早寒武世早期贵州织金含磷岩系地球化学特征与成磷作用

对贵州织金三甲地区寒武系底部戈仲伍组含磷岩系进行了系统的地球化学研究,根据稀土元素、微量元素和一些常量元素及氧化物等在剖面上的变化规律,结合剖面上小壳动物化石富集特点,认为寒武系底部小壳动物化石丰度与成磷作用没有明显的关系,而与磷灰石矿物含量多少关系密切;磷块岩中稀土元素富集与磷灰石矿物含量有显著的正相关关系,与小壳动物化石丰度没有相关性,并提出在织金寒武系底部有两个成磷期。

GEOCHEMISTRY AND GENESIS OF THE EARLY CAMBRIAN PHOSPHORITES IN ZHIJIN, GUIZHOU

Phosphate concretions from the Gezhongwu Formation of the Sanjia section, Zhijin, Guizhou, have been documented systematically. In terms of the variation rules of REE, trace elements, major elements and oxides, in combination with the enrichment characters of small shelly fossils, it is considered small shelly fossils from the bottom of Cambrian contributed to the formation of phosphate concretions. However, the phosphorites are closely related to the phosphate concretions. The high concentration of REE has no obvious bearing on the abundance of small shelly fossils, but it is closely related to phosphorites. It is also suggested that there are two stages of P deposition at the bottom of Cambrian.