论文部分内容阅读
一、稀土元素数据整理方法利用稀土元素丰度资料说明地质现象时常常使用数值法或作图法来表现。A．数值法①稀土元素浓度的直接比:如∑Ce/∑Y,Eu/Sm Sm/Nd等。不同成因的岩石,这些比值不同,所以它可作为岩石成因的标志。此外,岩石类型不同,某些比值一般也不同。例如Eu/Sm比值(表1)。由表还可看出,岩石越基性,Eu/Sm值越大,越酸性其比值越小,因此Eu/Sm值反映了岩浆演化的一般特点。Sm/Nd比值(以0.33为界)能把岩石区分为轻稀
First, the REE data processing methods The use of rare earth element abundance data to illustrate geological phenomena often use numerical method or mapping method to performance. A. Numerical method ① The direct ratio of rare earth element concentration: such as ΣCe / ΣY, Eu / Sm Sm / Nd and so on. Rocks of different origin, these ratios are different, so it can be used as a sign of the rock cause. In addition, the rock types are different and some ratios are generally different. For example, the Eu / Sm ratio (Table 1). As can be seen from the table, the more basic the rock, the greater the Eu / Sm value, and the lower the acidity ratio. Therefore, the Eu / Sm value reflects the general characteristics of magmatic evolution. The Sm / Nd ratio (defined as 0.33) divides the rock into light lean