【摘要】 对张八岭地区管店附近含角闪石片岩的岩相学、矿物成分分析和p-T条件的初步估计表明,该地区片岩中的角闪石为钠质闪石类的镁钠闪石,其中氧化物平均含量Al2O3=3.97%,Fe2O3=20.57%,相应的Al3+,IV=0.54,Fe3+=1.34,指示的变质温压条件为t=500~600℃,p≤0.3 GPa,显示了低压变质相系的特征。结合前人对张八岭地区的“蓝闪石”的研究资料,并对比作者等对天山昭苏、库车地区和西藏羌塘地区的蓝闪石分析数据,认为张八岭地区并没有真正意义上的蓝闪石存在,张八岭群中“蓝片岩”是否存在以及是否经历低温高压变质作用需要进一步的详细研究。更多还原

【Abstract】 On the basis of the petrology,mineral chemistry and p-t conditions of the amphibole-bearing schists across Guandian,Zhangbaling,amphiboles in this schist belong to magnesioriebeckite,the average oxide contents: Al2O3=3.97%,Fe2O3=20.57%,Al3+,Ⅳ=0.54,Fe3+=1.34,and these magnesioriebeckites indicate that the p-t conditions are t=500～600 ℃,p≤0.3 GPa,which display the characteristics of low pressure metamorphic facies.Combined with the data from early investigations for’glaucophane’in the Zhangbaling area,and contrasted to the data for glaucophane from Zhaosu and Kuche,Tianshan and Qiangtang,Tibet,no glaucophane appears certainly across the Zhangbaling area,and a detailedstudy is necessary for the identification of blueschist and low-tand high-p metamorphism.更多还原