Mineralogical Characteristics and TIMS U-Pb Dating of Tantalite-(Mn) from the Bieyesamas Rare Metal Deposit, Xinjiang

HE Han-han; ARKIN Tulson; WANG Deng-hong; WANG Rui-jiang; CHEN Zhen-yu

doi:10.15898/j.cnki.11-2131/td.201912150172

Rock and Mineral Analysis > 2020 > 39(4): 609-619. > DOI: 10.15898/j.cnki.11-2131/td.201912150172

HE Han-han, ARKIN Tulson, WANG Deng-hong, WANG Rui-jiang, CHEN Zhen-yu. Mineralogical Characteristics and TIMS U-Pb Dating of Tantalite-(Mn) from the Bieyesamas Rare Metal Deposit, Xinjiang[J]. Rock and Mineral Analysis, 2020, 39(4): 609-619. DOI: 10.15898/j.cnki.11-2131/td.201912150172

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Mineralogical Characteristics and TIMS U-Pb Dating of Tantalite-(Mn) from the Bieyesamas Rare Metal Deposit, Xinjiang

1.
Beijing Institute of Geological Survey, Beijing 100195, China
2.
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
701 Team of Non-ferrous Geological Exploration Bureau of Xinjiang Uygur Autonomous Region, Changji 831100, China

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Received Date: December 14, 2019
Revised Date: February 29, 2020
Accepted Date: April 15, 2020
Published Date: June 30, 2020

Abstract

HIGHLIGHTS
(1) Mineralization of tantalite-(Mn) in the L18 pegmatite vein was formed in the Late Middle Jurassic.

ABSTRACT

BACKGROUNDTantalum is a scarce resource in China. A new breakthrough in ore prospecting was obtained on the tantalum ore in the Bieyesamasi area, Xinjiang, including new occurrences as well as the exploration of pegmatite-type rare metal resources.
OBJECTIVESTo explore the mineralization age of ore-bearing veins and the mineralogical characteristics of typical columbite-tantalite minerals, tantalite-(Mn) from L18 pegmatite veins, and to evaluate one of the most distinctive minerals in this area.
METHODSElectron microprobe was used to characterize mineralogy of tantalite-(Mn), and TIMS U-Pb geochronology of this mineral was used to constrain the age.
RESULTSThe content of Ta₂O₅ in tantalite-(Mn) from L18 pegmatite veins ranged from 51.58% to 74.80%, with an average of 68.49%, while Nb₂O₅ contents varied from 6.15% to 27.63%. Some of the major elements were unevenly distributed and did not show regular banding, with the CaO content in the center of a mineral particle lower than at the edge, and the SiO₂ content relatively stable in the cross section. TiO₂ and WO₃ showed irregular fluctuations. This feature indicated that the tantalite-(Mn) was not formed solely by crystal differentiation, but may be affected by later metasomatism.
CONCLUSIONSTIMS U-Pb dating of tantalite-(Mn) yields an age of 160Ma, indicating that the mineralization of L18 pegmatite was formed in the early period of Late Jurassic, different from the surrounding Hercynian granite. It is inferred that Hercynian granite is not the source of L18 pegmatite vein.
- tantalite-(Mn),
- Bieyesamasi deposit,
- rare metals,
- pegmatite vein,
- TIMS U-Pb dating,
- columbite-tantalite ore

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References (34)

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Mineralogical Characteristics and TIMS U-Pb Dating of Tantalite-(Mn) from the Bieyesamas Rare Metal Deposit, Xinjiang