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Economic Geology; January-February 2007; v. 102; no. 1; p. 75-94; DOI: 10.2113/gsecongeo.102.1.75
© 2007 Society of Economic Geologists
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Field Relationships and Geochemical Constraints on the Emplacement of the Jinchuan Intrusion and its Ni-Cu-PGE Sulfide Deposit, Gansu, China

Jérémie Lehmann and Nicholas Arndt{dagger}

Laboratoire de Geodynamique des Chaînes Alpines, Université de Grenoble 1, 1381 rue de la Piscine, 38400 St. Martin d’Hères, France

Brian Windley

Department of Geology, University of Leicester, Leicester LE1 7RH, United Kingdom

Mei-Fu Zhou and Christina Yan Wang

Department of Earth Sciences, University of Hong Kong, Hong Kong, People’s Republic of China

Chris Harris

Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa

{dagger} Corresponding author: e-mail, arndt{at}ujf-grenoble.fr

Field mapping and petrological-geochemical investigation of the Jinchuan intrusion in north-central China clarifies how the intrusion was emplaced and provides a new model that explains how its large and rich Ni-Cu-platinoid deposits may have formed. The intrusion was emplaced into high-grade gneisses and marbles along a disconformity at the base of an overlying cover sequence, indicating that it was emplaced as a sill, not a near-vertical dike, as previously proposed. After emplacement the intrusion was rotated to its present orientation and deformed and metamorphosed under greenschist-facies conditions. Relative enrichment of incompatible trace elements coupled with negative U-Th and Nb-Ta anomalies in all samples from the intrusion provide evidence that the parental magma assimilated granitoid rocks in the lower crust. The presence of abundant marble xenoliths, now decarbonatized to diopside-rich skarns, and chemical indices such as high CaO/SiO2, indicate that the magma assimilated carbonate on reaching its present site. This contamination may be linked to the formation of the Ni-Cu platinoid ores. We propose that the assimilation of carbonate-rich fluids increased the oxygen fugacity of the magma and led to the segregation of metal-rich sulfides.




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Z. Seat, S. W. Beresford, B. A. Grguric, M. A. M. Gee, and N. V. Grassineau
Reevaluation of the Role of External Sulfur Addition in the Genesis of Ni-Cu-PGE Deposits: Evidence from the Nebo-Babel Ni-Cu-PGE Deposit, West Musgrave, Western Australia
Economic Geology, July 1, 2009; 104(4): 521 - 538.
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Z. Zhang, J. Mao, F. Chai, S. Yan, B. Chen, and F. Pirajno
Geochemistry of the Permian Kalatongke Mafic Intrusions, Northern Xinjiang, Northwest China: Implications for the Genesis of Magmatic Ni-Cu Sulfide Deposits
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