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本文在综合研究白云鄂博海西期花岗杂岩体岩石学特征的基础上 ,系统地分析测定了该杂岩体不同阶段花岗质岩石的稀土元素、微量元素和铅同位素组成 ,提出杂岩体的形成演化由早到晚 ,从花岗闪长岩→中粗粒黑云母钾长花岗岩→细粒黑云母钾长 -碱长花岗岩 ,是下地壳古老变质岩石经部分熔融作用产生的岩浆经不同程度的分离结晶作用所形成。白云鄂博花岗岩属于同碰撞花岗岩 ,形成于蒙古板块与华北板块的碰撞期。白云鄂博花岗杂岩体的稀土元素和微量元素地球化学特征明显不同于白云鄂博 RE- Nb- Fe矿床赋矿白云石大理岩 ,暗示稀土元素的成矿作用与花岗岩岩浆活动没有直接的成因联系。
Based on the comprehensive study on the petrological characteristics of the Hercynian granitoid complex in Bayan Obo, the authors systematically analyzed and determined the REE, trace element and Pb isotopic composition of granitic rocks at different stages of the complex, The formation and evolution of the body from early to late, from the granodiorite → coarse-grained biotite k-feldspar granite → fine-grained biotite k-long-alkali granite, is the lower crust of the ancient metamorphic rocks produced by the partial melting of the magma Different degrees of separation and crystallization formed. The Baiyunebo granite belongs to the same collision granite, formed during the collision between the Mongolia Plate and the North China Plate. The REE and trace element geochemical characteristics of the Baiyunebo granodiorite body are obviously different from the ore dolomite marble in the Bayan Obo RE-Nb-Fe deposit, suggesting that there is no direct genetic relationship between the mineralization of rare earth elements and granitic magmatism .