阿尔泰山南缘玛因鄂博构造带西段老变质岩岩块发现及地质意义

THE DISCOVERY OF OLD METAMORPHIC ROCK OF AYINERBUO TECTONIC ZONE WEASTERN PART AND ITS SIGNIFICANCE IN THE SOUTHMARGINE OF AITAY MOUNTIANS

阿尔泰山南缘玛因鄂博构造带西段原划下石炭统姜巴斯套组中发现大理岩、混合岩、黑云二长变粒岩、阳起石片岩、黑云母石英片岩等老变质岩岩块,多呈透镜状或断块产出,规模不一,大者宽达数百米,小者不足10 m,与围岩为断层接触.受强烈韧性剪切作用,广泛发育韧性变形.其中黑云母石英片岩可能为飞来峰构造,其余变质岩岩块是板块碰撞时构造卷入的基底岩块.

The old metamorphic block for example marble,migmatite,biotite-leptynite,actinolite-schist,biotite quartz-schist and so on were discovered in formerly lower carboniferous Jiangbasitao formation in mayinerbuo tectonic zone weastern part in the south margine of aitay mountians,the mass of their form is lenticular body or fault block,Their measurements rang from less than one metre to more than hectometer,fault contact with country rock.Standed strong ductile shear,ductile deformation develop widely.Among the old metamorphic block,biotite quartz-schist was the nappe outlier,the others were the foundation block which cause of formation was tectonic involvement in platecollision.