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成矿年代学是矿床学研究的重要内容,精确的成矿年龄对于理解矿床成因、矿化过程及指导找矿具有十分重要的意义。目前对锡矿床形成年龄的厘定,主要借助与锡石伴生矿物的同位素定年来间接约束(如白云母40Ar-39Ar、辉钼矿Re-Os法等)。在一些矿床中,这些伴生矿物并非与锡石同时形成,且部分矿物的同位素体系封闭温度较低,容易受后期构造热事件的叠加或扰动。锡石是锡矿床主要的矿石矿物,属于四方晶系中的金红族类,晶格中常常含有较高含量的U,晶体结构较为稳定,U-Pb同
Metallogenic chronology is an important part of mineral deposit research. Precise metallogenic age is of great significance for the understanding of genesis, mineralization and ore prospecting. At present, the formation age of the tin deposit is determined mainly by the isotopic dating of cassiterite-associated minerals (eg, 40Ar-39Ar of muscovite, Re-Os method of molybdenite, etc.). In some deposits, these accompanying minerals are not formed simultaneously with cassiterite, and the isotopic compositions of some minerals have relatively low sealing temperatures and are susceptible to superimposition or perturbation of later tectonic thermal events. Cassiterite is the main ore mineral of the tin deposit and belongs to the gold red family in the tetragonal crystal system. The crystal lattice often contains a high content of U, the crystal structure is relatively stable, and the U-Pb