... reported occurrence of a lithian tourmaline and lepidolite in the geologic record, as well as one of the two earliest known examples of the lithium–cesium–tantalum (LCT) family of pegmatites. The Sinceni magma is most plausibly derived from a metasedimentary source by intrusion of hot mantle melts...

...Milan Novák; Radek Škoda; Petr Gadas; Lukáš Krmíček; Petr Černý Abstract Two granitic pegmatites with mixed (NYF + LCT) signatures from the Moldanubian Zone, Czech Republic, were examined to determine their origin. On the basis of geological setting, paragenesis, geochemical modeling and chemical...

... pegmatites can represent superb deposits of rare metals, including some ‘critical metals' that are important for many modern technologies ( Linnen et al . 2012 , London 2018 ). Notably, the majority of ore deposits associated with granitic pegmatites are found in LCT pegmatites, which represent many...

...Wenjing Li; Bin Chen; Xiaodong Chen; Yang Sun; Shuaijie Liu The magmatic-hydrothermal transition in LCT-type pegmatites, which are enriched in lithium (Li), cesium (Cs), and tantalum (Ta), has received international attention because rare metal (e.g., Li) minerals reach saturation at this stage...

...Teresa Llorens; Maria Candelas Moro Abstract The La Canalita pegmatites in the Navasfrías Sn–W district, in Spain, are a group of Li-rich LCT rare-element pegmatites hosted by metamorphic rocks. It consists of several dikes up to 1 m thick, 16 m in length and of unknown depth that were mined...

...Dwight C. Bradley Why are lithium-cesium-tantalum (LCT) pegmatites relatively common in some Phanerozoic orogenic belts but rare or absent in others? For example, the 3500-km-long Appalachian orogen, from Alabama and Newfoundland, has seventeen LCT districts, whereas the 8000-km-long...

... ( Shcherbak et al. 2008 ; Stepanyuk et al. 2018 , 2021 ). According to the classification of Černý and Ercit ( 2005 ), the studied pegmatite dikes show affinity to the rare-element class, specifically to the petalite or spodumene subtype of the LCT (Li-Cs-Ta) family. General mineralogical features of the Li...

...Kai Qu; Pei Ni; Guang Fan; Guowu Li; Yanjuan Wang ABSTRACT Stibiotantalite, SbTaO 4 , from the Nanyangshan LCT pegmatite, North Qinling Orogen, Central China is described. The mineral is associated with oxystibiomicrolite, oxycalcioroméite, hydrokenomicrolite, hydroxynatromicrolite , hydromicrolite...

...M. Beth McClenaghan; Denise M. Brushett; Roger C. Paulen; Christopher E. Beckett-Brown; Jessey M. Rice The Brazil Lake lithium-caesium-tantalum (LCT)-type pegmatites (North, South and Army Road pegmatites) in eastern Canada, were the focus of a detailed till study to document glacial dispersal...

...Fig. 4. Summary of age controls for LCT pegmatites in the Appalachians. Data for Brazil Lake are from Kontak et al . (2005) and for Topsham are from Tomascak et al . (1996) . ...

...Sarah L. Hanson Abstract Pegmatites containing rare elements can be grouped into families based on geochemical composition. The family classification includes pegmatites that are enriched in lithium, cesium, and tantalum (LCT pegmatites) and those that are enriched in niobium, yttrium + rare-earth...

... by a mixed H 2 O + CO 2 fluid. The bulk of the pegmatite bodies encountered are not obviously of anatectic origin, but are derived by fractionation of pluton-size batches of felsic magma. We consider LCT (Li–Cs–Ta-enriched) pegmatites to be members of orogenic (calc-alkaline suites) formed in a subduction...

...Tomáš Magna; Milan Novák; Jan Cempírek; Vojtěch Janoušek; Clemens V. Ullmann; Uwe Wiechert Abstract The age distribution of lithium-cesium-tantalum (LCT) pegmatites largely overlaps with major phases of collisional orogenic events and assembly of supercontinents. Some of the largest known LCT...