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为了精确厘定锡山钨锡矿床成岩成矿时代,本文分别对锡山岩体斑状二长花岗岩和矿体开展了锆石LA-ICP-MS U-Pb和石英Rb-Sr年代学研究,获得的锆石U-Pb年龄为103±3Ma,石英矿物Rb-Sr等时线年龄为94±12Ma,两者在测定误差内一致,表明锡山岩体晚阶段形成的花岗岩在时间和空间上与成矿作用有明显的耦合关系,其成岩成矿作用发生在早白垩世晚期。锡山成岩成矿的动力学背景应与早白垩世晚期南岭地区的岩石圈伸展拉张引发的大规模岩浆活动有关。
In order to determine accurately the age of diagenesis and mineralization of the Xishan Tungsten-tin deposit, zircon zircon LA-ICP-MS U-Pb and quartz Rb-Sr chronological studies were carried out on the porphyritic monzogranites and ore bodies, respectively. The zircons The U-Pb age is 103 ± 3Ma, and the Rb-Sr isochron age of quartz mineral is 94 ± 12Ma. Both of them are consistent within the measurement error, indicating that the granite formed in the late stage of Xishan pluton has the temporal and spatial mineralization with Significant coupling relationship, the diagenesis and mineralization occurred in the late Early Cretaceous. The dynamic background of the Xishan diagenetic mineralization should be related to the large-scale magmatic activity triggered by the extensional extension of the lithosphere in the Nanling area in the early stage of Early Cretaceous.