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Lithium-rich albite-topaz-lepidolite granite from central Vietnam; a mineralogical and geochemical characterization

Thi Thu Hien-Dinh, Duy Anh Dao, Tam Tran, Michael Wahl, Eckardt Stein and Reto Giere
Lithium-rich albite-topaz-lepidolite granite from central Vietnam; a mineralogical and geochemical characterization
European Journal of Mineralogy (December 2016) 29 (1): 35-52

Abstract

A potential lithium deposit has been discovered in the La Vi mining district, located in Quang Ngai Province, Central Vietnam. The Li-rich rocks (average contents: 1.3 + or - 0.9 wt.% Li (sub 2) O) are highly fractionated peraluminous granites, which are characterized by high contents of Al (sub 2) O (sub 3) , Na (sub 2) O, and K (sub 2) O, as well as F (up to 2.19 wt.%) and P (sub 2) O (sub 5) (up to 0.65 wt.%), but very low concentrations of CaO, MgO, MnO, and Fe (sub 2) O (sub 3) Among the trace elements, Rb, Cs, Sb, Nb, and Ta occur in relatively high concentrations. The granites exhibit a light pink colour and contain mainly albite, quartz, muscovite, lithian muscovite, and lepidolite, with minor amounts of amblygonite-montebrasite, herderite, fluorapatite, topaz, and cassiterite, as well as accessory beryl and goyazite. Electron microprobe analyses of amblygonite revealed high Na (sub 2) O concentrations, but these are due to the presence of micrometre-sized lacroixite inclusions. Under the optical microscope, the granite samples are characterized by a range of grain sizes and microfabrics, which indicate that the original granites were hydrothermally altered. We conclude that this late-stage alteration was associated with albitization, greisenization and Li enrichment, so that the unique features of the rare albite-topaz-lepidolite granites are probably of secondary rather than primary origin.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 29
Serial Issue: 1
Title: Lithium-rich albite-topaz-lepidolite granite from central Vietnam; a mineralogical and geochemical characterization
Affiliation: Albert-Ludwigs University, Institute of Earth and Environmental Sciences, Freiburg, Germany
Pages: 35-52
Published: 20161227
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 64
Accession Number: 2017-006181
Categories: Igneous and metamorphic petrologyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch map
N14°44'15" - N14°47'45", E108°51'05" - E108°55'18"
Secondary Affiliation: National Institute of Mining-Metallurgy Science and Technology, VNM, VietnamChonnam National University, KOR, South KoreaInstitut fuer Oberflaechen- und Schichtanalytik, DEU, GermanyTechnische Universitaet Darmstadt, DEU, GermanyUniversity of Pennsylvania, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201705
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