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Hongge |
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Sichuan, China |
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Ti V Fe
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Super Porphyry Cu and Au
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The Hongge magnetite, vanadium, titanium deposit is located in Sichuan Province, south-western China. It is ~45 km south of the similar Baima deposit, and ~30 km ENE of the Panzhihua deposit.
The deposit occurs within the Panzhihua-Xichang (Pan-Xi) intra-continental rift on the Yangtze Platform, and is hosted by a sill like layered basic-ultrabasic (gabbroic) complex that covers an area of 60 sq. km.
The Hongge layered intrusion is a member of the extensive 260 Ma Lower Emeishan Igneous Province and flood basalts of SW China.
The Hongge mafic-ultramafic intrusions are composed of clinopyroxenites and gabbros. The Hongge intrusion is an elongated lopolith that is ~16 km long and 3 to 6 km wide (Panxi Geological Unit, 1984). The surrounding country rocks are Mesoproterozoic schists and meta-sandstones in the north, Neoproterozoic dolomitic limestones in the south, and the Emeishan flood basalts in the northeast (Luan et al., 2014). In some places the intrusion is in contact with younger granite and syenite (255.2 ±3.6 Ma, Xu et al., 2008).
The Hongge intrusion is further divided, from the base upwards, into the (Hong Zhong, et al., 2004):
i). Lower zone - olivine clinopyroxenite;
ii). Middle zone, clinopyroxenite;
iii). Upper zone gabbro.
Each of these zones consists one or two compositional cycles, with distinct Mg number values, TiO2 contents and total REE levels. The most important Fe-Ti oxide mineralisation, occurring as thick, massive layers ranging in thickness from 14 to 84 m, are found in both the middle clinopyroxenite zone and upper gabbro zone.
Sampling of the Lower and Middle zone indicate they are enriched in platinum and palladium relative to iridium and ruthenium and that the Pd/Ir ratios increase progressively upwards in each cyclic unit. Chromite is the major phase controlling concentrations of iridium and ruthenium. Comparisons of these and other metal ratios suggest that each cyclic unit in the Hongge layered intrusion might have resulted from crystal fractionation and mixing between a primary and evolved magma.
The mineralisation occurs in 6 layers that are individually between 8 and 28 m thick.
No production has apparently been recorded (2006), although the deposit is at the mine stage.
Reserves are quoted by Rundqvist, et al., Vernadsky SGM, Moscow as:
1835 Mt @ 27.04% Fe, 196 Mt @ 10.57% TiO2, 14.5 Mt @ 0.24% V205.
The most recent source geological information used to prepare this decription was dated: 2006.
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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Bai Z-J, Zhong H, Naldrett A J, Zhu W-G and Xu G-W, 2012 - Whole-Rock and Mineral Composition Constraints on the Genesis of the Giant Hongge Fe-Ti-V Oxide Deposit in the Emeishan Large Igneous Province, Southwest China: in Econ. Geol. v.107 pp. 507-524
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Hong Zhong, Xin-Hua Zhou, Mei-Fu Zhou, Min Sun and Bing-Guang Liu 2002 - Platinum-group element geochemistry of the Hongge Fe-V-Ti deposit in the Pan-Xi area, southwestern China: in Mineralium Deposita v37 pp 226-239
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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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Yu, S.-Y.,Song, X.-Y., Ripley, E.M., Li, C., Chen, L.-M., She, Y.-W. and Luan, Y., 2015 - Integrated O-Sr-Nd isotope constraints on the evolution of four important Fe-Ti oxide ore-bearing mafic-ultramafic intrusions in the Emeishan large igneous province, SWChina: in Chemical Geology v.401, pp. 28-42.
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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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