English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Journal Article

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

Authors

Shumlyanskyy,  Leonid
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Franz,  Gerhard
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

/persons/resource/sglynn

Glynn,  Sarah
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Mytrokhyn,  Oleksandr
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Voznyak,  Dmytro
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Bilan,  Olena
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

External Ressource
No external resources are shared
Fulltext (public)

5008642.pdf
(Publisher version), 6MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Shumlyanskyy, L., Franz, G., Glynn, S., Mytrokhyn, O., Voznyak, D., Bilan, O. (2021): Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites. - European Journal of Mineralogy, 33, 6, 703-716.
https://doi.org/10.5194/ejm-33-703-2021


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008642
Abstract
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. 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 ±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.