富蕴县乌恰沟一带变质岩地层划分和时代归属

摘要

富蕴县乌恰沟一带位于阿尔泰山南缘,大地构造位于查尔斯克-哈夏乔拉结合带以北,属西伯利亚板块南缘活动带.长期以来,对该带出露的一套中深度变质岩形成时代存在较大分歧.通过变质程度研究,参考同位素年龄资料,对该地区变质岩地层进行重新划分,对形成时代进行重新厘定.将未变质(或轻微变质)的一套中-酸性火山岩、火山碎屑岩、碎屑岩,暂划为上奥陶统东锡勒克组.%Wuqiagou lies to the south of Altay mountains,In the geological structure it lies in the north of the bridge Charles grams-Haxia pull suture zone north, which is the southern margin of the Siberian plate active zone with the history of the set of exposed rocks in the depth of understanding of the formation age of inconsistent divergence. 1:5 million mapping through the strata of the study,according to their rank, reference isotopic age data.Metamorphic rock formation in the region was redrawn to its re-formation time was determined. Will not exist during metamorphism(or minor deterioration) set in-acid volcanic rocks,volcanic rocks,clastic rocks,temporarily designated as the Upper Ordovician of the East Xi Leke group,basically denied the Lower Devonian cambron iron Fort group and the Lower Devonian in the presence of the Altai group.