Zircon LA-ICP-MS U-Pb dating from the Huanggangliang granite exhibits a tight cluster on the Concordia plot and yields a weighted mean 206Pb/238U age of 139.96 卤 0.87 Ma, which is considered to be the best estimate of the crystallization age of the Huanggangliang granite. Results obtained from the molybdenite Re-Os isotopic analysis indicate Re-Os model ages of 133.6 to 141.5 Ma and a weighted mean age of 135.1 卤 2.3 Ma. The molybdenite Re-Os dating yields an isochron age of 134.9 卤 5.2 Ma and an initial 187Os/188Os ratio of 鈭?#xA0;0.22 卤 0.35. The molybdenite Re-Os isochron age is largely consistent with the zircon U-Pb age, indicating that both granite intrusion and Fe-Sn mineralization were associated with the Mesozoic magmatism in NE China.
Based on ore deposit geology, isotope geochemistry and geochronology of the Huanggangliang Fe-Sn deposit and regional geodynamic evolution, the formation of this deposit is believed to be related to lithospheric thinning, which was caused by delamination and subsequent upwelling of the asthenosphere under the intra-continental extension in NE China. The dynamic setting for the geological processes should be linked to the NNW subduction of the Izanagi plate beneath the Eurasian plate during the Mesozoic. This subduction triggered intensive magmatism and mineralization events in the Great Hinggan Range of NE China, making this district an important Cu-Mo-Sn-Fe-Ag-Pb-Zn metallogenic province.