【摘要】 运用因子分析、聚类分析及相关分析等多元统计分析方法对燕山地区宣龙坳陷中元古界硅质岩主元素进行分析。主元素聚类为陆源物质(Al2O3、TiO2、K2O和P2O5)、海洋物质(SiO2、CaO、MgO和烧失量)和热液物质(Fe2O3、MnO、Na2O和FeO)3类。每一类中各种元素之间的相关特征存在差异。提取的第1主因子、第2主因子、第3主因子分别反映了海洋因子、陆源因子和热液因子的特征,而第4主因子(Na2O和FeO)可能指示了强酸性沉积环境。研究结果表明,区内硅质岩是在有一定热水参与的强酸性海洋环境中正常化学沉积的产物。更多还原

【Abstract】 Factor analysis,cluster and correlation analyses were applied to study the major element of the siliceous rocks in Middle Proterozoic of Xuanlong Depression.These major elements were divided into three types by cluster analysis,including terrigenous material(Al2O3,TiO2,K2O and P2O5),marine material(SiO2,CaO,MgO and LOI),and hydrothermal material(Fe2O3,MnO,Na2O and FeO).There existed differences in the correlation between the various major elements in each category.The first,second,third factors reflected the marine factor,continental factor and thermal liquid factor respectively,while the fourth factor(Na2O and FeO)would indicate the sedimentary environment of strong acid.The results show that the genesis of Xuanlong siliceous rocks is caused by integrated action of the hydrothermal deposit and normal deposit during the deposition of acidic marine material.更多还原