蓟县中元古界高于庄组沉积岩系及地质意义  

Sedimentary Rocks of Gaoyuzhuang Formation of Mesoproterozoic in Jixian County and Its Geological Significance

作　　者：杨云祥[1] 郭峰[2] 杨友运[2] 

机构地区：[1]延长油田股份有限公司,陕西延安716002 [2]西安石油大学油气资源学院,陕西西安710065

出　　处：《西北地质》2011年第2期1-7,共7页Northwestern Geology

基　　金：国家青年自然科学基金项目"古海洋环境与生物礁发育及兴衰的响应"(41002043);西安石油大学科技基金项目

摘　　要：天津蓟县元古界剖面具有极高的综合研究价值,而高于庄组在该剖面中居于承上启下的位置。高于庄组在整个中、新元古界剖面中厚度较大,岩石类型多样且成因特殊,主要岩石类型包括碳酸盐岩、泥岩、硅质岩和石英砂岩。碳酸盐岩主要为泥晶灰岩、瘤状灰岩、砂屑灰岩、臼齿灰岩及粉细晶白云岩等。硅质岩包括燧石和沉积石英岩,沉积石英岩具鲕状或砾状结构。仅在本组底部见石英砂岩。上述岩石特征表明,蓟县地区在中元古代长城纪晚期的高于庄期以浅海中深缓坡沉积为主,有短期的潮坪碳酸盐沉积环境,沉积作用受大红峪时期火山物质的影响。臼齿灰岩的存在可能提供华北地区中元古代年代地层学和构造沉积演化研究的新证据。The Proterczoic section in Jixian,Tianjin,is highly worthy of an integrated research.The Gaoyuzhuang formation plays a the key role of linking the old and new strata.Gaoyuzhuang formation is rather thick compared with the whole Proterczoic section,and it has multiple types of rocks with special origins.The main kinds of rocks include carbonate rocks,mudstone,silicalite,and quartz sandstone.The carbonate rocks are predominantly composed of pelsparite,nodular limestone,calcarenite,Molar-tooth carbonates,and other fine-grained dolomite.Silicalite includes chert and depositional quartz with textures of oolite and pebble.The quartz sandstone appears at the bottom of Gaoyuzhuang formation.The petrology shows that the depositional environment of the study area is carbonate tide-flat and shallow sea,which is also strongly affected by the volcanic materials and wind brought clastics from Gaoyuzhuang formation.Molar-tooth carbonates are expected to propel the study of the Proterczoic chronology and tectono-sedimentary evolution of North China.

关 键 词：蓟县 中元古界 高于庄组 沉积岩系 地质意义 

分 类 号：P588.2[天文地球—岩石学]