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Yangliuping, Zhengziyanwuo |
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Sichuan, China |
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Ni Co Cu PGE PGM
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Yangliuping and Zhengziyanwuo Ni-Cu-PGE sulphide deposits are located in the Yangliuping district of Sichuan Province in south-western China.
These depsoits are hosted by mafi-ultramafic sills of Permian age, which are sub-volcanic intrusions related to the Dashibao Basalt, part of the extensive Emeishal continental flood basalt of the Emeishan Igneous Province which covers an area of up to 0.5 million sq. km and is from several hundred to 5000 m thick.
The mineralised sills are exposed in the core of a dome surrounded by the overlying basalts and are from 200 to 300 m thick with exposed strike lengths of 1 to 2 km. They are now composed principally of serpentinite, talc schist, tremolite schist and meta-gabbro and intrude Devonian carbonaceous marble and graphitic schist.
Ni-Cu mineralisation is found as disseminations in the lower parts of the serpentinite, with massive sulphides at the base of the sill and in the footwall, filling fractures below the serpentinite.
The sulphides show relict cumulate textures, although they have been subsequently strongly modified by hydrothermal alteration.
The massive sulphides occur as lenses with lengths of up to 200 m, widths of <40 m and thicknesses of 0.2 to 0.3 m with 85 to 95% sulphides, mainly pyrrhotite and pentlandite with chalcopyrite increasing towards the margins where it can be up to 30%.
Around 95% of the resource is present as disseminations, which in the two deposits are each around 1000 m long, usually around or <80 m (but locally >100 m) thick with 20 to 30% sulphides (from top to base). The disseminated sulphides average 70% pyrrhotite, 10 to 20% pentlandite and <20% chalcopyrite.
The massive ores average 1.2 to 4.18 wt% Ni, 0.02 to 0.1 wt% Co, 0.54 to 0.67 wt% Cu, 1.75 to 3.53 g/t PGE.
The average grade of disseminated sulphides is around 0.24 to 1.16 wt% Ni, 0.01 to 0.04 wt% Co, 0.08 to 0.44 wt% Cu, 0.22 to 1.54 g/t PGE.
The most recent source geological information used to prepare this decription was dated: 2003.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Liang, Q.-L., Song, X.-Y., Long, T.-M., Wirth, R. and Dai, Z.-H., 2023 - The effect of platinum-group minerals on differentiation of platinum-group elements in magmatic sulfide deposits: Evidence from the Cu-Ni-PGE deposits in the Yangliuping area of the Emeishan large igneous province, SW China: in Chemical Geology v.636, doi.org/10.1016/j.chemgeo.2023.121645
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Tang, Q., Li, C., Liu, C., Xue, S.,Xu, S., Zhang, Y., Li, Z., Bao, J. and Song, H., 2023 - Contrasting magmatic controls on the genesis of Fe-Ti-V oxide deposits in the Emeishan large igneous province using apatite Sr-Nd isotopes and apatite-zircon trace elements: in Mineralium Deposita v.58, pp. 1279–1296. doi.org/10.1007/s00126-023-01180-0.
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Xie-Yan Song, Mei-Fu Zhou, Zhi-Min Cao, et al. 2003 - Ni-Cu-(PGE) magmatic sulfide deposits in the Yangliuping area, Permian Emeishan igneous province, SW China: in Mineralium Deposita v38 pp 831-843
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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