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Tuanjiegou |
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Heilongjiang, China |
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Au Cu
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Super Porphyry Cu and Au
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The Tuanjiegou breccia-hosted epithermal gold deposit, is located about 400 km NNE of the city of Harbin in Heilongjiang, only 40 km from the Russian border (#Location: 48° 22' 22"N, 130° 15' 35"E).
The deposit lies between a local Mesozoic graben and a Proterozoic basement uplift. The setting at the time of ore deposition is interpreted to represent an initial back-arc rift that developed into a continental margin island arc environment associated with Late Mesozoic subduction of the Pacific Plate. Mineralisation is hosted in a subvolcanic granitic porphyry that was emplaced into a Mesozoic caldera, that is in turn localised by the intersection of NNE- and east-west trending structures.
Tuanjiegou has been interpreted to be a subvolcanic porphyry, although its mineral assemblages, alteration styles and ore textures are all characteristic of epithermal systems.
Gold mineralisation is predominantly disseminated in breccia within or along the margins of the Cretaceous 113 to 92 Ma (Yanshanian) host rhyolitic porphyry. The main stage volcanism is dated at 113±1.1 Ma, whilst the granodiorite porphyry and granite porphyry were emplaced at 107.0±1.2 Ma and 103 to 102 Ma, respectively, with ore deposition at 102 to 100 Ma (Sun et al., 2013). The intruded country rock comprises Cretaceous volcanic rocks overlying Proterozoic basement.
The major orebodies strike WNW and dip 40 to 50°N. They are 250 to 725 m long, 11 to 68 m thick, and have been traced to depths of between110 and 375 m.
The principal ore minerals are pyrite and marcasite with lesser stibnite, chalcopyrite, galena, cinnabar, realgar and orpiment. Alteration minerals are characterised by low temperature assemblages of chalcedony, adularia, opal, ankerite, calcite and kaolinite. Gold is dominantly associated with pyrite and chalcedony.
The deposit is reported to contain >60 t of Au at grades of 7.5 g/t Au.
The most recent source geological information used to prepare this decription was dated: 2002.
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.
Tuanjiegou
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Selected References:
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Sun, J.-G., Han, S.-J., Zhang, Y., Xing, S.-W. and Bai, L.-A., 2013 - Diagenesis and metallogenetic mechanisms of the Tuanjiegou gold deposit from the Lesser Xingan Range, NE China: Zircon U-Pb geochronology and Lu-Hf isotopic constraints: in J. of Asian Earth Sciences v.62, pp. 373-388.
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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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