郴临深大断裂带及其两侧的岩浆岩特征

THE CHARACTERISTICS OF MAGMATIC ROCKS ALONG THE CHENZHOU-LINWU DEEP-SEATED FAULT

主要根据花岗岩W、Sn、Bi、Mo、Cu、Pb、Zn含量高于华南同期花岗岩的平均值、其侵入活动延续时间长、元素地球化学分异强烈、云母长石等造岩矿物富含成矿元素且易蚀变释放 ,认为区内岩浆岩极利于成矿 ;根据岩浆岩在岩石化学、稀土元素特征值和标准化模式、87Sr/ 86 Sr初始值等均以郴临构造岩浆岩带为界 ,其东西两侧差异明显 ,两者与郴临构造岩浆岩带虽有差异 ,但都存在渐变性 ,提出这些岩浆岩主要是同源演化的产物。

Mainly based on granites along the Chenzhou Linwu deep seated fault zone have higher contents of W, Sn, Bi, Mo, Cu, Pb and Zn than those of the average value of South China granite of the same period and magmatism along the zone has a long duration with strong element geochemiic differentiation as well as enrichment of ore-forming elements contained in and easily being discharged by alteration from the mineral, such as mica, feldspar etc.,consequently it is considered that the granite in this area is favorable for mineralization. Although the difference between the intrusions across the Chenzhou Linwu tectonomagmatic zone is obvious according to petrochemistry, REE characteristics and 87 Sr/ 86 Sr initial value etc., the authors considered that the magmatic rocks in the studied area might have been evolved from the magma derived from the same source area.