内蒙古白音希勒地区宝力高庙组二段、三段火山岩特征分析

Study on the Characteristics of Volcano Rocks of 2nd and 3rd Sections in Baoligaomiao Group of Baiyinxile,Inner Mongolia

白音希勒地区大地构造位置位于二连-贺根山蛇绿岩带北侧,总体上属于西伯利亚板块东南缘古生代陆壳增生区。白音希勒幅火山岩整体构造格局为一复式向斜,向斜核部为宝力高庙组三段中性火山岩,翼部为宝力高庙组二段中酸性火山岩。其形成于碰撞后拉张环境,来源于相对亏损的岛弧玄武岩源区。

The tectonic position of Baiyinxile is located in the north side of the Erlian to Hegenshan ophiolite zone. As the whole, it belongs to the Paleozoic continental crust accretion zone in the southeastern margin of the Siberian plate. The vol- canic rock structure of Baiyinxile is a compound syncline. The syncline core is neutral volcanic rocks in the 3~ section of Baoligaomiao group; the wing is acidic volcanic rocks in the 2nd section of Baoligaomiao group. It was formed in the post collision extensional environment from the relatively defective island arc basalt source region.