Abstract
The Hutouya polymetallic skarn deposit lies in the Qimantagh area of the East Kunlun Orogenic Belt, NW China. Skarnization and mineralization at the deposit are closely associated with contemporary felsic intrusions. In this paper, zircon U-Pb ages and zircon Hf isotope as well as whole-rock geochemical and whole-rock Sr-Nd isotope data are reported for intrusive rocks and crystal tuff of the Elashan Formation in the Hutouya area. Moreover, Re-Os ages and S-Pb isotopes are also reported for the ore minerals in the Hutouya deposit. The Zircon laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) U-Pb age of granodiorite and Re-Os isochron age of molybdenite suggest that mineralizations occurred at ca. 227 Ma and that the granodiorite and molybdenite are closely related petrogenetically. All the granitoids in the Hutouya deposit are high-K calc-alkaline and metaluminous to weakly peraluminous I-type granitoids. Among them, the ore-forming granitoids were derived by the mixing of crust-derived (either juvenile or ancient mature lower crust) and mantle-derived magmas, whereas the non-ore-related granite porphyry was generated by the partial melting of a single ancient mature lower crust. The magmas of all the granitoids underwent extensive fractionation–crystallization during the process of rising and emplacement. The sulfur of the analyzed samples from the northern and middle zone of Hutouya deposit (including No. II, III, IV, and VI ore belts) belongs to deep magmatic sulfur, while the sulfur of samples from the southern zone of Hutouya deposit (No. VII ore belt) includes not only deep magmatic sulfur but also a contribution of strata sulfur. All the ore mineral samples in the Hutouya deposit have similar Pb compositions that are consistently derived from a mixed source of upper crust and mantle. Tectonic discrimination diagrams indicate a post-collisional setting for all granitic rocks of the Hutouya skarn deposit, which is therefore considered a product of a the post-collision extensional system and is consistent with other porphyry-skarn deposits within the East Kunlun Orogenic Belt.
Highlights
The East Kunlun Orogenic Belt (EKOB; Figure 1a,b) is one of the most significant polymetallic belts in China [1], with many studies of its numerous porphyry- and skarn-type deposits having been undertaken in recent years (Table 1)
In order to address the above issues, we provide new geochronological and geochemical data for the Hutouya deposit, including molybdenite Re-Os dating, zircon LA–ICP–MS
Re-Os dating dating reveals reveals that that the the emplacement emplacement of of granitoids and mineralization of the Hutouya deposit occurred at ca
Summary
The East Kunlun Orogenic Belt (EKOB; Figure 1a,b) is one of the most significant polymetallic belts in China [1], with many studies of its numerous porphyry- and skarn-type deposits having been undertaken in recent years (Table 1). The sulfur of all the analyzed samples from the northern and middle zone of the Hutouya deposit (including oregeodynamic belts Nos. II, background III, IV, and VI). The EKOB records several different orogenic phases and VII) was derived from deepinmagmatic andrelated the contribution of strata sulfur. According to data in our study, the Late Triassic granitic rocks and crystal tuff from the Hutouya deposit are calc-alkaline I-type granites. In Nb-Y, and Rb–(Yb + Ta) diagrams (Figure 14), most samples
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