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阿尔曼太蛇绿构造混杂岩分布在我国新疆准噶尔盆地北部地区,阿尔曼太蛇绿构造混杂岩处在阿尔曼太古生代板內缝合带内,其主要构成成分包括蛇绿岩上覆岩系、泥盆纪蛇绿岩、外来岩片等构造块体和岩石变形基质。从新疆也布山一代展开对阿尔曼太蛇绿构造混杂岩的岩石地球化学特征研究,研究结果表明,蛇绿岩、辉绿岩和辉长辉绿岩与镁、低钾、高铁、钠等物质具有相同的特性;蛇绿岩石中稀土总含量比较低,主要为重型稀土亏损型,铕负异常,显示幔源特征,稀土配分模式为轻,重稀土分馏不明显,重稀土亏损强烈的表现形式;微量元素Rb-Yb-Nb图解样点均落入洋脊环境,岩石物源成分主要来自上地幔;采用Sm-Nb同位素示踪分析方法所分析计算的结果同样证明上地幔是太蛇绿构造混杂岩的来源。
The Armenian snake-green tectonic mélanges are distributed in the northern part of Junggar Basin, Xinjiang, China. The Armenian ophiolitic mélanges are located in the Arman intraplate suture. The major components include the ophiolite overburden, mud The basin Jiaged ophiolite, exotic rocks and other tectonic blocks and rock deformation matrix. From the Yabu Mountain in Xinjiang, the geochemical characteristics of the Armanite ophiolite mélange were studied. The results show that the ophiolite, diabase and gabbro diabase are associated with magnesium, low potassium, high iron and sodium The total content of rare earth in ophiolite is relatively low, mainly including heavy rare earth loss type, negative Eu anomaly, mantle source characteristics, light fractionation of rare earths, insignificant fractionation of heavy rare earths and strong loss of heavy rare earths . The trace elements of Rb-Yb-Nb trace elements all fall into the ocean ridge environment, and the source rocks of the rocks are mainly from the upper mantle. The results calculated and analyzed by the Sm-Nb isotopic tracing method also prove that the upper mantle is too ophiolite The source of tectonic mélanges.