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Duobaoshan, Tongshan |
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Inner Mongolia, China |
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Cu Au Mo
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Super Porphyry Cu and Au
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The Duobaoshan Cu-Au-Mo deposit and Tongshan Cu-Mo, ~11 km to the north, both lie within the Xinganling block of Inner Mongolia (Heilongjiang Province) in northeastern China (#Location: Duobaoshan - 50° 8' 1"N, 125° 47' 34"E; Tongshan - 50° 14' 47"N, 125° 47' 5"E).
Duobaoshan is associated with granodioritic rocks, intruding Proterozoic metamorphic basement of the Hinggan belt, and Lower Palaeozoic arc volcanics of the Tuva-Mongol arc, exposed on the eastern flank of the Early Yanshanian (Late Jurassic to Early Cretaceous) Greater Hinggan magmatic arc. The presence of Palaeoproterozoic metamorphic basement (1.85 Ga) is indicated by SHRIMP U-Pb zircon geochronologic studies (Miao et al., 2007), which was further metamorphosed during the early Palaeozoic (~500 Ma; Yakubchuk et al., 2012). This metamorphic terrane also hosts meta-igneous rocks with 547±46 to 506±10 Ma ages. In addition, ophiolite with a formational age of 654±9 Ma indicates Neoproterozic oceanic crust in a suture just 40 km northwest of the deposit (Miao et al., 2007).
For detail of the regional setting of this part of the Central Asian and Palaeo-Pacific orogenic belts see the separate Manchuria Overview record that will be available soon.
The country rock at Duobaoshan comprises a Caledonide sequence of andesitic to dacitic arc-related volcanic and volcaniclastic rocks of the Ordovician Duobaoshan Formation, overlain by Silurian sediments. The volcanic rocks of the Duobaoshan Formation show an alkalic to calc-alkalic trend and were intruded by a composite granodioritic complex predominantly composed of granodiorite and granodiorite porphyry. This intrusive mass covers an exposed area of 8 sq km within an arcuate, northwest-southeast trending structual zone. Two strongly altered, lens-like, NW striking and SW dipping granodiorite porphyry bodies with exposed areas of 0.08 and 0.09 sq km respectively are located within the centre of the granodiorite. The granodiorite and granodiorite porphyry have been dated by K-Ar isotopes at 292 and 283 Ma respectively (Zhao et al., 2005). However, these ages have been proven wrong by Zeng et al. (2014), who dated molybdenite, using Re-Os, and zircon, using U-Pb (LA_ICP-MS), obtaining early Ordovician ages of 476 and 477 Ma, respectively). Liu et al. (2012) similarly records an Re-Os age a 484 Ma age for Duobaoshan molybdenite. These age data also suggest the Duobaoshan and Tongshan porphyry systems are related to calc-alkaline igneous activity associated with a continental margin magmatic arc (Zeng et al., 2014.
Mineralisation is associated with a northwest-southeast corridor of alteration that extends across the granodiorite mass over a length in excess of 6 km and comprise a large number of lenticular mineralised zones that define the orebodies. The largest of these is Orebody No. 3 which occurs in the hangingwall of the granodiorite porphyry and is associated with an episode of phyllic sericite and quartz-sericite alteration that overprints an earlier potassic phase characterised by intense silicification of the granodiorite porphyry margin, surrounded progressively outwards by K feldspar and then biotite alteration which grades to a periphery that was subjected to propylitic alteration. The phyllic phase overprints the potassic zone near its transition to the propylitic zone. The bulk of the mineralisation was emplaced outside of the granodiorite porphyry, predominantly within the granodiorite mass, but also partially within the Ordovician volcanic wall rock. The core of Orebody No. 3 is occupied by a bornite rich core which passes outwards into chalcopyrite and a pyritic halo. The accompanying ore minerals include pyrite, cuprite and covellite (Zhao et al., 2005; 1995; Yin et al., 1997; Du, 2004).
Duobaoshan is reported to have a resource of 951 Mt @ 0.46% Cu, 0.13 g/t Au, 2 g/t Ag, 0.02% Mo (Singer et al., 2008), while Tongshan is believed to contain 180 Mt @ 0.47% Cu, 0.023% Mo (Zhao et al., 2005, Mutschler et al., 2000).
The most recent source geological information used to prepare this decription was dated: 2005.
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.
