王成;任利民;张晓军;余国飞;方磊;

• 1:新疆地质调查院
• 2:中国地质大学(武汉)地球科学学院
• 3:江西省核工业地质局266大队
• 4:中国地质大学(武汉)资源学院

摘要(Abstract)：

内蒙古崇根山SSZ型蛇绿岩位于兴蒙造山带北部的二连浩特-贺根山蛇绿岩带,为贺根山蛇绿岩中出露面积最大、岩性出露最为齐全的蛇绿岩块,主要组成端元为橄榄岩,少量堆晶辉长岩和拉斑玄武岩片。研究表明,该玄武岩为一套前弧玄武岩,岩性为低钾拉斑玄武岩。岩石w(SiO_2)为48.58%～51.23%,含较低的TiO_2(1.63%～2.08%),富Na_2O (3.13%～4.73%)而贫K_2O(0.05%～0.20%),Na_2O/K_2O为23.7～79.0;岩石具有亏损型稀土元素配分模式,类似N-MORB,微量元素富集Rb、Ba、U、Ta、Hf,亏损Th、Nb、Sr,元素质量分数普遍略高于N-MORB,与弧拉斑玄武岩相似。地球化学特征上兼具洋中脊与岛弧双重特点,且更偏向洋中脊,与马里亚纳前弧玄武岩(FAB)相一致。综合分析前人对于崇根山蛇绿岩块及区域蛇绿岩同位素年代学研究成果表明,二连浩特-贺根山蛇绿岩带在早石炭世存在前弧玄武岩,说明二连浩特-贺根山洋盆在早石炭世发生了洋内初始俯冲和洋陆转化岩浆作用。

关键词(KeyWords)： 前弧玄武岩;地球化学;早石炭世;崇根山SSZ型蛇绿岩;二连浩特-贺根山蛇绿岩带

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质调查项目(1212011220448)

作者(Author): 王成;任利民;张晓军;余国飞;方磊;

Email:

DOI: 10.19509/j.cnki.dzkq.2019.0301

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