论文部分内容阅读
湖南益阳市南西变基性火山岩系中有两层熔岩呈岩流产出,具典型水下喷溢的枕状构造,处于元古界冷家溪群(Ptln)和板溪群(Ptbn)基性—中性—中酸性巨厚火山—沉积旋回底部,下伏深海浊积岩系。该岩流的岩石化学特征与南非巴伯顿、苏联东欧(科拉半岛、库尔茨克)等地玄武岩质科马提岩极为近似,其平均值:SiO_2 50.69％,TiO_2 0.53％,MgO11.08％,Na_2O 1.39％,K_2O 0.3％,P_2O_5 0.067％;Cr、Ni、Au含量高。在Al_2O_3—FeO~*/(FeO~*+MgO)、TiO_2—SiO_2、TiO_2—MgO、MgO—CaO—Al_2O_3等科马提岩判别
There are two layers of lava in the southwestern basement volcanic rocks of Yiyang City, Hunan Province, which are characterized by lithofacies and pillow-shaped structures with typical underwater spout. They are located in the basement of Ptln and Ptbn in the Proterozoic. - Neutral - Moderately acidic volcano - Sedimentary bottom, underlying deep-sea turbidite series. The petrochemical characteristics of this rock flow are very similar to the basalt komatiites in Barberton, South Africa, Eastern Europe (Kola Peninsula, Kultz) and the like, with an average of 50.69% for SiO 2, 0.53% for TiO 2 and MgO 11. 08%, Na_2O 1.39%, K_2O 0.3%, P_2O_5 0.067%; Cr, Ni, Au content is high. In the determination of komatiite such as Al_2O_3-FeO_ * / (FeO_ * + MgO), TiO_2-SiO_2, TiO_2-MgO and MgO-CaO-Al_2O_3