Duobaoshan Tongshan
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Selected References:
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Cai, W.-Y., Wang, K.-Y., Li, J., Fu, J.-L., Lai, C.K. and Liu, H.-L., 2020 - Geology, geochronology and geochemistry of large Duobaoshan Cu-Mo-Au orefield in NE China: Magma genesis and regional tectonic implications: in Geoscience Frontiers v.11, 27p. doi.org/10.1016/j.gsf.2020.04.013
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Chen, Y.-J., Zhang, C., Wang, P., Pirajno, F. and Li, N., 2017 - The Mo deposits of Northeast China: A powerful indicator of tectonic settings and associated evolutionary trends: in Ore Geology Reviews v.81, pp. 602-640.
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Gao, J., Klemd, R., Zhu, M., Wang, X., Li, J., Wan, B., Xiao, W., Zeng, Q., Shen, PO., Sun J., Qin, K. and Campos, E., 2017 - Large-scale porphyry-type mineralization in the Central Asian metallogenic domain: A review: in J. of Asian Earth Sciences Available on-line from October 18, 2017, 30p.
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Gao, J., Qin, K., Zhou, M.-F. and Zaw, K., 2018 - Large-scale porphyry-type mineralization in the Central Asian Metallogenic Domain: Geodynamic background, magmatism, fluid activity and metallogenesis: in J. of Asian Earth Sciences Online, https://doi.org/10.1016/j.jseaes.2018.08.023.
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Hu, X.-L., Yao, S.-Z., Ding, Z.-J. and He, M-Z., 2017 - Early Paleozoic magmatism and metallogeny in Northeast China: a record from the Tongshan porphyry Cu deposit: in Mineralium Deposita v.52, pp. 85-103.
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Huang, W., Liang, H.-Y., Wub, J., Zoua, Y.-Q. and Zhang, J., 2017 - Formation of porphyry Mo deposit in a deep fault zone, example from the Dabaoshan porphyry Mo deposit in northern Guangdong, South China: in Ore Geology Reviews v.81, pp. 940-952.
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Liu, J., Li, Y., Zhou, Z.-H. and OuYang, H.-G., 2017 - The Ordovician igneous rocks with high Sr/Y at the Tongshan porphyry copper deposit, satellite of the Duobaoshan deposit, and their metallogenic role: in Ore Geology Reviews v.86, pp. 600-614.
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Mao, W., Rusk, B., Yang, F. and Zhang, M., 2017 - Physical and Chemical Evolution of the Dabaoshan Porphyry Mo Deposit, South China: Insights from Fluid Inclusions, Cathodoluminescence, and Trace Elements in Quartz: in Econ. Geol. v.112, pp. 889-918.
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Seltmann, R., Dolgopolova, A. and CERCAMS team, 2012 - Porphyry Cu-Au/Mo Deposits of Central Eurasia: Geodynamics and Metallogeny: in Existing Resources, New Horizons, KazGeo 2012, Almaty, Kazakhstan, 29-31 October 2012, Conference Proceedings, 4p.
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Yakubchuk, A., Degtyarev, K., Maslennikov, V., Wurst, A., Stekhin, A. and Lobanov, K., 2012 - Tectonomagmatic Settings, Architecture, and Metallogeny of the Central Asian Copper Province: in Hedenquist J W, Harris M and Camus F, 2012 Geology and Genesis of Major Copper Deposits and Districts of the World - A tribute to Richard H Sillitoe, Society of Economic Geologists Special Publication 16, pp. 403-432
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Zeng, Q., Qin, K., Liu, J., Li, G., Zhai, M., Chu, S. and Gua, Y., 2015 - Porphyry molybdenum deposits in the Tianshan-Xingmeng orogenic belt, northern China: in International Journal of Earth Science (Geologische Rundschau) v.104, pp. 991-1023.
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Zhao, C., Qin, K., Song, G., Li, G., Li, Z., Pang, X. and Wang, L., 2018 - Petrogenesis and tectonic setting of ore-related porphyry in the Duobaoshan Cu deposit within the eastern Central Asian Orogenic Belt, Heilongjiang Province, NE China: in J. of Asian Earth Sciences Online https://doi.org/10.1016/j.jseaes.2018.07.002
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Zhao, C., Qin, K.-Z., Song, G.-X., Li, G.-M. and Li, Z.-Z., 2019 - Early Palaeozoic high-Mg basalt-andesite suite in the Duobaoshan Porphyry Cu deposit, NE China: Constraints on petrogenesis, mineralization, and tectonic setting: in Gondwana Research v.71, pp. 91-116.
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| References in PGC Publishing Books: | |
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Seltmann R and Porter T M, 2005 - The Porphyry Cu-Au/Mo Deposits of Central Eurasia: 1. Tectonic, Geologic & Metallogenic Setting and Significant Deposits, in Porter T M, (Ed), Super Porphyry Copper and Gold Deposits: A Global Perspective, v2 pp 467-512
 Abstract
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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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