桂北摩天岭和元宝山花岗岩类岩石地球化学及成因研究  

Geochemistry and Petrogenesis of Granitoid Rocks in Motianling Area and Yanbaoshan Area,Northern Guangxi

作　　者：韩宗珠[1] 衣伟虹[1] 李三忠[1] 来志庆[1] 张贺[1] 

机构地区：[1]中国海洋大学海洋地球科学学院,海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2012年第4期59-65,共7页Periodical of Ocean University of China

摘　　要：桂北摩天岭和元宝山地区广泛发育花岗岩类岩石。岩石地球化学研究表明,该区花岗岩类岩石具有相对富硅、钾,贫钠、钙,富集轻稀土以及Ba、Sr、Eu亏损的特征。岩石属于碱性-钙碱性高钾花岗岩,其分离结晶作用强烈,是岩浆演化至晚阶段的产物。对岩石的成因分析表明,该区花岗岩类岩石是在扬子板块与华夏板块以及个别小型岛弧地体的碰撞造山作用下形成的后造山花岗岩类。Granitoid rocks are widely distributed in Motianling Area and Yanbaoshan Area in northern Guangxi. According to rock geochemistry, these granitoid rocks are characterized by relatively enriched in Si.K and poor in Na, Ca.Ba.Sr.Eu, and have higher LREE. These rocks belong to alkaline --calcium-alkaline granites, and have high fractional crystallization. Based on the analysis of their petrogenesis, it is concluded that the granitoid rocks are formed at the collision between the Cathaysia block and the Yangtze block or between the Yangtze block and a certain island arc block, and are postorogenic granites.

关 键 词：花岗岩类 岩石地球化学 成因 桂北 

分 类 号：P588.12[天文地球—岩石学] P595[天文地球—地质学]