泥质岩稀土元素地球化学特征在物源分析中的意义——以鄂尔多斯盆地上古生界为例

THE GEOCHEMICAL CHARACTERISTICS OF RARE EARTH ELEMENTS OF THE SHALE ROCK IN THE GEOLOGIC SIGNIFICATION OF THE ANALYSIS OF THE SEDIMENTARY PROVENANCE: AN EXAMPLE IN THE UPPER PALAEOZOIC IN THE ORDOS BASIN

通过对鄂尔多斯盆地上古生界不同成因泥质岩样品稀土元素分析表明,稀土元素在杂色泥质岩中较为富集,在暗色泥质岩中亏损;在细粒沉积物中富集,在粗粒沉积物中亏损。指出从稀土元素的区域变化来看,盆地北部的物源主要来自于北部阴山古陆,且北部物源具有明显的东西分带性;稀土元素富集受沉积分异作用控制,由北向南随着泥岩粒度变细,稀土元素特别是重稀土元素富集。

Based on the analysis of rare earth elements of the shale rock of the upper Palaeozonic in the Ordos basin, the rare earth elements are enrichment in variegated mudstone and are deficit in melanoeratie mud rock. Miner-grain sediment had a high pink and micro-grain one had a very weak. According to the regional distribution of rare earth elements, the source of the northern Ordos basin come form the Yinshan ancient land, and the source had zonation in east and west area. The sediment differentiation affections control the enrichment of rare earth element. With mudstone particle size become fine form north to south Ordos basin, rare earth elements had a very pink.