Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites

<p>The origin of large miarolitic (also known as “chamber”) pegmatites is not fully understood although they may have great economic value. The formation of cavities in magmatic bodies is related to melt degassing and gas or fluid flow through partially solidified magma. In this paper, the or...

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Autores principales:	L. Shumlyanskyy, G. Franz, S. Glynn, O. Mytrokhyn, D. Voznyak, O. Bilan
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/5145c0d892c84cbc98546b7f4a169d68
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spelling	oai:doaj.org-article:5145c0d892c84cbc98546b7f4a169d682021-11-11T08:38:54ZGeochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites10.5194/ejm-33-703-20210935-12211617-4011https://doaj.org/article/5145c0d892c84cbc98546b7f4a169d682021-11-01T00:00:00Zhttps://ejm.copernicus.org/articles/33/703/2021/ejm-33-703-2021.pdfhttps://doaj.org/toc/0935-1221https://doaj.org/toc/1617-4011<p>The origin of large miarolitic (also known as “chamber”) pegmatites is not fully understood although they may have great economic value. The formation of cavities in magmatic bodies is related to melt degassing and gas or fluid flow through partially solidified magma. In this paper, the origin of the Volyn pegmatite field, located in the Palaeoproterozoic Korosten anorthosite–mangerite–charnockite–granite (AMCG) complex, North-Western region of the Ukrainian Shield, is discussed. Pegmatites of the field host deposits of piezoelectric quartz that is accompanied by gem-quality beryl and topaz. The Volyn pegmatite field is confined to granites located in the south-western part of the Korosten complex and extends for 22 km along the contact with the anorthosite massif within the Korosten plutonic complex. Geological data indicate hybridization of basic melts and partly crystallized granites, as well as direct impact of fluids derived from basic melts on the chamber pegmatites.</p> <p>The new U–Pb zircon ages obtained for granites and pegmatites of the Korosten complex confirm that the rock assemblage in the northern part of the complex crystallized between 1800 and 1780 Ma, whereas rocks in the southern part intruded mainly between 1768 and 1755 Ma. U–Pb zircon ages for granites from the south-western part of the Korosten complex indicate that granites were emplaced at 1770–1765 Ma, a few million years prior to the intrusion of the gabbro–anorthosite massif (1762–1758 Ma), while chamber pegmatites in these granites crystallized at 1760 <span class="inline-formula">±</span> 3 Ma, coevally with the basic rocks. Ultimately, the formation of the chamber pegmatites was related to the reheating of the semi-crystallized granitic intrusion and to fluids migrating from the underlying gabbro–anorthosite massif.</p>L. ShumlyanskyyG. FranzS. GlynnS. GlynnO. MytrokhynD. VoznyakO. BilanCopernicus PublicationsarticleMineralogyQE351-399.2ENEuropean Journal of Mineralogy, Vol 33, Pp 703-716 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mineralogy QE351-399.2
spellingShingle	Mineralogy QE351-399.2 L. Shumlyanskyy G. Franz S. Glynn S. Glynn O. Mytrokhyn D. Voznyak O. Bilan Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites
description	<p>The origin of large miarolitic (also known as “chamber”) pegmatites is not fully understood although they may have great economic value. The formation of cavities in magmatic bodies is related to melt degassing and gas or fluid flow through partially solidified magma. In this paper, the origin of the Volyn pegmatite field, located in the Palaeoproterozoic Korosten anorthosite–mangerite–charnockite–granite (AMCG) complex, North-Western region of the Ukrainian Shield, is discussed. Pegmatites of the field host deposits of piezoelectric quartz that is accompanied by gem-quality beryl and topaz. The Volyn pegmatite field is confined to granites located in the south-western part of the Korosten complex and extends for 22 km along the contact with the anorthosite massif within the Korosten plutonic complex. Geological data indicate hybridization of basic melts and partly crystallized granites, as well as direct impact of fluids derived from basic melts on the chamber pegmatites.</p> <p>The new U–Pb zircon ages obtained for granites and pegmatites of the Korosten complex confirm that the rock assemblage in the northern part of the complex crystallized between 1800 and 1780 Ma, whereas rocks in the southern part intruded mainly between 1768 and 1755 Ma. U–Pb zircon ages for granites from the south-western part of the Korosten complex indicate that granites were emplaced at 1770–1765 Ma, a few million years prior to the intrusion of the gabbro–anorthosite massif (1762–1758 Ma), while chamber pegmatites in these granites crystallized at 1760 <span class="inline-formula">±</span> 3 Ma, coevally with the basic rocks. Ultimately, the formation of the chamber pegmatites was related to the reheating of the semi-crystallized granitic intrusion and to fluids migrating from the underlying gabbro–anorthosite massif.</p>
format	article
author	L. Shumlyanskyy G. Franz S. Glynn S. Glynn O. Mytrokhyn D. Voznyak O. Bilan
author_facet	L. Shumlyanskyy G. Franz S. Glynn S. Glynn O. Mytrokhyn D. Voznyak O. Bilan
author_sort	L. Shumlyanskyy
title	Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites
title_short	Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites
title_full	Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites
title_fullStr	Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites
title_full_unstemmed	Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites
title_sort	geochronology of granites of the western korosten amcg complex (ukrainian shield): implications for the emplacement history and origin of miarolitic pegmatites
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/5145c0d892c84cbc98546b7f4a169d68
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Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites

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