Geochemical - geology characteristics implicating original sources and copper - deposit type in Kon Ra ore - field

  • Organ:
    1 Department of Geochemistry and Environment, Vietnam Institute of Sciences and Mineral Resources, Vietnam
    2 South Vietnam Geological Mapping Division, Vietnam3 General Department of Geology and Minerals in Viet Nam, Vietnam
  • Keywords: Cooper deposit type.Geochemistry - geology,Kon Ra,Skarnoid.
  • Received: 18th-June-2021
  • Accepted: 29th-Aug-2021
  • Available online: 31st-Oct-2021
Pages: 12 - 28
View: 458

Abstract:

Based on the research results on petrographic - mineralogical characteristics, tectonic structural features, geochemistry of major and trace elements of the bedrock, alternative rock, ore, soil, mineralogical geochemistry, mineral facies, inclusions, the origin of ore formation related to oxidized granite and skarnoid - typed metasomatic process in Kon Ra copper ore field have been identified. Petrological and mineral characteristics indicate the process of transitional metasomatism between the skarn and hornfels, also known as bimetasomatic stage (skarnoid deposit type). Diopxite represents the Progade skarnoid stage. Tremolite, actinolite, quartz, chlorite, magnetite, molybdenite, less of chalcopyrite, pyrrhotite, and pyrite indicate the retrogade skarnoid stage. The following is sulfide - quartz stage (major minerals include: quartz, chalcopyrite, pyrite, pyrrhotite, molybdenite). This result is also consistent with the formation temperature 210÷270 0C and the geochemical zoning of elements from intrusive blocks through the outer contact zone that contains the ore and surrounding rocks are as follows: Cu, Zn, Ca (the zone has lime-rich formations), Fe3+, Mo increases in the outer contact zone containing ore closed to acid intrusive rocks. Inversely, the ratios of Pb/Cu, Zn/Cu, and As content increased in the alteration from this zone to the outer one. In addition, uranium mineralization is associated with a later magma stage (pegmatite granite in endo-contact is high uranium radiation: U = 0.17÷0.2%, 3,420,000÷8,020,000 µR/h and contains uraninite).

How to Cite
Nguyen, N.Van, Nguyen, D.Tien, Tran, D., Mai, T.Trong, Do, N.Duc, Duong, H.Cong and Pham, V.Huu Bui Thanh Hung 2021. Geochemical - geology characteristics implicating original sources and copper - deposit type in Kon Ra ore - field (in Vietnamese). Journal of Mining and Earth Sciences. 62, 5 (Oct, 2021), 12-28. DOI:https://doi.org/10.46326/JMES.2021.62(5).02.
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