【摘要】 对满洲里-额尔古纳地区中生代塔木兰沟组、上库力组火山岩地球化学特征研究表明，它们形成于蒙古-鄂蒙茨克残余洋“剪刀式”闭合的总体构造背景下，但各组火山岩形成的具体构造属性不尽相同。塔木兰沟组火山岩形成于蒙古-鄂霍茨克残余洋开始“剪刀式”闭合，布列亚-佳木斯地体逆时针旋转的拉张环境；上库力组火山岩形成于布列亚-佳木斯地体剪切-走滑拼合的挤压环境；梅勒图组火山岩形成于张性裂陷环境。反映了中侏罗世-早白垩世本区处于旋转、拉张-挤压、走滑拼合-再旋转拉张的地球动力学过程。更多还原

【Abstract】 Based on the geological and geochemical studies of Mesozoic volcan ic rocks from the Manzhouli-E’erguna region, it is suggested that the Mesozoic volcanic rocks were developed on the tectonic background of the Mongolia-Ehucik e residue ocean that was closing in the scissors form, but each formation is dif ferent in tectonic character. The Tamulangou Formation was developed in the tens ional background, and the Shangkuli Formation in the shear-compressional backgr ound, the Mailetu Formation in the tensional background.更多还原