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Fluoritites Produced by Crystallization of Carbonate–Fluoride Magma.
- Source :
-
Journal of Petrology . Apr2024, Vol. 65 Issue 4, p1-8. 8p. - Publication Year :
- 2024
-
Abstract
- Fluorite-dominated rocks are occasionally found in association with carbonatites, but their geologic and petrologic relations are rarely reported. The Dunkeldyk area of the Pamir mountains in south-eastern Tajikistan contains dikes of distinctive rocks composed of calcite, fluorite, celestine-barite, sulfides, apatite, with minor quartz, biotite, and REE fluorcarbonates. The dikes have sharp contacts with the host (meta-)sedimentary rocks and layering with ribbons, ranging from fluorite-bearing calcite carbonatites to fluoritites (rocks with >50% fluorite). The fluoritites are characterized by high Ca, F, Ba, Sr, REE, and S coupled with anomalously low O. The geologic relations and textures suggest a magmatic origin of the dikes from melts close to calcite–fluorite eutectic that experienced nucleation-controlled differentiation during the crystallization of dikes and the formation of fluoritite cumulates in larger intrusions. The Dunkeldyk dikes demonstrate that sizable geological bodies of fluorite-dominated rocks could form from carbonate–fluoride melts originating from the differentiation of alkaline silicate magmas. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00223530
- Volume :
- 65
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Petrology
- Publication Type :
- Academic Journal
- Accession number :
- 176862555
- Full Text :
- https://doi.org/10.1093/petrology/egae033