摘要
经过野外宏观观测、室内显微分析及同位素年龄测定,基本厘定医巫闾山是一个白垩纪时形成的变质核杂岩。变质核杂岩中心为晚燕山期的医巫闾山二长花岗岩体,周围是由代表地壳深部变形特点的太古宇变质岩组成的变质核。变质核北面和东面以拆离断层与盖层下部中新元古界相接触,并为中新元古界组成的韧性流变的中间层所环绕。变质核西面以阜新盆地东南缘边界正断层( 孙家湾- 稍户营子正断层) 与盖层上部以脆性变形为特征的白垩纪碎屑岩相邻。变质核杂岩的变形片理、线理及运动指向说明该变质核杂岩为对称型变质核杂岩。
Yiwulüshan mountain is proved to be a metamorphic core complex formed in Cretaceous according to field survey, microstructural analysis, and isotropic dating. The center of the metamorphic core complex is Yiwulüshan Late Yanshanian adamellite. The metamorphic core consists of Archaean metamorphic rock which represents ductile deformation in the crust deep and surrounds the Yiwulüshan adamellite. The lower part of the cover layer consists of Middle and Upper Proterozoic,spreads in the northern part and the eastern part of the metamorphic core and connects with the metamorphic core by a detachment fault. It is cut by Sunjiawan-Saohuyingzi normal fault in the west of the metamorphic core. The metamorphic core complex is considered to be symmetric type metamorphic core complex in the light of deformation schistosity, lineation, and the indication of the shear movement.
基金
地矿部九五重点科技项目!<燕山造山带造山作用过程及动力学机制>
