Publication: Mineralogy, geochemistry and deposit classification of manson lode Orebody, ulu sokor, kelantan
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Date
2024-01-01
Authors
Haslikhalijah, Dauad
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Abstract
Polymetallic, gold-bearing ore deposits are found in the Manson’s Lode of Ulu Sokor, Kelantan which is hosted in Permo-Triassic meta-sedimentary and volcanoclastic rocks. Orebodies are hosted in quartz-carbonate veins or occur as replacement and disseminated in the host rock, forming the tabular shape. Mineralogy of the sulphide minerals in the eastern part of the main ore body are investigated in this thesis by identify the mineralogy of sulphide minerals associated with the polymetallic-gold deposit, determine the geochemistry of the ore bodies at every horizon and trace element geochemistry of pyrite, investigate the geological factor controlling polymetallic-gold mineralization and new gold classification for Manson’s Lode specifically. Mineralogical studies include thin section petrography, ore microscopy of polished section, mineral chemistry SEM-EDX analysis, XRD analysis for mineral identification and XRF petrochemical. Geochemistry analysis is carried out by ICP-MS and LA-ICP-MS on pyrite samples. Sulfur isotopes measurement of pyrite from two zones and one sample of quartz veins analyzed for fluid inclusion. The eastern part is dominated with pyrite-galena-sphalerite-chalcopyrite mineral assemblage associated with gold that forms several layers with different sulphides mineral association. Sulphide minerals present in the upper layered ore are pyrite and galena in veins along shears including finely disseminated pyrite in silty rocks. Disseminated pyrite in the host rocks occurs either as euhedral-subhedral crystals or fine to coarse grains in the quartz vein. Veins that contain galena and sphalerite-vein are observable in the lower layered ores. Disseminated to massive pyrite minerals locally occur associated with sphalerite. Chalcopyrite can be observed infilling cracks mostly found in sphalerite and erratically in pyrite. The gangue minerals include quartz and carbonates consisting of calcite, siderite, and dolomite. Overall, Manson’s Eastern lode has a metal assemblage consisting of Fe, Zn, Pb, Au, As, Ag, Cu. The sulfur isotopic composition of pyrite in Manson’s Lode was yield almost same with Selinsing deposit that widely referred to as mesothermal or orogenic lode gold deposit. The fluid inclusions are one to two-phase, liquid-vapour (CO2) inclusions where liquid and vapour homogenized to liquid. Homogenisation temperature ranging from 181°C to 245°C (mean 209°C) and salinity varying from 0.7 to 2.7 wt% NaCl equivalent are typical of an orogenic system. The host rock was subjected to regional low-grade metamorphism, which may imply the circulation of metamorphic and/or without intrusive source fluids related to the Permo-Triassic orogenic event.