云南剑川—老君山地区新生代岩浆岩稀土元素特征及构造环境分析

剑川－老君山地区新生代岩浆岩尾轻稀土富集型，各岩类稀土元素标准化配分曲线显示相互平等的特点，稀土含量大致同步变化，表明它们是由地壳硅铝层物质重熔形成的同源岩浆结晶分异而成。岩浆在上侵之前曾发生过分异作用，轻重稀土发生了一定程度的分馏，并导致了铕的轻微亏损。各单元岩石具同源性，岩浆活动发生在板块会聚区造山晚期和造山后阶段。

Tectonic environment analysis and characteristics of REE of Cenozoic magmatic rocks of Jianchuan-Laojunshan area, Yunnan province

Cenozoic magmatic rocks in Jianchuan Laojunshan area are of LREE rich type. REE show a parallel distribution pattern and generally synchronous variation of REE contents indicating that the magmatic rocks were originated from the crystalline differentiation of cognate magma formed by the remelting of sialic earth crust, and the magma was differentiated before its intrusion leading to certain fractionation of LREE and HREE and the slight deficiency of Eu. Therefore, magmatic rocks in different tectonic units are cognate ones, and magmatic activity took place at plate convergence area, and in late orogenic or post orogenic stages.