Mineral-deposit model for lithium-cesium-tantalum pegmatites

Bradley, Dwight C.; McCauley, Andrew; Stillings, Lisa L.

doi:10.3133/sir20105070o

Cited by 50 publications

(21 citation statements)

References 36 publications

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“…Most LCT pegmatites occur worldwide in supracrustal rocks metamorphosed in the upper greenschist to lower amphibolite facies and are typically located in the vicinity of evolved, S-type peraluminous granites and leucogranites from which they are inferred to be derived by fractional crystallization [18]. Pegmatites of the LCT family are characterized by enrichment in Li, Rb, Cs, Be, Sn, Nb, Ta, B, P and F, but typically have low abundances of Ti, Zr, Y and the rare earth elements (REE).…”

Section: Pegmatite Discriminationmentioning

confidence: 99%

Analysis of Garnet by Laser-Induced Breakdown Spectroscopy—Two Practical Applications

et al. 2021

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Laser-induced breakdown spectroscopy (LIBS) is a simple and straightforward technique of atomic emission spectroscopy that can provide multi-element detection and quantification in any material, in-situ and in real time because all elements emit in the 200–900 nm spectral range of the LIBS optical emission. This study evaluated two practical applications of LIBS—validation of labels assigned to garnets in museum collections and discrimination of LCT (lithium-cesium-tantalum) and NYF (niobium, yttrium and fluorine) pegmatites based on garnet geochemical fingerprinting, both of which could be implemented on site in a museum or field setting with a handheld LIBS analyzer. Major element compositions were determined using electron microprobe analysis for a suite of 208 garnets from 24 countries to determine garnet type. Both commercial laboratory and handheld analyzers were then used to acquire LIBS broadband spectra that were chemometrically processed by partial least squares discriminant analysis (PLSDA) and linear support vector machine classification (SVM). High attribution success rates (>98%) were obtained using PLSDA and SVM for the handheld data suggesting that LIBS could be used in a museum setting to assign garnet type quickly and accurately. LIBS also identifies changes in garnet composition associated with increasing mineral and chemical complexity of LCT and NYF pegmatites.

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Section: Pegmatite Discriminationmentioning

confidence: 99%

Analysis of Garnet by Laser-Induced Breakdown Spectroscopy—Two Practical Applications

et al. 2021

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“…Ore grades in rare-element pegmatites are commonly irregularly distributed [31]. Bradley et al (2017) [55] present comparative data of major, economic LCT pegmatites and demonstrate that economic pegmatites should generally contain minimum grades of 1 wt. % Li O and 0.1 wt.…”

Section: Composition Grade/tonnage and Geometrymentioning

confidence: 99%

Novel Methods and Applications for Mineral Exploration

Alexandre¹

2020

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Section: Composition Grade/tonnage and Geometrymentioning

confidence: 99%

Tools and Workflows for Grassroots Li–Cs–Ta (LCT) Pegmatite Exploration

Steiner

2019

Minerals

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The increasing demand for green technology and battery metals necessitates a review of geological exploration techniques for Li–Cs–Ta (LCT) pegmatites, which is applicable to the work of mining companies. 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. Geological exploration commonly begins with information gathering, desktop studies and Geographic Information System (GIS) data reviews. Following the identification of prospective regional areas, initial targets are verified in the field by geological mapping and geochemical sampling. Detailed mineralogical analysis and geochemical sampling of rock, soil and stream sediments represent the most important tools for providing vectors to LCT pegmatites, since the interpretation of mineralogical phases, deportment and liberation characteristics along with geochemical K/Rb, Nb/Ta and Zr/Hf metallogenic markers can detect highly evolved rocks enriched in incompatible elements of economic interest. The importance of JORC (Joint Ore Reserves Committee) 2012 guidelines with regards to obtaining geological, mineralogical and drilling data is discussed and contextualised, with the requirement of treating LCT pegmatites as industrial mineral deposits.

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Mineral-deposit model for lithium-cesium-tantalum pegmatites

Cited by 50 publications

References 36 publications

Analysis of Garnet by Laser-Induced Breakdown Spectroscopy—Two Practical Applications

Analysis of Garnet by Laser-Induced Breakdown Spectroscopy—Two Practical Applications

Novel Methods and Applications for Mineral Exploration

Tools and Workflows for Grassroots Li–Cs–Ta (LCT) Pegmatite Exploration

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