Abstract
The Gayahedonggou magmatic Cu-Ni sulfide deposit was recently discovered in the East Kunlun orogenic belt (Northern Tibetan Plateau, China). The mineralization in this region is associated with mafic–ultramafic intrusions. To date, the formation age and metallogenic model of these ore-bearing intrusions have not been studied systematically. In this paper, the petrology, zircon U-Pb chronology, and geochemistry of ore-bearing wehrlite and quartz diorite are investigated. The results show that the zircon U-Pb isotopic age of wehrlite is 419.9 ± 1.5 Ma with an average εHf(t) value of 3.0, indicating that wehrlite originated from a depleted mantle or the asthenosphere. The (La/Yb)N, (La/Sm)N, (Gd/Yb)N, Nb/U, and Ce/Pb ratios of wehrlite are between 3.01–7.14, 1.69–3.91, 1.36–1.51, 2.07–2.93, and 0.55–1.42, respectively, indicating that the parent magma of the wehrlite had been contaminated by the upper crust. The zircon U-Pb isotopic age of quartz diorite is 410.2 ± 3.5 Ma with an average εHf(t) value of 8.0, and the A/CNK and A/NK ratio of quartz diorites ranges from 1.02 to 1.04 and from 2.13 to 2.23, respectively. These features are similar to those of the type I granite, and the quartz diorite was likely derived from the lower crust. Combined with the regional geological evolution, the Gayahedonggou complex formed in a post-collision extensional environment. The pyroxene in the Gayahedonggou complex is mainly clinopyroxene, which is enriched in the CaO content, indicating that the CaO content of the parent magma of the Gayahedonggou complex is high or that the complex has been contaminated by Ca-rich surrounding rocks, which hinders Cu-Ni mineralization.
Highlights
Magmatic Cu-Ni sulfide deposits are an important source of copper and nickel metal. most of the world’s large magmatic Cu-Ni sulfide deposits are known to have formed in large igneous provinces [1,2,3], those that occur in orogenic environments have considerable metallogenic potential [4,5,6,7,8,9,10,11,12,13]
Cu-Ni oreCu-Ni bodies occur in small ultramafic intrusions, and theand formation age is between million tons
The Paleo-Tethys evolved between the late Paleozoic and Mesozoic eras, and voluminous activity associated with the subducted oceanic eras, and voluminous magmaticmagmatic activity associated with the subducted oceanic crustcrust hashas been been recorded
Summary
Magmatic Cu-Ni sulfide deposits are an important source of copper and nickel metal. most of the world’s large magmatic Cu-Ni sulfide deposits are known to have formed in large igneous provinces [1,2,3], those that occur in orogenic environments have considerable metallogenic potential [4,5,6,7,8,9,10,11,12,13]. In the last 10 years, some magmatic Cu-Ni sulfide deposits (such as Xiarihamu, Shitoukengde, Akechukesai, and Binggounan) that formed in orogenic environments have been discovered, and the associated Ni resources reached a total of 1.2 million. The other view is that the environment was post-collision Given these different perspectives, case studies metallogenic environment was[4,5,14,15]. Preliminary geological studies suggest that the formation of the deposit is related to Bureau in 2018. Preliminary geological studies suggest that the formation of the deposit is related ultramafic intrusions at the end of the Early Paleozoic. U-Pb isotopic ages of from the magmatic intrusions and the petrochemical deposit. U-Pb isotopic ages of the magmatic intrusions and the petrochemical characteristics characteristics of rocks were investigated, and zircon Lu-Hf isotopic determinations were of performed. The results results provide new Lu-Hf evidence for thedeterminations metallogenic model of the Cu-Ni sulfide provide new deposits in evidence the EKOB.for the metallogenic model of the Cu-Ni sulfide deposits in the EKOB
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