Key factors controlling the late Mesozoic diverse porphyry Mo, Cu, and Au mineralization in the Qinling Orogenic Belt, Central China

作者：Li Tang, Rui Wang, M. Santosh, Guiqing Xie, Qihai Shu, Huawen Cao, Longlong Chen, Fengyun Zhao, Shouting Zhang · 发表于：Geological Society of America Bulletin · 年份：2025 · DOI：10.1130/b37779.1 · 被引用次数：7 · 研究领域：Geochemistry and Geologic Mapping、Geochemistry and Geochronology of Asian Mineral Deposits、Geological and Geochemical Analysis

Abstract The Qinling Orogenic Belt of Central China hosts one of the world-class porphyry Mo belts (proven Mo resource of 8.43 Mt), several porphyry-skarn Cu and Au deposits, and abundant coeval barren granitoid intrusions. The mineralized porphyry systems of the Late Jurassic to Early Cretaceous periods are the major contributors to the metal resources that are distributed in the eastern segment of the Qinling Orogenic Belt. The key factors controlling the fertility and diversity of the porphyry are not well understood, such as the magma source, magmatic water content, magma oxidation state, sulfur and halogen values, and the nature of the magma chamber, among other aspects. The fertile porphyries of Mo and Au deposits are characterized by enriched Sr-Nd-Hf isotopes, relatively low δ18O values of 4.58‰–8.65‰, abundant inherited zircons from the Neoarchean to Paleozoic periods in age, and high apatite MnO contents. These conditions indicate mixed magma sources from partial melting of the Neoarchean to Paleoproterozoic lower crust, subducted continental crust of the Yangtze Block, and the metasomatized lithospheric mantle. The Cu (-Mo) ore-forming porphyries have depleted isotopic features and a distinct magma source derived from partial melting of the Triassic juvenile lower crust with significant contributions of mantle-derived mafic magma. Lithospheric architecture and magma source are considered to be the primary controlling factors for the diverse Cu (-Mo), Mo (-W), and A...