Geochronology and geochemistry of the Shanagen hydrothermal vein-type Mo deposit in Derbugan metallogenic belt of the NE China and their geological significance

• DOI: 10.3389/feart.2022.971738
• Publication Date: 2023-01-16T04:18:51Z
• Authors: Yunxia Wu; Yu Liu; Aoran Liu; Lifu Tian; Yasheng Ye
• Keywords: Molybdenite; Geochronology; Rare-earth element; Alkali feldspar

The Shanagen hydrothermal vein-type Mo deposit belongs to the Derbugan metallogenic belt, which is located in Ergun block, NE China. mineralization mainly developed sericitized quartz siltstone around alkali-feldspar granite. In this paper, we present Molybdenite Re–Os dating, zircon U–Pb dating and geochemical data with aim of determining epoch tectonic setting. granite indicate that ore-formation emplacement occurred at 143.1 ± 3.8 Ma, 144.7 0.7 Ma. Both were formed early Cretaceous. Chemically, granites are enriched L rare earth element LILEs, depleted H HFSEs, pronounced negative Eu anomalies, metaluminous belong high-K calc-alkaline series highly differentiated I-type Geochemical features concave upwards pattern imply from magma generated by partial melting lower crust. Combining geochemistry, chronology, regional evolution, infer was extensional environment after closure Mongol-Okhotsk Ocean.