山东荣成马草夼大理岩中的榴辉岩岩石地球化学特征及成因  

Geochemical Characteristics and Genesis of Eclogites in Marble from Macaokuang Peridotite in Rongcheng Area,Shandong Province

作　　者：韩宗珠[1,2] 塔金璐[2] 张贺[2] 钟伟[2] 葛建刚[2] 张玉祥[2] 

机构地区：[1]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100 [2]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2014年第12期82-89,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41376053);中国海洋大学国家大学生创新性实验计划项目(201110423022)资助

摘　　要：山东荣成马草夼榴辉岩呈条带状或透镜状产出于大理岩中,对其进行了岩石学和地球化学研究。研究表明,其原岩可能为辉石质岩石,且经过了一定程度的分异作用,暗色矿物发生堆晶作用,在微量元素原始地幔标准化蛛网图中,Th明显的亏损,U强烈富集,Ce也呈微弱程度亏损,在稀土元素球粒陨石标准配分模式图中,呈左倾分布模式。岩石的原岩构造环境分析表明其接近板内构造环境,其原岩可能为结晶分异之后矿物堆晶作用形成的辉石质岩石。We have done petrological and geochemical research to annalyze eclogites which produced in marble as banded and lentoid from Rongcheng Macaokuang areas. By analyzing the major elements of rock samples, we found that original rocks had undergone a certain degree of differentiation, and the dark minerals had experienced mineral accumulation. In the spider diagrams of primitive mantle-normalized trace elements, REE La, Ce, Sin, Nd and Th are significantly depleted while U is strongly enriched. In the spider diagrams of chondrite-normalized REE, they show a mode that LREE are seriously depleted while HREE are relatively enriched. Geochemical characteristics indicate that the rocks are produced from certain places which get close to the plate tectonic environment, and the original rocks perhaps be the pyroxene rocks which result from the mineral accumulation after the crystal fractionation.

关 键 词：榴辉岩 大理岩 地球化学 成因 荣成 

分 类 号：P595[天文地球—地球化学]