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LCT pegmatites

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Journal Article
Published: 01 March 2018
European Journal of Mineralogy (2018) 30 (2): 205–218.
... 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...
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Journal Article
Published: 01 August 2012
The Canadian Mineralogist (2012) 50 (4): 1077–1094.
...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...
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Journal Article
Published: 30 September 2019
The Canadian Mineralogist (2019) 57 (5): 753–755.
... 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...
Journal Article
Journal: GSA Bulletin
Published: 19 February 2025
GSA Bulletin (2025)
...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...
Journal Article
Published: 01 April 2010
The Canadian Mineralogist (2010) 48 (2): 375–390.
...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...
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Journal Article
Published: 30 September 2019
The Canadian Mineralogist (2019) 57 (5): 715–717.
...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...
FIGURES
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(A) Distribution of lithium-cesium-tantalum (LCT) pegmatites, S-type granitoids, and Habahe Group metasedimentary rocks (HGMRs) in Chinese Altai orogenic belt (modified after Jahn et al., 2000; Jiang et al., 2016). Ages (in Ma) of rocks are depicted as numbers linked to sample location by thin black lines. (B) Plot of zircon εHf(t) vs. crystallization age. Solid lines represent depleted mantle (DM) and chondritic uniform reservoir (CHUR) evolution curves, respectively. Dashed lines correspond to Hf isotope evolution of protoliths extracted from mantle at either 1.2 Ga or 0.9 Ga with 176Lu/177Hf = 0.015 (average value for continental crust). Green areas represent three periods of crustal anatexis: 391–377 Ma, 299–271 Ma, and 233–197 Ma (Jiang et al., 2010; Liu, 2016; Liu et al., 2020). Abbreviations: O—Ordovician; S—Silurian; D—Devonian; C—Carboniferous; J—Jurassic. Data from this study and previous literature are listed in Supplemental Material (see text footnote 1).
Published: 03 December 2024
Figure 1. (A) Distribution of lithium-cesium-tantalum (LCT) pegmatites, S-type granitoids, and Habahe Group metasedimentary rocks (HGMRs) in Chinese Altai orogenic belt (modified after Jahn et al., 2000 ; Jiang et al., 2016 ). Ages (in Ma) of rocks are depicted as numbers linked to sample
Image
Field photographs of typical lithium-cesium-tantalum (LCT) pegmatites in Chinese Altai. (A) Pegmatites intruding into peraluminous S-type granites. (B–C) Beryl, spodumene, and coltan in pegmatite from part A. (D) Physical contacts between pegmatites and orthogneisses metamorphosed from S-type granites. (E) Beryl in pegmatite of part D. (F) Augen gneiss with pegmatitic leucosomes. (G–H) Feldspar-quartz veins and pegmatites occurring as leucosomes, in contact with host orthogneiss.
Published: 03 December 2024
Figure 2. Field photographs of typical lithium-cesium-tantalum (LCT) pegmatites in Chinese Altai. (A) Pegmatites intruding into peraluminous S-type granites. (B–C) Beryl, spodumene, and coltan in pegmatite from part A. (D) Physical contacts between pegmatites and orthogneisses metamorphosed from
Image
Paleolatitudes of emplacement of three LCT pegmatites in the New England Appalachians, Adapted from Bradley et al. (2017).
Published: 30 September 2019
Fig. 2. Paleolatitudes of emplacement of three LCT pegmatites in the New England Appalachians, Adapted from Bradley et al . (2017) .
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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).
Published: 01 July 2016
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) .
Image
Pangea reconstruction showing distribution of representative LCT pegmatites (green squares) and location of the “Central Appalachian LCT Gap” (red double-headed arrow).
Published: 01 July 2016
Fig. 10. Pangea reconstruction showing distribution of representative LCT pegmatites (green squares) and location of the “Central Appalachian LCT Gap” (red double-headed arrow).
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(a) Li resources in LCT pegmatites as a function of time, from data summarized in Table A2 in the online appendix. (b) Ta resources in LCT pegmatites as a function of time, from data summarized in Table A3 in the online appendix. (c) Orogenic Au deposits, from Goldfarb et al. (2001).
Published: 01 April 2014
Fig. 3 (a) Li resources in LCT pegmatites as a function of time, from data summarized in Table A2 in the online appendix. (b) Ta resources in LCT pegmatites as a function of time, from data summarized in Table A3 in the online appendix. (c) Orogenic Au deposits, from Goldfarb et al. (2001) .
Image
Comparison between the age distribution of (a) LCT pegmatites and other secular trends that show the imprint of supercontinent cycles. (b) Age of detrital grains of zircon from river sands, after Campbell & Allen (2008). (c) The age of granites from Condie et al. (2009). The colored vertical bars highlight the approximate times of supercontinent assembly by collisional orogeny.
Published: 01 April 2014
Fig. 4 Comparison between the age distribution of (a) LCT pegmatites and other secular trends that show the imprint of supercontinent cycles. (b) Age of detrital grains of zircon from river sands, after Campbell & Allen (2008) . (c) The age of granites from Condie et al. (2009
Journal Article
Published: 01 February 2025
American Mineralogist (2025) 110 (2): 255–271.
... ( 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...
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Journal Article
Published: 29 September 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (5): 965–977.
...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...
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Journal Article
Published: 31 March 2025
Geochemistry: Exploration, Environment, Analysis (2025) 25 (1): geochem2024-047.
...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...
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Journal Article
Published: 01 July 2016
The Canadian Mineralogist (2016) 54 (4): 945–969.
...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) . ...
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Journal Article
Published: 01 July 2016
The Canadian Mineralogist (2016) 54 (4): 917–933.
...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...
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Journal Article
Published: 01 December 2005
The Canadian Mineralogist (2005) 43 (6): 2027–2048.
... 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...
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Journal Article
Journal: Geology
Published: 01 August 2016
Geology (2016) 44 (8): 655–658.
...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...
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