Magmatic hydrothermal origin of the Hadamengou-Liubagou Au-Mo deposit, Inner Mongolia, China: Constrains on geology, stable and Re-Os isotopes

Genesis of the Xishadegai Mo deposit in Inner Mongolia, North China: Constraints from geology, geochronology, fluid inclusion, and isotopic compositions

“…As a typical Triassic deposit in the northern margin of the NCC, the Xishadegai Mo deposit formed almost simultaneously with the Hadamengou–Liubagou Au deposit in the study area under a postcollisional setting (Zhang, Gu, Xiang, et al, ). The ore veins are structurally controlled, and temporally and spatially associated with contemporaneous granitic intrusions representing an important magmatic and mineralization event during the Triassic in the CAOB.…”

“…The results obtained in this study and those from previous studies on the major magmatic hydrothermal Mo‐(Cu/Au) deposits and related intrusions of the CAOB, including Re‐Os and U–Pb age data representing timing of mineralization and magmatism, are compiled in Figure . Phanerozoic Mo deposits generally formed in five periods: Late Cambrian to Early Ordovician, Late Devonian to Early Carboniferous, Middle to Late Permian, Triassic, and Jurassic to Early Cretaceous (Figure b; Chen, Cheng, Li, & Yang, ; Chen, Zhang, et al, ; Zeng et al, , ; Zhang et al, , ). They are intimately related to multiple magmatic episodes during the evolution and to the interaction of the Siberian, NCC, Paleo‐Asian Ocean, Paleo‐Pacific Ocean, Mongol‐Okhotsk Ocean, and Pacific Ocean from the Late Cambrian to the Cretaceous (Groves et al, ; Hao et al, ; Seltmann & Porter, ; Seltmann, Porter, & Pirajno, ; Wang, Xu, Meng, Cao, & Gao, ; Zeng et al, ; Zhang, Gu, Liu, et al, ).…”

“…(a) The distribution of major magmatic hydrothermal Mo‐(Cu/Au) deposits in the Central Asian Orogenic Belt (modified after Yakubchuk, ; Seltmann et al, ; Chen et al, ); (b) ages and tectonic setting for Mo mineralization and ore‐related rocks. The data are summarized from Chen et al (, ); Zeng et al (, ); and Zhang et al (, ). (c) Schematic presentation of a possible genetic model for molybdenum mineralization in the Xishadegai area [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…The Mo mineralization is not as widely developed as Cu and Au during Palaeozoic in the CAOB (Figure a,b). The magmatic–hydrothermal deposits and related magmas mainly formed under island‐arc setting during Late Cambrian to Early Ordovician and Late Devonian to Early Carboniferous (Chen, Zhang, et al, ; Seltmann et al, ; Zhang et al, ), as exemplified by Duobaoshan, Tongshan, Lailisigaoer, Yuhai, Tuwu‐Yandong, and Hadamengou Cu–Mo and Mo deposits (Gu et al, ; Liu, Wu, Li, Zhu, & Zhong, ; Liu, Zhou, He, & Ouyang, ; Wang, Zhang, & Liu, ; Zhang, Gu, Xiang, et al, ). Permian Mo deposits, represented by the Halibao Cu–Mo and Liushashan Au–Mo deposits, are interpreted to have originated from the final southward subduction of the Paleo‐Asian Ocean (Chen, Zhang, et al, ).…”

“…During Devonian to Early Carboniferous, southward subduction of the Paleo‐Asian Ocean beneath the NCC (Xiao, Windley, & Hao, ; Zhang & Zhai, ) had triggered the formation of the Dahuabei Batholith in the study area, resulting in the early Mo mineralization at Hadamengou–Liubaogou Au deposit (Zhang, Gu, Xiang, et al, ). The Paleo‐Asian Ocean subducted until the Permian and was finally consumed between the Siberian and NCC in the Late Permian along the Suolunshan–Xar Moron river–Changchun–Yanji belt (Cao et al, ; Chen et al, ; Li, ; Shi, ; Wang et al, ; Wang & Fan, ; Wang & Guo, ; Windley et al, ; Xiao et al, ).…”