia A. Mikhailova |
title |
Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia |
title_short |
Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia |
title_full |
Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia |
title_fullStr |
Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia |
title_full_unstemmed |
Pre-Pegmatite Stage in Peralkaline Magmatic Process: Insights from Poikilitic Syenites from the Lovozero Massif, Kola Peninsula, Russia |
title_sort |
pre-pegmatite stage in peralkaline magmatic process: insights from poikilitic syenites from the lovozero massif, kola peninsula, russia |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/min11090974 https://doaj.org/article/d217718ca63443968444fc2c04791d98 |
long_lat |
ENVELOPE(35.016,35.016,68.006,68.006) |
geographic |
Kola Peninsula Lovozero |
geographic_facet |
Kola Peninsula Lovozero |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_source |
Minerals, Vol 11, Iss 974, p 974 (2021) |
op_relation |
https://www.mdpi.com/2075-163X/11/9/974 https://doaj.org/toc/2075-163X doi:10.3390/min11090974 2075-163X https://doaj.org/article/d217718ca63443968444fc2c04791d98 |
op_doi |
https://doi.org/10.3390/min11090974 |
container_title |
Minerals |
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11 |
container_issue |
9 |
container_start_page |
974 |
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1766059273860677632 |