金川矿床3号矿体成矿过程及对成矿模式的启示
王亚磊 , 李文渊 , 王永才 , 张照伟 , 艾启兴 , 黑欢
地球科学 ›› 2026, Vol. 51 ›› Issue (01) : 240 -256.
金川矿床3号矿体成矿过程及对成矿模式的启示
Mineralization Process of No.3 Orebody of Jinchuan Deposit and New Implication for Metallogenic Model
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为查明金川矿床3号矿体成矿过程、深化成矿模式,利用电子探针、全岩主微量,Ni、Cu及PGE元素分析等方法,获取3号矿体中细粒及伟晶状二辉橄榄岩中橄榄石Fo值及Ni含量为82.4%~85%和1 069×10‒6~2 420×10‒6;Fo值及Ni含量具有由北西向南东逐渐变高趋势.主量元素变化表明3号矿体主要发生了橄榄石和辉石的分离结晶;赋矿岩体略富集轻稀土元素,明显富集LILE而亏损HFSE.3号矿体铂族元素含量与24号矿体相似,明显高于1号和2号矿体.3号矿体南东方向深部仍存在基性程度更高且含矿性更好的矿体,金川矿床是“幔源岩浆深部硫化物熔离‒含矿岩浆多中心”侵位的产物,3号和24号矿体共用同一岩浆通道,1号和2号矿体是含矿岩浆沿不同通道分别侵位的产物.
To elucidate the mineralization process of the No.3 orebody of the Jinchuan deposit and to refine the Jinchuan metallogenic model, it conducted EPMA of ore minerals together with whole-rock major-trace element and Ni-Cu-PGE analyses. Olivine from the fine-grained and pegmatitic lherzolite hosting the No.3 orebody shows Fo values of 82.4%-85.0% and Ni contents of 1 069×10⁻⁶-2 420×10⁻⁶. Both Fo and olivine Ni content increase progressively from the northwest to the southeast. Major-element variations suggest that the No.3 orebody experienced dominantly olivine- and pyroxene-controlled fractional crystallization. The ore-bearing rocks are slightly enriched in light rare earth elements (LREE), markedly enriched in large-ion lithophile elements (LILE), and depleted in high-field-strength elements (HFSE). The total PGE abundances of the No.3 orebody are comparable to those of the No.24 orebody, but are significantly higher than those of the No.1 and No.2 orebodies. Importantly, the southeastern segment of the No.3 orebody remains relatively more mafic and therefore retains greater mineralization potential. These observations support a metallogenic model in which the Jinchuan deposit formed through “mantle-derived magma, sulfide segregation, and multi-center emplacement of mineralized magma”. The No.3 and No.24 orebodies were supplied by the same magma conduit, whereas the No. 1 and No. 2 orebodies were fed by separate conduits.
| [1] |
Anders, E., Grevesse, N., 1989. Abundances of the Elements: Meteoritic and Solar. Geochimica et Cosmochimica Acta, 53(1): 197-214. https://doi.org/10.1016/0016⁃7037(89)90286⁃X |
| [2] |
Ballhaus, C., Tredoux, M., Späth, A., 2001. Phase Relations in the Fe⁃Ni⁃Cu⁃PGE⁃S System at Magmatic Temperature and Application to Massive Sulphide Ores of the Sudbury Igneous Complex. Journal of Petrology, 42(10): 1911-1926. https://doi.org/10.1093/petrology/42.10.1911 |
| [3] |
Barnes, S. J., Cruden, A. R., Arndt, N., et al., 2016. The Mineral System Approach Applied to Magmatic Ni⁃Cu⁃PGE Sulphide Deposits. Ore Geology Reviews, 76: 296-316. https://doi.org/10.1016/j.oregeorev.2015.06.012 |
| [4] |
Barnes, S.J., Lightfoot, P.C., 2005. Formation of Magmatic Nickel Sulfide Deposits and Processes Affecting Their Copper and Platinum Group Element Contents. Economic Geology 100th Anniversary Volume, 34: 179-213. https://doi.org/10.5382/AV100.08. |
| [5] |
