摘要
综合运用因子分析和聚类分析方法,划分出松辽盆地西部白垩系地层的重矿物组合,结合每种重矿物数据特征求出其概率分布图、P-P正态概率图和P-P自然对数正态概率图,定性辨别每种矿物来源是否单一,用研究区实际地质数据资料,对每段根据重矿物组合判断的母岩类型进行约束和校正。判别英台地区下白垩统的母岩主要是中酸性岩浆岩,其次为中基性岩浆岩以及少量的变质岩。齐齐哈尔地区下白垩统的母岩也是以中酸性岩浆岩为主要母岩类型,但英台沉积体系的中基性岩浆岩含量要比齐齐哈尔相对高一些,齐齐哈尔沉积体系酸性岩浆岩则比英台沉积体系更为发育,且其岩石变质程度深。
The heavy mineral combinations of Cretaceous strata in Songliao Basin were compartmentalized through factor and cluster analyses. Applying these meathods and P--P normal probability plots and P--P natural log normal probability plots, authors analysed the origins of the heavy minerals qualitatively. Using the geologic data of the research area to restrict and emend the type of the motherrock, authors recognized that the types of the motherrock in Yingtai sedimentation system are mainly neutral--acidic magmarock, the neutral--basic magamarock and metamorphic rocks are secondary; the Qiqihar sedimentation system's motherrock is similar to that of Yingtai sedimentation system, but the content and the metamorphic grade of the neutral--acidic magmarock are higher than Yingtai's.
出处
《世界地质》
CAS
CSCD
2003年第4期331-338,共8页
World Geology
关键词
统计分析
重矿物组合
母岩类型
statistical analysis, heavy mineral combinations, the type of motherrock
