华南燕山期两种不同矿化花岗岩类中锆石标型特征的研究

华南地区燕山期两种不同矿化花岗岩类中锆石的标型特征有较明显区别。第一类花岗岩锆石的比重、硬度、红外光谱频率均低于第二类花岗岩锆石,而晶胞常数正相反,第一类花岗岩锆石较富含W、sn、Be、Nb、U、Th REE,第二类则富含Cu、Pb;第一类花岗岩锆石表面微结构特征有熔蚀坑、裂纹呈网状、附生物形态不定,第二类则表面无熔蚀坑,裂纹和附生物均较规则等。本中探讨了锆石标型特征控制因素和形成规律。为锆石及母岩的成因物质来源、成岩成矿提供矿物学标志和信息。

STUDY ON THE TYPOMORPHIC CHARACTERISTICS OF ZIRCON FROM TWO DIFFERENT TYPES OF MINERALIZED GRANITOIDS OF YANSHAN OROGENY IN SOUTH CHINA

This paper deals in details with zircon mineralogy of two different types of mineralized granitoids (REE, RE tungstentin mineralized granitoid and copper, polymetal mineralized granitoid from eight rock masses with 30 artificial heavy concentrate samples in total) including physical properties of minerals, x-ray powder analysis,chemical analysis, infrared spectrometry and ESM etc. First,the geological occurrence and paragenious minerals of zircon in granitoids of two types of mineralization are discussed. Then the typomorphic characteristics of zircon from two different types of mineralized granitoids of Yanshang orogeny in South China are summed up on the basis of systematic sorting out and all-sided analysis of numerous test data. The results of investigatiions show that the zircon typomorphic characteristics of the above-mentioned two types of mineralized granitoids remarkably differ from each other. The significance of the two types of zircon typomorphic characteristics is emphasized in this paper. Furthermore, the controlling factors and formation mechanism of the zircon typomorphic characteristics are discussed. On this basis, some ore-prospecsing criteria in the diversed mineralized granitoids of Yanshang orogeny in South China are pointed out.