辽宁省中晚元古代—中生代页岩的化学元素丰度及其演化特征

EVOLUTION CHARACTERISTICS OF ELEMENT ABUNDANCE OF MID-LATE PROTEROZOIC-MESOZOIC SHALE IN LIAONING PROVINCE

作者利用全省不同地质时代和不同地质构造单元内的页岩41种元素的分析数据,计算出辽宁省全域内的页岩元素丰度休系。同时探讨了元素从中、晚元古代至中生代的演化规律,指出Ca、Cd、Sb、As、Na、Mn、P、Sr的元素丰度随时间序列的演化不断增长,B、F、K、Rb、W、Mg则显示出降低的趋势。某些元素比值从老至新表现出明显的规律性变化,如Sr/Ba、Ca/Mg值的演化具有阶段性,K/Na、Th/U值的演化具有方向性,Al/Ti值的演化则具有周期性。

Based on the analystical data on 41 kind of chemical elements in shale within different geological tectonic elements of different geological age overall Liaoning Province, element abundance system of shale in the whole province is carried out and its evolution regularity from Mid-Late Proterozoic to Mesozoic is discussed in the paper. The result shows that the element abundance values of Ca, Cd, Sb, As, Na, Mn, P, St, etc. increase, but B, F, K, Rb, W, Mg decrease. Some element ratios obviously and regularly changed with the time going, such as phasic evolution of Sr/Ba, Ca/Mg; directional K/Na, Th/U and periodic Al/Ti.