| 辽宁翁泉沟橄榄玄武岩的地质地球化学特征及其形成环境 |
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| 引用本文：王翠芝,肖荣阁,刘敬党.2008.辽宁翁泉沟橄榄玄武岩的地质地球化学特征及其形成环境[J].地球学报,29(5):542-552. |
| DOI：10.3975/cagsb.2008.05.02 |
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| 基金项目:国家自然科学学基金项目(编号:40073013); 辽宁省国土资源厅项目(编号:20050142) |
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| 中文摘要:辽宁凤城翁泉沟橄榄玄武岩是翁泉沟硼镁铁矿的一种容矿岩石,它具裂谷环境下火山岩的特征:①带状分布,整合于早元古代的火山—沉积地层中,具气孔杏仁构造;②主量元素具富铁富镁的特点;微量元素中B、Cl、F、Rb、Cs、Th和U等含量较高;V,Cr,Ni等相对低些;高场强微量元素含量与相关比值与一般基性岩相似;Ti、Zr、Cr、Y等微量元素相互关系图解显示其原始岩浆具有板内玄武岩的特点;稀土分配型式明显向右倾斜,基本不显铈、铕异常,显示岩浆没有经过明显的分离结晶过程;③本区的橄榄玄武岩与同一硼矿成带上的营口大石桥后仙峪的镁橄榄岩和宽甸地区砖庙的镁质大理岩属于同一地层层位,都具富镁特征,都是辽东硼矿的镁质容矿岩石,它们在成因上具有内在联系,其稀土总量对比,显示它们同属大陆裂谷环境下岩浆活动的产物。 |
| 中文关键词:橄榄玄武岩 地球化学特征 形成环境 辽东地区 |
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| Geological and Geochemical Characteristics and Formation Environment of the Wenquangou Olivine Basalt in Liaoning Province |
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| Abstract:Wenquangou olivine basalt in Fengcheng of Liaoning Province is a kind of host rock in the Wenquangou ludwigite deposit and has many characteristics of rifting volcanic rock: ① the rock is in zonal distribution concordant with Early Proterozoic volcanic sedimentary rock, and has vesicular and amygdaloidal structures; ② the major elements indicate that the rock is rich in Fe and Mg, with relatively high B, Cl, F, Rb, Cs, Th, U and comparatively low V ,Cr, Ni. HFSE and related ratios are similar to those of common basic rocks. The relationships between Ti, Zr, Cr and Y show that the rock is somewhat a kind of intraplate basalt. The fractionation of LREE from HREE is obvious, negative Eu anomaly is invisible, and the REE pattern makes up a right oblique line, suggesting that the magma has experienced obvious fractionation; ③ a comparison of ΣREE between magnesian host rocks of borate deposits in Liaoning Province reveals that they have the same horizon and are all rich in magnesium, indicating that their rock-forming tectonic background is a rifting tectonic setting. |
| keywords:olivine basalt geochemical characteristics forming environment eastern Liaoning area |
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