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,Sm,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.