宜溧地区花岗岩类岩石谱系单位的划分

宜溧地区中生代侵入体经地面调查和对比分析,依据花岗岩类岩石谱系单位划分原则,可划分为2个超单元(序列)、7个单元以及1个独立侵入体和2类脉岩.戴埠序列岩石化学特征为钙碱质,平桥序列为弱碱质,反映两个序列岩浆有着明显的差异,组合变异图进一步表明两序列的岩浆演化机理不同,是不连续和彼此独立存在.戴埠序列为轻稀土富集型,平桥序列属于重稀土富集型,应归属A型花岗岩系列.

Classification of Lineage Units for Granitoid in the Areas of Yili

Through field survey and contrast, and based on the classification principles of lineage unit for the granitoid, the Mesozoic intrusives in the areas of Yili can be divided into two super units(series), seven units and one independent intrusive and two types of dike rocks. The petrochemical properties for Daibu series are calc-alkaline, Pingqiao series weak alkaline, reflecting a distinct difference in evolution mechanism for the two series of magma and the difference is further proved by the combination variation chart that demonstrates the evolution mechanism is discontinuous and independent. Daibu series is proved to be of light rare earth concentration and Pingqiao series is of heavy rare earth concentration, attributed to A-type granitoid rock series.