节点文献
内蒙古色尔腾山绿岩的地球化学、年代学研究
STUDY ON GEOCHEMISRY AND CHORONOLOGY OF SE’ERTENGSHAN GREENSTONE,INNER MONGOLIA
【摘要】 通过对内蒙古包头公益明铁矿变基性火山岩的系统采样和测试分析 ,其常量、微量、稀土元素地球化学的特征表明该区的变基性火山岩形成于类似现代大陆裂谷的构造环境中。Sm -Nd、Rb-Sr同位素年代学的研究表明 ,色尔腾山绿岩下部的变基性火山岩形成于 2 80 0~ 2 90 0Ma的壳幔分异事件中 ,在新太古晚期 (2 5 0 0Ma± )遭受了角闪岩相 -绿片岩相变质作用的改造。而在中元古代 (16 0 0Ma± )由于受华北克拉通与西伯利亚克拉通裂解的影响 ,该区岩石的Rb -Sr体系又一次发生变化。研究表明 ,色尔腾山绿岩生成于中太古代 ,该区在古太古代可能就已存在稳定的陆壳
【Abstract】 This paper have studied the meta-mafic vocanics of Gongyiming iron deposite in Baotou,Inner Mongolia. The results of major and trace elements and REE indicated that the meta-mafic vocanics occurred in an environment where similar with modern continental rift. Studies on isotope of Sm-Nd and Rb-Sr indicated that the metabasic rocks formed in early new Archean 2 800~2 900 Ma and reworked in later new Archean(2 500 Ma) by metamorphinism. Because of North China claton departs from Siberia claton in mid-Proterozoic(1 600 Ma),Rb-Sr system of rocks have been changed.Se’ertengshan greenstone maybe occurred in mid-Archean. The region perhaps had steady continental crust during paleo-Archean.
- 【文献出处】 长春科技大学学报 ,Journal of Changchun University of Science and Technology , 编辑部邮箱 ,2001年03期
- 【分类号】P588.3;P597
- 【被引频次】21
- 【下载频次】252