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Dongping |
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Hubei, China |
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Au
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Super Porphyry Cu and Au
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The telluride rich Dongping vein gold deposit is 200 km inboard from the northern edge of the China Craton in north-west Hebei province, some 130 km north-west of Beijing.
The deposit is predominantly hosted by syenites in the southern part of the 55 x 5 to 8 km middle Palaeozoic (Variscan) Shuiquangou alkalic igneous complex which intrudes Archaean basement, and is some 10 km south of the regional Chongli-Shangyi fault zone. The Chongli-Shangyi fault zone separates the Inner Mongolian Shield to the north from the gold bearing Yanshan deformational belt to the south. The Shuiquangou complex is a composite batholith composed of several syenitic and monzonitic lithologies containing alkali feldspar, quartz, pyroxene and hornblende. Cooling has been dated at 327 to 309 Ma, with a 390 ±6 Ma recrystallisation age. A number of late Mesozoic (187 to 177 Ma) Yanshanian biotite granite plutons and dykes intrude the margins of the complex and adjacent Archaean basement. The geology of the belt is complex with NE and north trending normal & reverse faults, synforms with Jurassic sediments and antiforms with Archaean basement core and amphibolite facies metamorphosed Proterozoic and Palaeozoic cover sequences.
Mineralisation occurs as a series of parallel auriferous quartz vein swarms and coeval quartz-K feldspar veinlets occuring along 0 to 35° striking and 45 to 75°NW dipping fault zones. The veins are enveloped by altered wall rock, comprising intense, red K-feldspar development on either side of the quartz veins, generally from a few tens of centimetres to a few metres thick, locally up to 20 m. The alteration zone also frequently contains economic gold. Veins 1 and 70 are the largest containing 80% of the total gold resource. Individual veins are generally a few hundred to a few kilmetres long, 0.3 to 8 m thick and extend down dip for 200 to 600 m. The veins carry up to 3% sulphides, chiefly pyrite with lesser sphalerite, galena and chalcopyrite. Tellurides are ubiquitous and magnetite and hematite are common. The gold grade is proportional to the sulphide content. K-feldspar alteration has been dated between 148 and 177 Ma by different methods.
The deposit contains in excess of 100 tonnes of gold.
For a broader context on the setting of the Dongping deposit, see the separate Yanliao Gold Province record.
For detail see the reference(s) listed below.
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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Selected References:
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Fan, G.-H., Li, J.-W., Deng, X.-D., Gao, W.-S. and Li, S.-Y., 2021 - Age and Origin of the Dongping Au-Te Deposit in the North China Craton Revisited: Evidence from Paragenesis, Geochemistry, and In Situ U-Pb Geochronology of Garnet: in Econ. Geol. v.116, pp. 963-985.
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Li, H., Zhu, D.-P., Algeo, T.J., Li, M., Jiang, W.-C., Chen, S.F. and Elatikpo, S.M., 2023 - Pyrite trace element and S-Pb isotopic evidence for contrasting sources of metals and ligands during superimposed hydrothermal events in the Dongping gold deposit, North China: in Mineralium Deposita v.58, pp. 337-358.
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Mao J, Yinqing Li, Goldfarb R, Ying He, Klin Zaw 2003 - Fluid inclusion and noble gas studies of the Dongping Gold deposit, Hebei Province, China: a mantle connection for mineralization?: in Econ. Geol. v98 pp 517-534
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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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