北山地区红石山蛇绿混杂岩组成及地质意义

摘要

Ophiolite mélange belt consists of ophiolite microlithon and bilateral continental margin microlithon.Out-crop is integrated and ophiolite is most basic volcanic rock which is decomposed by paulopost structure and in which euabyssite silicalite and deep-water flysch deposit are lacking.The sedimentation construction and lithological combina-tion of land-source microlithon are just like mélange belt bilateral Lvtiaoshan Formation and Baishan Formation’s.The definitude of these microlithon plays an important part in roundly knowing formation and evolvement of Hongshishan. Besides,it also has directive significance on lithostratigraphic establishment in Early Carboniferous Hongshishan-Heiy-ingshan fault rift and faulted depression zone.%甘蒙北山地区红石山蛇绿混杂岩带由不同成因的岩片，包括镁铁质和超镁铁质岩、堆晶岩、硅质岩及两侧陆缘岩片构成。蛇绿岩在红石山出露较完整，东以基性火山岩为主，是一个被后期构造肢解的蛇绿岩，放射虫硅质岩和深水复理石沉积不发育。陆缘岩片沉积建造、岩性组合特征与混杂带两侧绿条山组、白山组特征一致，这些岩片性质的厘定，为全面认识红石山有限洋的形成演化具重要意义，并为石炭纪红石山-黑鹰山裂谷裂陷带岩石地层的划分提供新思路。恢复晚古生代红石山有限洋盆充填演化特征，可为晚古生代银额盆地油气地质条件评价提供基础资料。