Barnes, S. J., Mungall, J. E., Le Vaillant, M., et al., 2017. Sulfide⁃Silicate Textures in Magmatic Ni⁃Cu⁃PGE Sulfide Ore Deposits: Disseminated and Net⁃Textured Ores. American Mineralogist, 102(3): 473-506. https://doi.org/10.2138/am⁃2017⁃5754 |
| [6] |
Barnes, S. J., Zientek, M. L., Severson, M. J., 1997. Ni, Cu, Au, and Platinum⁃Group Element Contents of Sulphides Associated with Intraplate Magmatism: A Synthesis. Canadian Journal of Earth Sciences, 34(4): 337-351. https://doi.org/10.1139/e17⁃030 |
| [7] |
Campbell, I. H., Naldrett, A. J., 1979. The Influence of Silicate:Sulfide Ratios on the Geochemistry of Magmatic Sulfides. Economic Geology, 74(6): 1503-1506. https://doi.org/10.2113/gsecongeo.74.6.1503 |
| [8] |
Chai, G., Naldrett, A. J., 1992a. The Jinchuan Ultramafic Intrusion: Cumulate of a High⁃Mg Basaltic Magma. Journal of Petrology, 33(2): 277-303. https://doi.org/10.1093/petrology/33.2.277 |
| [9] |
Chai, G., Naldrett., A. J., 1992b. Characteristics of Ni⁃Cu⁃PGE Mineralization and Genesis of the Jinchuan Deposit, Northwest China. Economic Geology, 87(6): 1475-1495. https://doi.org/10.2113/gsecongeo.87.6.1475 |
| [10] |
Chen, L.M., 2009. Features and Genesis of Segment I and Its Hosted Ni⁃Cu Sulfide Deposit of the Jinchuan Intrusion, Gansu, Province (Dissertation). Institute of Geochemistry, Chinese Academy of Sciences, Guiyang (in Chinese with English abstract). |
| [11] |
Chen, L. M., Song, X. Y., Keays, R. R., et al., 2013. Segregation and Fractionation of Magmatic Ni⁃Cu⁃PGE Sulfides in the Western Jinchuan Intrusion, Northwestern China: Insights from Platinum Group Element Geochemistry. Economic Geology, 108(8): 1793-1811. https://doi.org/10.2113/econgeo.108.8.1793 |
| [12] |
Duan, J., Li, C. S., Qian, Z. Z., et al., 2016. Multiple S Isotopes, Zircon Hf Isotopes, Whole⁃Rock Sr⁃Nd Isotopes, and Spatial Variations of PGE Tenors in the Jinchuan Ni⁃Cu⁃PGE Deposit, NW China. Mineralium Deposita, 51(4): 557-574. https://doi.org/10.1007/s00126⁃015⁃0626⁃8 |
| [13] |
Duan, J., Qian, Z. Z., Jiao, J. G., et al., 2015. Genesis of Xijing Intrusion from Longshoushan Terrane and the Tectonic Significance. Journal of Jilin University (Earth Science Edition), 45(3): 832-846 (in Chinese with English abstract). |
| [14] |
Fleet, M. E., Crocket, J. H., Stone, W. E., 1996. Partitioning of Platinum⁃Group Elements (Os, Ir, Ru, Pt, Pd) and Gold between Sulfide Liquid and Basalt Melt. Geochimica et Cosmochimica Acta, 60(13): 2397-2412. https://doi.org/10.1016/0016⁃7037(96)00100⁃7 |
| [15] |
Gong, J. H., Zhang, J. X., Wang, Z. Q., et al., 2016. Origin of the Alxa Block, Western China: New Evidence from Zircon U⁃Pb Geochronology and Hf Isotopes of the Longshoushan Complex. Gondwana Research, 36: 359-375. https://doi.org/10.1016/j.gr.2015.06.014 |
| [16] |
Gong, J. H., Zhang, J. X., Yu, S. Y., 2011. The Origin of Longshoushan Group and Associated Rocks in the Southern Part of the Alxa Block: Constraint from LA⁃ICP⁃MS U⁃Pb Zircon Dating. Acta Petrologica et Mineralogica, 30(5): 795-818 (in Chinese with English abstract). |
| [17] |
