南岭花岗岩熔化实验的初步研究

本文根据南岭代表性广泛的加里东期石英闪长岩、海西期堇青石黑云母花岗岩、燕山早期黑云母花岗岩和燕山晚期锂云母钠长石花岗岩以及板溪群石英云母片岩、建欧群石英长石云母片岩等的熔化实验与部分人工合成花岗岩结晶实验研究结果,讨论了南岭区花岗岩的成因.基于四种花岗岩初熔温度分别为:720°,710°,680°,576℃及后三种花岗岩包果体测温分别为:650°,675°—680°,512°—530℃,结合大量地质资料,初步认为,花岗岩主要是岩浆形成,而非花岗岩化(交代)成因。     

南岭花岗岩液态分离实验研究

用黑云母花岗岩加10％NaF和10％LiF作为初始物,在1000bar,840℃条件下实验产生了不混溶,均一的富氟锂花岗岩熔体分离成两种以上的熔体相。据电子探针分析结果至少可分出:一种是富氟铁的硅酸盐熔体,另一种是贫氟的硅酸盐熔体,第三种是氟盐类为主的熔体,结合南岭花岗岩的某些特征进行了讨论,用实验结果,有可能对花岗岩中一些难以解释的球粒结构,矿物中玻璃包体、矿化囊包体、流动构造等地质现象,给予解释。     

AN EXPERIMENTAL STUDY ON LIQUID SEGREGATION OF NANLING GRANITES

Based on the characteristics of granites of the Nanling region, a procedure was specially designed to do experiment on the immiscible liquid phase. The starting materials were biotite granite + NnF + LiF. Under 1000 bar and 840℃, more than two immiscible liquid phases were produced from the homogeneous granite melt rich in F and Li. Electron microprobe data suggest that the immiscible liquid phases can be divided into (ⅰ) a silicate melt rich in F and Fe (melanocratic glass balls), (ⅱ) a silicate melt poor in F (matrix glass), and (ⅲ) a melt consisting mainly of fluorates (leucocratic glass balls). In conjunction with the chemical and mineral compositions, the structure and texture of granites in the Nanling region, the experimental results are discussed in this paper. The theory of liquid immiscibility can well account for the globular structure, glass inclusions pressent in minerals mineralized globular "inclusions", flow structure, banded structure and layer structure as are observed in Nanling g