摘要
本文对贵州石炭纪岩相古地理各单元的沉积特征进行描述。并利用多条剖面的近300多件样品的微量元素、同位素等分析资料,总结出各种岩石类型的微量元素分布情况。同时,对近百条割面的各种沉积环境成相中的岩石类型进行百分统计,从各种环境中的岩石组合与各种岩石类型中的微量元素分布情况,推算出各沉积环境成相带内微量元素的分布情况。另外,还建立了被动大陆边缘拉张盆地沉积的微量元素分布规律:从滨岸到开阔台地,微量元素Sr逐渐增加,而Ba、K、B、Be、Na、Ni、Ti、Cr、Mn等元素含量逐渐减少,而台盆沉积含有很高的Ba、K、Na、Ni、Ti、Cr、Mn,但Sr含量却很低。台地边缘斜坡相带,则是台盆与开阔台地之间的过渡地带,其既富含Sr。又富合Ba、Mn、Ti、Cr、Ni、K、Na等。
Sediment character of Carboniferous facies and palaeogeography units has been described, and trace element distribution of various rocks has been summarized by using trace element and isotipa data of 300 samples collected frommany sections. Simultaneously, statistics in percentage of various rock types in sediment environment have been made and according to rock assemblage of various sediment environment and trace element distribution of various rock type, trace element distribution of each sediment environment or facies can be calculated. In addition, model of trace element distribution has been established in passive continental margin spreading basin: i. e. Sr—element increase gradually and Be K, Na, Ni, Ti,Cr,Mn—elements is very rich, but lack in St—element. platform margin slope zone between platformbasin and open platform, it's rich in Sr—element, and rich in Ba, Mn, Ti, Cr, Ni, Na, k—elements.
基金
地矿部"七五"重点攻关项目(第15项目)的部份成果
关键词
贵州
石炭纪
沉积
地球化学
sedimentary environment
trace element
sediment geochemical
carboniferous
Guizhou
