Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites
In order to determine the U-Pb crystallization age of zircon from the tourmaline-muscovite granites of the Kolmozero–Voronya greenstone belt located in the northeastern Fennoscandian Shield (Kola Peninsula), an isotope-geochronological study of the zircon grains was performed using a SHRIMP-RG micro...
Published in: | Minerals |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
MDPI AG
2020
|
Subjects: | |
Online Access: | https://doi.org/10.3390/min10090760 https://doaj.org/article/5749933f98e843a59ee15e5c29a42db3 |
id |
ftdoajarticles:oai:doaj.org/article:5749933f98e843a59ee15e5c29a42db3 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:5749933f98e843a59ee15e5c29a42db3 2023-05-15T16:13:11+02:00 Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites Nikolay M. Kudryashov Oksana V. Udoratina Matthew A. Coble Ekaterina N. Steshenko 2020-08-01T00:00:00Z https://doi.org/10.3390/min10090760 https://doaj.org/article/5749933f98e843a59ee15e5c29a42db3 EN eng MDPI AG https://www.mdpi.com/2075-163X/10/9/760 https://doaj.org/toc/2075-163X doi:10.3390/min10090760 2075-163X https://doaj.org/article/5749933f98e843a59ee15e5c29a42db3 Minerals, Vol 10, Iss 760, p 760 (2020) Archaean tourmaline-muscovite granite U-Pb (SHRIMP) zircon Kolmozero spodumene pegmatite deposit Kola Peninsula Mineralogy QE351-399.2 article 2020 ftdoajarticles https://doi.org/10.3390/min10090760 2022-12-31T14:21:55Z In order to determine the U-Pb crystallization age of zircon from the tourmaline-muscovite granites of the Kolmozero–Voronya greenstone belt located in the northeastern Fennoscandian Shield (Kola Peninsula), an isotope-geochronological study of the zircon grains was performed using a SHRIMP-RG microprobe. The belt is represented by the Archaean volcano-sedimentary rocks (2.9–2.8 Ga). Deposits of rare-metal pegmatites (Li and Cs with associated Nb, Ta, and Be) occur within the belt and on its margins. The age of the pegmatites within the belt was estimated at 2.7–2.6 Ga. Until now, there has been no generally accepted view on the genetic relation of the pegmatites with granite. Various authors have suggested that the pegmatites could potentially be associated with many type of granitoids within the region, i.e., plagiogranites, tonalites, amphibole-biotite granodiorites, microcline granites, alkaline granites, or muscovite-tourmaline granites. Zircon crystals from the muscovite-tourmaline granites are heterogeneous; they have less altered cores and strongly altered rims. The zircon cores are slightly enriched in U at a value of 173–1030 ppm, Th/U = 0.1–0.4. The zircons’ rims are heavily enriched in U at a value of 700–3300 ppm, Th/U = 0.03–0.08, indicating metasomatic processes. Zircon characteristics show that it crystallized from a melt enriched in a fluid phase. Fluid activity lasted after zircon crystallization as reflected in the irregular composition of the mineral and its rare earth element (REE) patterns that are typical of a metasomatic zircon. The computed zircon crystallization temperature in the tourmaline-muscovite granites is in the range of 650–850 °C. The discordant age calculated for five analyzed points of the zircon crystal cores is 2802 ± 13 Ma. The discordant age for four analyzed points of the zircon crystal rims is found to be 2728 ± 14 Ma. On the basis of the obtained isotope-geochronological data, we conclude that the tourmaline-muscovite granites located in the immediate vicinity of ... Article in Journal/Newspaper Fennoscandian kola peninsula Directory of Open Access Journals: DOAJ Articles Kola Peninsula Minerals 10 9 760 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Archaean tourmaline-muscovite granite U-Pb (SHRIMP) zircon Kolmozero spodumene pegmatite deposit Kola Peninsula Mineralogy QE351-399.2 |
spellingShingle |
Archaean tourmaline-muscovite granite U-Pb (SHRIMP) zircon Kolmozero spodumene pegmatite deposit Kola Peninsula Mineralogy QE351-399.2 Nikolay M. Kudryashov Oksana V. Udoratina Matthew A. Coble Ekaterina N. Steshenko Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites |
