Mesozoic multiple magmatism and porphyry–skarn Cu–polymetallic systems of the Yidun Terrane, Eastern Tethys: Implications for subduction- and transtension-related metallogeny

Importance of Magmatic Water Content and Oxidation State for Porphyry-Style Au Mineralization: An Example from the Giant Beiya Au Deposit, SW China

“…The Sanjiang (Nujiang-Lancangjiang-Jinshajiang) region is an important part of the Tethys tectonic domain, located in Southwestern China [25,26]. The Jinshajiang-Ailaoshan suture zone is located in the eastern Himalaya-Tibetan plateau of the Tethyan domain and is bounded by the western Yangtze Craton to the southeast (Figure 1).…”

Geochronology, mineralogy, and geochemistry of the Late Triassic Xiuwacu biotite granite in the southern Yidun Terrane, southwest China: Insights into the petrogenesis and magmatic fertility

“…217 Ma, which is nearly synchronous with the abundant ~220‐ to 215‐Ma arc‐related adakitic rocks (i.e., andesite, diorite porphyry, and monzonite porphyry) occurred in the southern Yidun Terrane (SYT). These slab melt‐derived adakitic rocks exhibit steep REE patterns, high Sr/Y ratios, and significant Nb–Ta anomalies and are genetically related to the extensive porphyry Cu mineralization in the SYT (Li et al, ; Wang, Zhou, Li, & Yan, ; Yang et al, ). Nevertheless, the Xiuwacu biotite granites have low Sr/Y ratios (6.6–37.6) and high Y contents (14.9–19.7 ppm), inconsistent with the geochemical signatures of adakitic granitoids but similar to normal arc magmatic rocks (Figure f).…”

“…Due to the development of diverse tectonic settings, granitoid affinities, and mineralization styles, the eastern Yidun Terrane has been divided into the northern and southern subterranes (Gao, Yang, & Orovan, ; Gao, Yang, Zhang, et al, ; Yang et al, ; Yang et al, ; Yang, Deng, et al, ; Yang, Gao, & Shu, ). Voluminous Late Triassic granite, granodiorite, and monzogranite intruded Middle to Late Triassic volcano‐sedimentary sequences across the Yidun Terrane (Figure b).…”

“…The southern Yidun Terrane hosts one of the most important Mesozoic porphyry Cu–Mo polymetallic systems in the Sanjiang Tethys metallogenic domain (Deng & Wang, ; Deng, Wang, & Li, ; Deng, Wang, Li, Li, & Wang, ). It is well known for the breakthrough of two‐episode porphyry‐related mineralization, including a series of Late Triassic porphyry–skarn Cu‐polymetallic mineralization associated with arc‐related magmatism (e.g., Pulang porphyry Cu–Mo, Xuejiping porphyry Cu, and Langdu skarn Cu–Fe deposits; Li, Yu, Gao, Liu, & Wang, ; Yang, Gao, & Shu, ; Yang, He, Gao, Xie, & Yang, ) and several Late Cretaceous magmatic‐hydrothermal deposits genetically related to the intraplate magmatism, such as the Xiuwacu quartz vein‐type Mo–W, Relin porphyry Cu–Mo, Hongshan porphyry–skarn Cu–Mo, and Tongchanggou porphyry–skarn Mo–Cu deposits (Gao, Yang, & Orovan, ; Gao, Yang, Meng, & Zhang, ; Gao, Yang, Zhang, & Meng, ; Yang, Deng, et al, ). Notably, the Late Triassic granitoids with arc magma affinities also occurred in the Late Cretaceous Xiuwacu deposit (biotite granite; Gao, Yang, & Orovan, ; Zhang, Li, Yin, Yang, & Tang, ).…”

Editorial for Special Issue “Polymetallic Metallogenic System”

“…The metallogenic system model allows for multiple mineralization styles to be identified within a single system [5]. For example, a porphyry copper system may develop associated high and low sulfidation epithermal gold mineralization, and skarn-type or hydrothermal vein-type Cu-Pb-Zn-Ag mineralization [6][7][8]. By integrating all geological ingredients and processes that are necessary for the formation of mineral deposits, the investigation of the metallogenic system is more useful for revealing the geodynamic evolution of a region, and more effective for regional prospecting exploration [9][10][11] From the perspective of regional metallogeny, the study by Niu et al [12] relates deep dynamic processes in the Earth to gold deposits at the crustal surface (core → mantle → crust) in Jiaodong Province.…”