We emphasize practical aspects of pegmatite geology that might directly or indirectly help in exploration for lithium-cesium-tantalum (LCT) pegmatites, or for assessing regions for pegmatite-related mineral resource potential.
Petrogenesis of Mesozoic Li-, Cs-, and Ta-rich (LCT) pegmatites …
2023年2月1日 · The LCT pegmatites were formed at early Cretaceous, with decreasing ages from the barren pegmatite to the Li-rich pegmatite. The pegmatites have an inherited source from the back-arc sedimentary rocks of the Neoproterozoic Jiangnan Orogenic Belt;
tantalum LCT pegmatite melts are enriched in fluxing com-ponents including H 2 O, F, P, and B, which depress the solidus temperature, lower the density, and increase rates of ionic diffusion. This, in turn, enables pegmatites to form thin dikes and massive crystals despite having a felsic composition and
The genesis of LCT-type granitic pegmatites, as illustrated by lithium ...
2015年9月14日 · We propose that the distinct pegmatite subtypes (beryl columbite vs lepidolite–petalite subtypes) observed throughout the Monts d'Ambazac Pegmatite Field reflect the diverse contributions of crustal protoliths.
Mineral-deposit model for lithium-cesium-tantalum pegmatites
Lithium-cesium-tantalum (LCT) pegmatites comprise a compositionally defined subset of granitic pegmatites. The major minerals are quartz, potassium feldspar, albite, and muscovite; typical accessory minerals include biotite, garnet, tourmaline, and apatite.
(PDF) Geochemistry of LCT Pegmatites - ResearchGate
2019年1月1日 · Following these goals, the data from the pollucite-bearing Bikita pegmatite field are used for characterisation of the geochemical behaviour of Cs, and is compared to the Western Australian...
Tools and Workflows for Grassroots Li–Cs–Ta (LCT) Pegmatite
2019年8月20日 · This paper reviews the main controls of LCT pegmatite genesis relevant to mineral exploration programs and presents a workflow of grassroots exploration techniques, supported by examples from central Europe and Africa.
Geochemistry of LCT Pegmatites - SpringerLink
2019年2月14日 · The whole rock main and trace element geochemical data of the pegmatites is used to decipher the processes which led to the enormous Cs enrichment in the massive pollucite mineralisation. The geochemical study was also designed for potential prediction if a pegmatite...
Regional Zoning of a Li-Cs-Ta Pegmatite Field: Insights from …
2023年6月21日 · Li-Cs-Ta (LCT ) rare-element pegmatites occur as late-stage and highly fractionated bodies at the margins of regionally zoned granite pegmatite fields. The evolution of the granitic pegmatite system, including its rare-metal metallogeny, is often difficult to determine due to complex textures involving variable crystal size and a heterogeneous ...
In LCT pegmatite systems, fractional crystallisation is interpreted to cause eco-nomic enrichment of Cs, Li, Rb, Be, Nb, Ta and Sn. Certain elements are enriched within the crystal cumulus, when the mineral/melt distribution coefficients D are >1 (compatible elements) and thus their concentration is depleted within the remaining melt.