topic_facet |
Archaean tourmaline-muscovite granite U-Pb (SHRIMP) zircon Kolmozero spodumene pegmatite deposit Kola Peninsula Mineralogy QE351-399.2 |
description |
In order to determine the U-Pb crystallization age of zircon from the tourmaline-muscovite granites of the Kolmozero–Voronya greenstone belt located in the northeastern Fennoscandian Shield (Kola Peninsula), an isotope-geochronological study of the zircon grains was performed using a SHRIMP-RG microprobe. The belt is represented by the Archaean volcano-sedimentary rocks (2.9–2.8 Ga). Deposits of rare-metal pegmatites (Li and Cs with associated Nb, Ta, and Be) occur within the belt and on its margins. The age of the pegmatites within the belt was estimated at 2.7–2.6 Ga. Until now, there has been no generally accepted view on the genetic relation of the pegmatites with granite. Various authors have suggested that the pegmatites could potentially be associated with many type of granitoids within the region, i.e., plagiogranites, tonalites, amphibole-biotite granodiorites, microcline granites, alkaline granites, or muscovite-tourmaline granites. Zircon crystals from the muscovite-tourmaline granites are heterogeneous; they have less altered cores and strongly altered rims. The zircon cores are slightly enriched in U at a value of 173–1030 ppm, Th/U = 0.1–0.4. The zircons’ rims are heavily enriched in U at a value of 700–3300 ppm, Th/U = 0.03–0.08, indicating metasomatic processes. Zircon characteristics show that it crystallized from a melt enriched in a fluid phase. Fluid activity lasted after zircon crystallization as reflected in the irregular composition of the mineral and its rare earth element (REE) patterns that are typical of a metasomatic zircon. The computed zircon crystallization temperature in the tourmaline-muscovite granites is in the range of 650–850 °C. The discordant age calculated for five analyzed points of the zircon crystal cores is 2802 ± 13 Ma. The discordant age for four analyzed points of the zircon crystal rims is found to be 2728 ± 14 Ma. On the basis of the obtained isotope-geochronological data, we conclude that the tourmaline-muscovite granites located in the immediate vicinity of ... |
format |
Article in Journal/Newspaper |
author |
Nikolay M. Kudryashov Oksana V. Udoratina Matthew A. Coble Ekaterina N. Steshenko |
author_facet |
Nikolay M. Kudryashov Oksana V. Udoratina Matthew A. Coble Ekaterina N. Steshenko |
author_sort |
Nikolay M. Kudryashov |
title |
Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites |
title_short |
Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites |
title_full |
Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites |
title_fullStr |
Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites |
title_full_unstemmed |
Geochronological and Geochemical Study of Zircon from Tourmaline-Muscovite Granites of the Archaean Kolmozero–Voronya Greenstone Belt: Insights into Sources of the Rare-Metal Pegmatites |
title_sort |
geochronological and geochemical study of zircon from tourmaline-muscovite granites of the archaean kolmozero–voronya greenstone belt: insights into sources of the rare-metal pegmatites |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/min10090760 https://doaj.org/article/5749933f98e843a59ee15e5c29a42db3 |
geographic |
Kola Peninsula |
geographic_facet |
Kola Peninsula |
genre |
Fennoscandian kola peninsula |
genre_facet |
Fennoscandian kola peninsula |
op_source |
Minerals, Vol 10, Iss 760, p 760 (2020) |
op_relation |
https://www.mdpi.com/2075-163X/10/9/760 https://doaj.org/toc/2075-163X doi:10.3390/min10090760 2075-163X https://doaj.org/article/5749933f98e843a59ee15e5c29a42db3 |
op_doi |
https://doi.org/10.3390/min10090760 |
container_title |
Minerals |
container_volume |
10 |
container_issue |
9 |
container_start_page |
760 |
_version_ |
1765998788391993344 |