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通过电子探针和激光拉曼光谱分析技术系统研究了阿尔泰可可托海3号伟晶岩中蜕晶质化锆石各部位的成分特征、结构变化和蜕晶质化程度间的关系,定量评测了放射性衰变对锆石不同部位结构的影响程度。成分分析结果表明此锆石为铪质锆石,具有明显的环带,其中核部U、Th含量高,边部U、Th含量低,而且锆石破碎区富含非化学式元素Ca、Al、P等,表明此处为锆石的薄弱区,已发生热液蚀变。拉曼光谱特征和锆石的辐射剂量值都表明,锆石核部发生了中度-高度的蜕晶质化,且由于热事件发生退火,辐照损伤程度得到一定的愈合;而边部晶体结构保持较好,只局部出现点缺陷和零星非晶质区。
Through electron probe and laser Raman spectroscopy, we systematically studied the relationship between the composition, the structure and the degree of decrystallization of the decrystallized zircons in the Kekeituo 3 pegmatite, Altai, The degree of influence of radioactive decay on the structure of different parts of zircon. The compositional analysis shows that the zircon is a hafnium zircon with obvious zoning, in which the core U, Th content is high, the edge U, Th content is low, and the zircon crushing zone is rich in non-chemical elements Ca, Al, P, etc., indicating that here is a weak area of zircon, hydrothermal alteration has taken place. The Raman spectra and the zircon radiation dose values indicate that the zircon nuclei undergo moderate-high de-crystallization and that the degree of irradiation damage is somewhat healed due to the annealing of thermal events. The structure is well maintained, with only spot defects and sporadic amorphous regions.