北淮阳构造带东段中生代火山岩区域成岩规律  

Regional diagenesis study for Mesozoic volcanic rocks in eastern section of Beihuaiyang tectonic belt,China

作　　者：邬宗玲[1] 夏飞强 盛勇[1] 黄博[1] 

机构地区：[1]安徽省地球物理地球化学勘查技术院,安徽合肥230022

出　　处：《合肥工业大学学报（自然科学版）》2017年第5期690-696,共7页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省公益性地质工作资助项目(2012-g-13)

摘　　要：文章在北淮阳构造带东段中生代火山岩地质地球化学特征已有的研究成果基础上,对带内火山岩成因、演化及其动力学背景进行了概述。研究认为北淮阳构造带东段中生代各火山构造单元岩石的组合、火山活动时间等具有明显的差异性,火山活动有由西向东演化趋势。微量元素、稀土元素等地球化学特征显示,由早期到晚期火山岩碱度不断升高,同化混染作用和结晶分异程度逐步加强。火山岩地球化学特征与中国东部地球动力学背景发生转变相耦合,也是由其东邻郯庐断裂、西近大别罗田片麻岩穹隆的构造特殊性所决定的。Base on the systematic summarization of previous researches, this paper studies the diagenesis, evolution and dynamic settings of Mesozoic volcanic rocks in eastern section of Beihuaiyang tectonic belt. The paper argues that there exists obvious difference between each of the Mesozoic volcanic tectonic units in eastern section of Beihuaiyang tectonic belt. Chronology of the magmatic rocks displays a migration tendency from west to east. The characteristics of geochemistry, trace and rare earth elements indicate the difference between the basins formed in different periods. Over time from west to east, the volcanics tend to be more alkaline, more intensified in crystallization differentiation and assimilation contamination, more rich in LREE and poor in Eu, corresponding to the transforma tion of geodynamic settings in eastern China. It is also determined by tectonic distinctiveness of Beihuaiyang tectonic belt, which lies on the west of Tan-Lu fault and east of Dabie Luotian gneiss dome.

关 键 词：北淮阳构造带 火山岩 地球动力学 成岩规律 中生代 

分 类 号：P542.36[天文地球—构造地质学]