一、地质特征(1)奥陶系下统乌宾敖包组(O1w)。在工作区大面积出露,主要出露奥陶系下统乌宾敖包组第二及第三岩性段:第二岩段(O1w2),主要岩性为砂质板岩、泥板岩、凝灰质板岩夹长石砂岩、长石石英砂岩及灰岩透镜体组成,与第三岩性段呈整合接触,与第一岩性段呈断层接触。第三岩段(O1w3),主要岩性为长石砂岩夹粉砂质板岩、变泥岩、灰岩和石英岩等组成,与第二岩性段 First, the geological characteristics (1) Lower Ordovician Wu Bin Obo group (O1w). A large area of ​​the work area is exposed, mainly revealing the second and third lithologic sections of the Ordovician lower Wubin Obo Formation: the second rock section (O1w2), with the main lithology of sandy slate, Tuffaceous sandstone, feldspathic quartz sandstone and limestone lens, which are integrated with the third lithology and are in fault contact with the first lithology. The third rock (O1w3) is composed of feldspathic sandstone, siltstone, metamorphic mudstone, limestone and quartzite,