北京“洼里砾岩”地质特征及时代讨论  

Discussion on Geologic Characteristics and Age of Wali Conglomerate

作　　者：柯柏林 

机构地区：[1]北京市地质勘察技术院,北京102218

出　　处：《北京地质》2005年第3期11-15,28,共6页Beijing Geology

摘　　要：洼里砾岩的隐伏性和岩性特征决定了确定其成因及地层归属的困难。由于洼里砾岩紧邻八宝山断裂和黄庄-高丽营断裂,并且赋存丰富的地下水,所以研究洼里砾岩的成因和地层时代归属具有重要的基础地质和工程地质意义。随着近年地热深钻孔对洼里砾岩的揭穿,揭示其与下伏侏罗系九龙山组呈角度不整合接触,岩性特征表明它是由流水沉积作用形成的,属正砾岩岩块砾岩类,地层时代应归属侏罗系上统髫髻山组的下部。It is difficult to determined the origin and age of the result from its concealment and rock characters. Due to storage Wali Conglomerate, the difficulty abundant groundwater and in the vicinity of the Babaoshan fault and Huangzhuang-Gaoliying fault, it has important basis geologic and engineering geological significance to study the origin and age of the Wali Conglomerate. In recent years, the data of geothermal gun drilling reveal that the contact relation of the Wali Con- glomerate and underlaying Jiulongshan Formation of Jurassic middle series is angular unconformi- ty, and rock characters indicate conglomerate belong to the block its formation due to the deposition of running water. The Wali conglomerate class of the boulder conglomerate, it is the under stratum of Tiaojishan Formation, its age of the stratum belong to the Jurassic upper series.

关 键 词：北京 洼里砾岩 髫髻山组 地层时代. 

分 类 号：P588.212.5[天文地球—岩石学]