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Year 2024
 
Vol 65, Issue 6, [12 - 2024] - Full papers

Geological setting and gold mineralisation characteristics at the Me Xi, Vinh Linh, Quang Tri, Vietnam

DOI:10.46326/JMES.2024.65(6).06

  • Affiliations:

    1 Hanoi University of Mining and Geology, Hanoi, Vietnam 2Center for Excellence in Analysis and Experiment, Hanoi University of Mining and Geology, Hanoi, Vietnam 3CODES ARC Centre of Excellence in Ore Deposits, University of Tasmania, Private Bag 126, Hobart, Tasmania 7001, Australia

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  • Received: 19th-May-2024
  • Revised: 31st-Aug-2024
  • Accepted: 15th-Sept-2024
  • Online: 1st-Dec-2024
Pages: 58 - 69
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Abstract:

The Me Xi gold deposit is located in Vinh Linh, Quang Tri, Truong Son Fold Belt, Vietnam, about 45 km to the east of the Sepon Mineral District, Laos PDR. Gold mineralisation at Me Xi is predominantly hosted in siltstone and subordinate calcareous siltstone, sandstone, shale, black shale and calcareous shale of Ordovician - Early Silurian Long Dai formation that were metamorphosed at greenschist facies. The igneous rocks that are closest to Me Xi deposit include undated porphyritic dolerite and mafic dykes. Two gold mineralisation zones consisting of eight mineralised bodies have been recorded, in which the main zone is ~ 640 m long and ~10÷60 m wide. The largest gold mineralisation body has a length of ~220 m and a width of ~0.5÷3 m. Gold mineralisation occurred mainly as stockwork quartz-sulphide veins that were typically characterised by the brittle deformation of host rocks. At least four hydrothermal stages were observed at the deposit, of which gold was accumulated in the stage 2 veins and possibly stage 3 veins that has similar mineralogical assemblage and alteration patterns to those of the stage 2. These stockwork stages 2 and 3 veins predominantly consist of pyrite and minor chalcopyrite, gold, arsenopyrite, pyrrhotite and galena in association with strong silicification, chloritisation, sericitisation and subordinate decalcification. The pre-Au stage 1 veins are rarely observed, but this hydrothermal stage records an initial deformation of the host sequence. The post-Au stage 4 is characterised by carbonate-rich quartz stockwork veins with local patches of sulphides.

How to Cite
., T.Xuan Le, Tran, H.Thanh, Zaw, K. and Le, T.Thi 2024. Geological setting and gold mineralisation characteristics at the Me Xi, Vinh Linh, Quang Tri, Vietnam. Journal of Mining and Earth Sciences. 65, 6 (Dec, 2024), 58-69. DOI:https://doi.org/10.46326/JMES.2024.65(6).06.
References

Axiom, (2006). Axiom Mining LTD Prospectus, CompanyReport.

Cromie, P. W. (2010). Geological setting, geochemistry and genesis of the Sepon gold and copper deposits, Laos: Ph.D Thesis v. University of Tasmania.

Dung, N. T., Anh, T. T., Hieu, P. T., Minh, P., Truong, L. X., Minh, N. T., and Hung, D. D. (2024). Crustal evolution of Paleozoic-Mesozoic granitoid in Dakrong-A Luoi area, Truong Son belt, central Vietnam: evidence from zircon U-Pb geochronology, geochemistry, and Hf isotope composition: International Geology Review, p. 1-25.

Gardner, C., Graham, I., Belousova, E., Booth, G., and Greig, A. (2017). Evidence for Ordovician subduction-related magmatism in the Truong Son terrane, SE Laos: Implications for Gondwana evolution and porphyry Cu exploration potential in SE Asia: Gondwana Research, v. 44, p. 139-156.

Hoa, T. T., Anh, T. T., Phuong, N. T., Dung, P. T., Anh, T. V., Izokh, A. E., Borisenko, A. S., Lan, C., Chung, S., and Lo, C. (2008). Permo-Triassic intermediate-felsic magmatism of the Truong Son belt, eastern margin of Indochina:

Comptes Rendus. Géoscience, v. 340, p. 112-126.

Lai, C. K., Meffre;, S., Crawford;, T., Zaw;, K., Xue;, C.-D., and Halpin;, J. (2014) The Western Ailaoshan Volcanic Belts and their SE Asia connection: A new tectonic model for the Eastern Indochina Block: Gondwana Research, http://dx.doi.org/10.1016/j.gr.2013.03.003.

Lepvrier, C., Maluski, H., Van Tich, V., Leyreloup, A., Thi, P. T., and Van Vuong, N. (2004). The early Triassic Indosinian orogeny in Vietnam (Truong Son Belt and Kontum Massif); implications for the geodynamic evolution of Indochina: Tectonophysics, v. 393, p. 87-118.

Truong, X. L, Khin, Z., Abhisit, S., Tran, T. H., Nguyen, Q. L. (2015). Gold fineness and pyrite geochemistry: Evidences for physico-chemical conditions and genesis of ore-bearing fluids at Me Xi Au Deposit, Quang Tri, Vietnam, in Vietnamese. Journal of Mining and Earth Sciences, v. 50, p. 75-82.

Manaka, T. (2014). A study of mineralogical, geochemical and geochronological characteristics and ore genesis in Phuoc Son Gold deposit area, Central Vietnam, PhD thesis, University of Tasmania.

Nevolko, P. A., Tran, T. H., Yudin, D. S., and Ngo, T. P. (2017). Ar-Ar ages of gold deposits in the Song Hien domain (NE Vietnam): Tectonic settings and comparison with Golden Triangle in China in terms of a single metallogenic province: Ore Geology Reviews, v. 89, p. 544-556.

Sam, T. D., Ai, P. V., Hac, M. V., Huan, D. V., Hung, N. V., Thanh, N. T., Tieu, L. M., and Thu, N. K. (1999).Geological Map of Thanh Son (E-48-106-D) and Linh Thuong (E-48-118-B) scaled 1:50.000, in Vietnamese. North Center Geology Division.

Shi, M.-F., Lin, F.-C., Fan, W.-Y., Deng, Q., Cong, F., Tran, M.-D., Zhu, H.-P., and Wang, H. (2015). Zircon U-Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications: Journal of Asian Earth Sciences, v. 101, p. 101-120.

Tran, T. H., Borisenko, Ngo, T. P., Izokh, Vu, V. V., Bui, A. N., Tran, T. A., Pham, T. D., (2006). Geochemistry and isotopic composition of Early and Late Mesozoic gold mineralisation in relation to magmatic activity in the southeast Indochina Terrane, in Vietnamese. Journal of Geology Series A.

Tran, T. H., Nevolko, P., Ngo, T. P., Svetlitskaya, T., Vu, H. L., Redin, Y. O., Tran, T. A., Pham, T. D., and Ngo, T. H. (2016). Geology, geochemistry and sulphur isotopes of the Hat Han gold-antimony deposit, NE Vietnam: Ore Geology Reviews, v. 78, p. 69-84.

Trong, N. H., Zong, K., Liu, Y., Yuan, Y., Hieu, P. T., Dung, L. T., and Minh, P. (2021). Early Paleozoic arc magmatism and accretionary orogenesis in the Indochina Block, Southeast Asia. The Journal of Geology, 129(1), 33-48.

Zaw, K., Meffre, S., Lai, C.-K., Burrett, C., Santosh, M., Graham, I., Manaka, T., Salam, A., Kamvong, T., and Cromie, P. (2014). Tectonics and metallogeny of mainland Southeast Asia-a review and contribution: Gondwana Research, v. 26, p. 5-30.

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