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Geology, geochemistry and metallogenesis of the Selinsing gold deposit, central Malaysia

Citation

Makoundi, C and Zaw, K and Large, RR and Meffre, S and Lai, C-K and Hoe, TG, Geology, geochemistry and metallogenesis of the Selinsing gold deposit, central Malaysia, Gondwana Research, 26, (1) pp. 241-261. ISSN 1342-937X (2014) [Refereed Article]

Copyright Statement

Copyright 2013 International Association for Gondwana Research

DOI: doi:10.1016/j.gr.2013.08.023

Abstract

Malaysia is endowed with a number of major sediment-hosted, orogenic gold deposits that lie parallel to but east of the Bentong-Raub Suture Zone, which runs approximately NS in central Malaysia. The Selinsing gold deposit is one of the major economic deposits in central Malaysia and is hosted by (meta)-sedimentary units. The deposit is affected by later deformation and metamorphism during the Triassic due to the collision of the Sibumasu Terrane with the Sukhothai Arc. Laser ablation ICP-MS UPb zircon dating of the host rocks indicates a Carboniferous (ca. 331300Ma) maximum depositional age. Ore minerals include pyrite, arsenopyrite, galena, sphalerite, chalcopyrite, pyrrhotite and gold. Detailed textural and geochemical studies revealed five distinctive pyrite types, sub-rounded framboidal pyrite (Pyrite 1), rounded recrystallized pyrite (Pyrite 2), anhedral inclusion-rich pyrite (Pyrite 3), anhedral to subhedral clean pyrite (Pyrite 4) and coarse euhedral clean pyrite (Pyrite 5). Laser ablation ICP-MS trace element analysis of the framboidal pyrite indicates enrichment in V, As, Mo, Ni, Se, Te, Ag, and Zn relative to the other pyrite types. Pyrite sulfur isotope composition (1.29.2) suggests a likely mixture of magmatic and local sedimentary source for the sulfur. Pyrite Pb isotope results (Pb206/Pb204: 18.9419.10; Pb207/Pb204: 15.7215.73) suggest a high-U source rock for the lead. Fluid inclusions are CO2-rich (95100mol%) and yielded homogenization temperatures from 194 to 348C and salinities between 1.23 and 9.98wt.% NaCl equiv. suggesting involvement of metamorphic fluids during ore formation. Based on these results, we suggest a two-stage model for the formation of the gold deposit at Selinsing. Stage 1 consists of early enrichment of the elements Au, V, As, Mo, Se, Te, Ni, Ag, and Zn in framboidal pyrite in the sediments, whereas Stage 2 is characterized by multiple post-diagenetic deformation and metamorphic processes, favoring the development of fluid pathways and Au remobilization into later pyrites. Regionally, the Selinsing gold deposit shares geological similarities (in term of host rocks, ore mineralogy and geochemistry) with many other sediment-hosted, orogenic gold deposits in mainland SE Asia such as the Sepon gold deposit (Laos), Langu gold deposit (Thailand), Modi Taung and Meyon gold deposits (Myanmar), and Phuoc Son gold deposit (central Vietnam). We suggest that our two-stage model may have important implications to mineral exploration for future research on sediment-hosted/orogenic gold deposits in SE Asia.

Item Details

Item Type:Refereed Article
Keywords:Malaysia, Selinsing, Bentong-Raub Suture, orogenic Au deposits, laser ablation ICP-MS, pyrite geochemistry
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Makoundi, C (Mr Charles Makoundi)
Author:Zaw, K (Professor Khin Zaw)
Author:Large, RR (Professor Ross Large)
Author:Meffre, S (Dr Sebastien Meffre)
Author:Lai, C-K (Dr Chun Lai)
ID Code:98092
Year Published:2014
Web of Science® Times Cited:4
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2015-02-02
Last Modified:2015-04-23
Downloads:0

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