Jiao, J. G., Jin, S. F., Rui, H. C., et al., 2017. Petrology, Geochemistry and Chronology Study of the Xiaokouzi Mafic⁃Ultramafic Intrusion in the Eastern Section of Longshou Mountains, Gansu. Acta Geologica Sinica, 91(4): 736-747 (in Chinese with English abstract). |
| [18] |
Jiao, J.G., Tang, Z.L., Yan, H.Q., et al., 2012. Magmatic Mass Balance and Metallogenic Process of Jinchuan Cu⁃Ni Sulfide Deposit. Mineral Deposits, 31(6):1135-1148 (in Chinese with English abstract). |
| [19] |
Kang, J., Song, X. Y., Long, T. M., et al., 2022. Lithologic and Geochemical Constraints on the Genesis of a Newly Discovered Orebody in the Jinchuan Intrusion, NW China. Economic Geology, 117(8): 1809-1825. https://doi.org/10.5382/econgeo.4911 |
| [20] |
Li, C.S., Naldrett, A. J., 1999. Geology and Petrology of the Voisey’s Bay Intrusion: Reaction of Olivine with Sulfide and Silicate Liquids. Lithos, 47(1-2): 1-31. https://doi.org/10.1016/S0024⁃4937(99)00005⁃5 |
| [21] |
Li, C.S., Ripley, E.M., 2011. The Giant Jinchuan Ni⁃Cu⁃(PGE) Deposit: Tectonic Setting, Magma Evolution, Ore Genesis and Exploration Implications. Review Economic Geology, 17:163-180. |
| [22] |
Li, C. S., Xu, Z. H., de Waal, S. A., et al., 2004. Compositional Variations of Olivine from the Jinchuan Ni⁃Cu Sulfide Deposit, Western China: Implications for Ore Genesis. Mineralium Deposita, 39(2): 159-172. https://doi.org/10.1007/s00126⁃003⁃0389⁃5 |
| [23] |
Li, L.J., Mao, X.C., Liu, Z.K., et al.,2025. Multi⁃Stage Magma Emplacement in the Western End of the Jinchuan Ni⁃Cu Sulfide Deposit, NW China, and Mineral Exploration Strategy Based on Exploration Data. Journal of Geochemical Exploration, 268:107615. https://doi.org/10.1016/j.gexplo.2024.107615 |
| [24] |
Li, X. H., Su, L., Chung, S. L., et al., 2005. Formation of the Jinchuan Ultramafic Intrusion and the World’s Third Largest Ni⁃Cu Sulfide Deposit: Associated with the ∼825 Ma South China Mantle Plume? Geochemistry, Geophysics, Geosystems, 6(11): 1-16. https://doi.org/10.1029/2005gc001006 |
| [25] |
Long, T. M., Song, X. Y., Kang, J., et al., 2023. Genesis of No. 2 Orebody of the Jinchuan Magmatic Ni⁃Cu⁃(PGE) Sulfide Deposit, NW China: New Constraints from the Newly Discovered Deep Extension. Mineralium Deposita, 58(7): 1317-1332. https://doi.org/10.1007/s00126⁃023⁃01184⁃w |
| [26] |
Mao, X. C., Su, Z., Deng, H., et al., 2024. Three⁃ Dimensional Mineral Prospectivity Modeling with Geometric Restoration: Application to the Jinchuan Ni⁃Cu⁃(PGE) Sulfide Deposit, Northwestern China. Natural Resources Research, 33(1): 75-105. https://doi.org/10.1007/s11053⁃023⁃10269⁃2 |
| [27] |
Mao, Y.J., Barnes,S.J., Duan,J., et al., 2018. Morphology and Particle Size Distribution of Olivines and Sulphides in the Jinchuan Ni⁃Cu Sulphide Deposit: Evidence for Sulphide Percolation in a Crystal Mush. Journal of Petrology, 59(9):1701-1730. https://doi.org/10.1093/petrology/egy077 |
| [28] |
Palme, H., O’Neill, H. St. C., 2007. Cosmochemical Estimates of Mantle Composition. In: Holland, H. D., Turekian, K. K., eds., Treatise on Geochemistry. Elsevier, Amsterdam. https://doi.org/10.1016/b0⁃08⁃043751⁃6/02177⁃0 |
