摘要
通过对铜仁坝黄地区下寒武统九门冲组的岩石化学和地球化学研究,认为具有以下特征:①岩石化学方面,有典型的硅质岩,此种硅质岩在成因上与海底喷气作用有关;而在Al、K图解,Si、Ca(Mg)图解上,表现出相类似的特征;同时在整个岩系中,SiO_2与Ni、Mo呈现相一致的演化规律。②地球化学方面,有益元素P、Mo、V以及Ni、Pt族元素,U、TR等均富集在九门冲组的底部;元素分配上该组岩系突出的表现出Ba含量的较大值(平均值高出地壳丰度27倍以上);在有益元素和微量元素的R型聚类分析的谱系图中,呈现出亲硫亲生物元素和以贵金属为主的元素两大类,而揭示了元素之间的内在联系。上述特征,从一个侧面反映出坝黄地区下寒武统的有益组分如Ni Mo Pt族元素等的来源和富集,是与海底喷气作用密切相关。
The researches of Petrochemistry and geochemistry show that Jiumenchong Formation of Lower Cambrian age has following features:
1. There occur typical silicon rocks related to exhalation sedimentation . They apparent similar featues on Al- K diagram and Si -Ca(Mg) diagram and there is an identical evolution between Si and Ni,Mo.
2. The beneficial elements of P,Mo,V as well as Ni, Pt-group elements and U, TR elements enriched in the bottom of Jiumenchong Formation and the barium is most aban-tant in the Formation (the average value is over twenty - seven times as high as the Earth crust abundance ). The elements can be divided into tow types,1. e. , chalcophile element and biophile elememt and precious element as shown on hierarchical diaguam of R-type cluster analysis which indicates the relationship betwwen elements.
So,the above features indicate that the source and enrichment of beneficial elements such as Ni,Mo. patinum family elements, etc . in Lwer Cambrian System in Bahuang area are closely related to submarine exhalation sedimentation.
出处
《贵州地质》
1993年第2期163-170,共8页
Guizhou Geology
基金
全国煤炭总公司资助课题
