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Year 2024
 
Issue 1 [02 - 2024], Year XXXIII

Multiple sources for rare earth and Fe-Cu mineralization in the Sin Quyen, Lao Cai IOCG deposit insight from in-situ Nd isotope analysis of Titanite

https://mij.hoimovietnam.vn/en/archives?article=24016

  • Affiliations:

    1 Vietnam Institute of Geosiences and Mineral Resources
    2 Hanoi Hanoi University of Mining and Geology
    3 Radioactive and Rare Mineral Division, Geological Department of Vietnam

  • *Corresponding:
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  • Received: 4th-Nov-2023
  • Revised: 15th-Dec-2023
  • Accepted: 18th-Dec-2023
  • Online: 28th-Feb-2024
Pages: 54 - 62
Views: 191
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Abstract:

IOCG deposits usually preserve evidence of multiple hydrothermal events and superimpose processesdue to their prolonged geological history. Consequently, establishing precise constraints on the sourcesand ore-forming processes of IOCG deposits is challenging. Recently, the in-situ Laser Ablation MultiCollector Inductively Coupled Plasma Mass Spectrometry (LA-MC-ICPMS) technique has been widelyused in dating and tracing hydrothermal ore deposits with complex evolutionary histories. In this study, weapply in-situ LA-MC-ICPMS Nd isotope analysis to two types of titanite from the Sin Quyen IOCG depositin northwestern Vietnam to decipher the origin and ore-forming processes of the giant rare earth element(REE) and Fe-Cu deposit. Type 1 titanite (Ttn1) consists mainly of euhedral to subhedral crystals, withdiameters ranging from 0.5 to 2 mm, closely associated with amphibole and allanite. In contrast, type 2titanite (Ttn2) is characterized by uniform, fine grains closely associated with magnetite and chalcopyrite.Ttn1 displayed εNd(t) values ranging from −6.4 to −5.7‰, overlapping with the Nd values of the meta-sedimentary basement rocks at Sin Quyen deposit. Conversely, Ttn2 yielded values within the range of−4.3 to −2.0‰, similar to felsic intrusions in the region. The significant variation in Nd isotopes betweenthe two types of titanite at Sin Quyen indicates different sources contributing to the REE and Fe-Cumineralization at the Sin Quyen deposit. This finding may inspire other IOCG deposits with complexevolutionary histories.

How to Cite
Ngo, D.Xuan, Trinh, S.Hai, Quach, T.Duc, Vu, H.Manh, Khuong, H.The and Phan, G.Hoang 2024. Multiple sources for rare earth and Fe-Cu mineralization in the Sin Quyen, Lao Cai IOCG deposit insight from in-situ Nd isotope analysis of Titanite (in Vietnamese). Mining Industry Journal. XXXIII, 1 (Feb, 2024), 54-62. .
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