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前言本区火山岩为予西熊耳群火山岩的西延部分,1∶20万区测资料将本区划分为上熊耳群。其时代问题,多数单位认为属震旦系下统,在本区与下伏铁铜沟组石英岩呈平行不整合接触。上部与震旦系中统下部的高山河组和白玉沟组石英岩呈整合过渡关系。本区火山岩分布面积约260平方公里,1973年我们在该区部分地区进行普查找矿工作。现将工作初步成果简介如下。
Preface The volcanic area in this area is the westward extensional part of volcanic rocks in the Xionger Ear Group. The data of 1: 200,000 areas divide the area into the upper bear ear group. In its era, most units believed that they belonged to the Sinian system and were in parallel contact with the underlying Tiesuigou quartzite in this area. The upper part is in an integrated transitional relationship with the Gaoshanhe Formation and the Baiyuagou quartzite in the lower part of the Sinian Central Ordos. Volcanic rock area of about 260 square kilometers area, in 1973 we in some areas of the census prospecting work. Now the preliminary results of the work are as follows.