| [29] |
Peach, C. L., Mathez, E. A., Keays, R. R., 1990. Sulfide Melt⁃Silicate Melt Distribution Coefficients for Noble Metals and Other Chalcophile Elements as Deduced from MORB: Implications for Partial Melting. Geochimica et Cosmochimica Acta, 54(12): 3379-3389. https://doi.org/10.1016/0016⁃7037(90)90292⁃S |
| [30] |
SGU (The Sixth Geological Unit of the Geological Survey of Gansu Province),1984. Geology of the Baijiazuizi Cu⁃Ni Sulfide Deposit. Geological Publishing House, Beijing (in Chinese). |
| [31] |
Song, X. Y., Danyushevsky, L. V., Keays, R. R., et al., 2012. Structural, Lithological, and Geochemical Constraints on the Dynamic Magma Plumbing System of the Jinchuan Ni⁃Cu Sulfide Deposit, NW China. Mineralium Deposita, 47(3): 277-297. https://doi.org/10.1007/s00126⁃011⁃0370⁃7 |
| [32] |
Song, X. Y., Kang, J., Long, T. M., et al., 2023. Bifurcate Magma Conduit of Jinchuan Super⁃Large Ni⁃Cu⁃PGE Sulfide Deposit in Gansu, China and Its Implications for Deep Ore Prospecting. Journal of Earth Sciences and Environment, 45(5): 1049-1062 (in Chinese with English abstract). |
| [33] |
Song, X. Y., Keays, R. R., Zhou, M. F., et al., 2009. Siderophile and Chalcophile Elemental Constraints on the Origin of the Jinchuan Ni⁃Cu⁃(PGE) Sulfide Deposit, NW China. Geochimica et Cosmochimica Acta, 73(2): 404-424. https://doi.org/10.1016/j.gca.2008.10.029 |
| [34] |
Sun, X., Liu, C. H., Duan, R. H., 2024. The Age and Geological Significance of Early Neoproterozoic Mafic Sills on the Eastern Margin of the North China Craton: Evidence from Zirconology. Earth Science, 49(9): 3122-3139 (in Chinese with English abstract). |
| [35] |
Tang, Z.L., Li, W.Y., 1995. The Metallogenetic Model and Geological Characteristics of the Jinchuan Pt⁃Bearing Ni⁃Cu Sulfide Deposit. Geological Publishing House, Beijing (in Chinese) |
| [36] |
Wan, Y. S., Dong, C. Y., Xie, H. Q., et al., 2024. Formation and Evolution of Archean Continental Crust in the Anshan⁃Benxi Area, North China Craton: A Review. Earth Science, 49(11): 3855-3878 (in Chinese with English abstract). |
| [37] |
Xue, S. C., Wang, Q. F., Wang, Y. L., et al., 2023. The Roles of Various Types of Crustal Contamination in the Genesis of the Jinchuan Magmatic Ni⁃Cu⁃PGE Deposit: New Mineralogical and C⁃S⁃Sr⁃Nd Isotope Constraints. Economic Geology, 118(8): 1795-1812. https://doi.org/10.5382/econgeo.5017 |
| [38] |
Yang, X. Z., Ishihara, S., Zhao, D. H., 2006. Genesis of the Jinchuan PGE Deposit, China: Evidence from Fluid Inclusions, Mineralogy and Geochemistry of Precious Elements. Mineralogy and Petrology, 86(1): 109-128. https://doi.org/10.1007/s00710⁃005⁃0094⁃4 |
| [39] |
Zhang, M.J., Kamo, S.L., Li, C. et al. 2010. Precise U⁃Pb Zircon⁃Baddeleyite Age of the Jinchuan Sulfide Ore⁃Bearing Ultramafic Intrusion, Western China. Mineralium Deposita, 45: 3-9. https://doi.org/10.1007/s00126⁃009⁃0259⁃x |
地球深部探测与矿产资源勘查国家科技重大专项(2025ZD1007106)
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