河北平山小觉地区阜平岩群浅粒岩深熔作用的地球化学研究  

Geochemical study on anatexis of leucoleptites in Fuping Group of Xiaojue area, Pingshan County, Hebei Province

作　　者：万渝生[1] 杨崇辉[1] 

机构地区：[1]中国地质科学院地质研究所

出　　处：《岩石矿物学杂志》2002年第4期421-428,共8页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(4 9872 0 2 4);国土资源部地质调查项目(J1.3.1)

摘　　要：新太古代阜平岩群浅粒岩遭受深熔作用改造形成一些不同规模和形状的浅色体。与熔融母岩相比,其稀土元素和高场强元素含量相对较低,但大多数情况下具有相似的元素分布模式。然而,深熔作用刚开始时形成的浅色体,其元素含量、分布模式与熔融母岩完全不同,Nd同位素组成存在较大差别。随着深熔作用的进行,两者Nd同位素组成的差异越来越小,最后几乎完全消失。残余相副矿物,特别是锆石和磷灰石,对深熔浅色体的元素、Nd同位素组成的变化起了重要的作用。Anatexis resulted in the formation of leucosomes of various shapes and sizes in leucoleptites of Neoarchaean Fuping Group. The anatectic derivatives have lower REE content and HFS elements than their melting parent rocks. In most cases, however, they show similar element distribution patterns. The derivatives formed at the early stage of anatexis are different from the parent rocks in concentrations and distribution patterns of elements. With the development of anatexis, the difference between the derivatives and the parent rocks in Nd isotopic composition became smaller and smaller until approaching to disappearance at last. The accessory minerals, especially zircon and apatite, played an important role in the variation of elements and Nd isotopic compositions of the anatectic derivatives.

关 键 词：深熔作用 地球化学 钕同位素 浅粒岩 阜平岩群 河北 

分 类 号：P588.346[天文地球—岩石学]