北京西山下苇甸剖面特殊沉积现象对比  

Comparison of special sedimentation in the Xiaweidian section of the Western Hills of Beijing

作　　者：付茜[1] 

机构地区：[1]中国石化江苏油田勘探开发研究院,江苏扬州225100

出　　处：《地质学刊》2017年第2期218-223,共6页Journal of Geology

基　　金：国家自然科学基金项目"华北克拉通北缘寒武纪生物丘沉积组构多样性研究"(41472090)

摘　　要：北京西山下苇甸剖面崮山组和凤山组地层分别属于寒武系第三统和芙蓉统。其中,崮山组发育浅水叠层石生物丘,凤山组发育浅水叠层石生物层,二者都发育深水环境碳酸盐泥丘,代表了碳酸盐岩沉积的多样性;大量存在的不同类型的竹叶状砾屑灰岩,代表了"风暴海"时期特殊的沉积组构。特殊沉积组构作为寒武纪贫乏骨骼风暴海后中奥陶世生物大辐射前的特殊现象,为研究较深水背景下微生物造礁作用提供了典型的岩石记录,同时也代表了这一特殊时期的沉积作用样式。The Gushan Formation and the Fengshan Formation of the Xiaweidian section of the Western Hills of Beijing, belong to the Cambrian Third Series and Furongian Series respectively. The former develops shallow stromatolitic bioherm, and the later develops shallow stromatolitic biostrome. Both have developed carbonate rock mudlump in deep water, indicating the diversity of carbonate rock sedimentary environment. The finding of large number of various wormkalk calcirudites represents a special sedimentary fabric in the ＂stormy sea＂ period. As a particular phenomenon after Cambrian skeleton-poor stormy sea period and before the Middle Ordovician bio- logical radiation, this fabric could be a typical rock record of microbial reef-building in deep seas and a good example of the sedimenta- tion pattern in this special period.

关 键 词：寒武纪 叠层石 竹叶状砾屑灰岩 生物丘 下苇甸剖面 北京西山 

分 类 号：P588.248[天文地球—岩石学]