Age, Genesis and Tectonic Setting of the Sayashk Tin Deposit in the East Junggar Region: Constraints from Lu–Hf Isotopes, Zircon U–Pb and Molybdenite Re–Os Dating

The Sayashk tin (Sn) deposit is located within the southern part of Eastern Junggar orogenic belt in Xinjiang Province and forms Kalamaili alkaline granite belt. There are many Sn polymetallic deposits area. To constrain age, genesis, tectonic setting East region, we conducted a bulk-rock geochemical analysis porphyry (SR1) medium- to fine-grained (SR2) hosts deposit, LA-ICP-MS zircon U–Pb dating Lu–Hf isotopic analysis, as well molybdenite Re–OS combined our results with metallogenic conditions other geological characteristics deposit. show that indeed spatially, temporally, genetically closely related medium-fine-grained granite. Both ages 308.2 ± 1.5 Ma 310.9 Ma, respectively. isochron age 301.4 6.7 which represents crystallization Therefore, all them formed late Carboniferous epoch. granites characteristically rich Si alkali, poor Ca Mg, high field-strength elements (HFSE, e.g., Zr, Hf) Ce, deficient Ba, Sr, Eu, P, Ti. They typical A-type granites, showing mixed crustal mantle source. ?Hf(t) values from range 10.27 16.17 (average 13.71), between 5.72 9.21 7.08), single model (TDM1) two-stage (TDM2) fall ranges 319~535 339~644 Ma. 346~479 309~557 little difference their ages, indicating may be product partial melting juvenile crustal. Combined previous research results, post-collision extensional after