摘要
北京十三陵地区中元古界长城系包括5个组:常州沟组、串岭沟组、团山子组、大红峪组和高于庄组,前2个组主要由碎屑岩组成,后3个组主要由碳酸盐岩组成。众多的沉积相标志反映:常州沟组属于滨浅海碎屑岩沉积环境;从串岭沟组开始,其沉积环境向碳酸盐岩沉积环境过渡;后3个组沉积时的环境为典型的陆表海碳酸盐岩沉积环境。在综合研究的基础上建立了沉积环境模式。另外,长城系还有许多特殊的沉积现象值得进一步研究和讨论:世界上最古老的宇宙球粒;高于庄组白云岩层面上双脊波痕的内碎屑颗粒成因和硅化白云岩内青鱼骨状层理及硅质团粒的成因;特别是在大红峪组首次发现太阳星云物质——碳质球粒陨石。
There are 5 formations in the Changcheng System of Mesoproterozoic in the Ming Tombs District, Beijing. They are named as the Changzhougou, Chuanlinggou, Tuanshanzi, Dahongyu and Gaoyuzhuang formations. The former two formations consist of siliciclastics, and the others are composed of carbonate rocks. Numerous sedimentary facies indicators indicate that the Changzhougou Formation was deposited in the shore zone and shallow marine environments. From the beginning of Chuanlinggou stage, the sedimentary environment changed from clastics to carbonate rocks. Thus, the sedimentary environment of the latter 3 stages were characterized by deposition of carbonate rocks in a typical epicontinental sea setting. The evolving sedimentary models of the Changcheng System were set up from the integrated study. In addition, related sedimentary problems need to be further investigated. They include problems such as the world oldest iron cosmic spherules, the origin of intraclastic grains with double crested wave rippling marks on dolomite bed surfaces, the origin of herringbone cross stratification in silicified dolomite and that of silicified pellets, and in particular the origin of the solar nebula material, namely carbonaceous chondrite discovered for the first time from the Dahongyu Formation.
出处
《古地理学报》
CAS
CSCD
2007年第5期461-472,共12页
Journal of Palaeogeography：Chinese Edition
基金
本文为国家自然科学基金(编号:49772121)的成果
关键词
北京十三陵
长城系
沉积相标志
环境模式
铁质宇宙球粒
碳质球粒陨石
Ming Tombs District, Beijing, Changcheng System, sedimentary facies indicators, environment models, iron cosmic spherules, carbonaceous chondrite
