摘要
本文参照北京西山及国内外寒武系相关地层资料,在古生物学和地层学研究的基础上,对北京西山寒武纪海相红层进行了初步研究。在西山寒武纪地层中,共识别出14层(套)海相红层,分别为:早寒武世下苇甸组1层B∈RB1(沧浪铺期);早—中寒武世早期3层B∈RB2、B∈RB3及B∈RB4(馒头期—毛庄期);中寒武世中期3层B∈RB5、B∈RB6及B∈RB7(徐庄期);中寒武世晚期1层B∈RB8(张夏期);晚寒武世早期2层B∈RB9、B∈RB10(崮山期);晚寒武世中期3层B∈RB11、B∈RB12、B∈RB13(长山期):晚寒武世晚期1层B∈RB14(凤山期)。所有14层海相红层形成于陆表海浅水环境,它们均属陆棚红层。红层分布模式说明,它们的形成与其附近的古陆有关。依据海相红层及其上下层位中所含的三叶虫化石,本文初步论述了各海相红层的大致时代,并与其他地区的同期海相红层进行了对比。此外,本文还讨论了山西东部寒武纪海相红层的层序和全球早寒武世沧浪铺期海相红层的广布事件。
According to previous work on stratigraphy and palaeontology,fourteen Cambrian marine red beds can be recognized from Western Hills,Beijing.They are:Early Cambrian B∈RB1(Tsanglangpu Stage),Early Cambrian to early Middle Cambrian B∈RB2~4(Longwangmiao Stage to Maozhuang Stage),Middle Cambrian B∈RB5~7(Hsuchuang Stage=Xuzhuang Stage),B∈RB8(Zhuangxia Stage),Late Cambrian B∈RB9,10(Gushan Stage),B∈RB11~13(Changshan Stage)and B∈RB14(Fengshan Stage).All of them were deposited in epicontinental seas and they are of shelf red beds(SRBs).Their distribution pattern indicates that the marine red beds owe their origin to the nearby oldlands.Based on the trilobite fossils contained in the marine red beds and the upper and lower layers of the marine red beds,this paper preliminarily discusses the general ages of the marine red beds and makes an accurate correlation with the coeval marine red beds in the other regions of China.Besides,the distribution of the Cambrian marine red beds from the east part of Shanxi Province and the global spatial distribution of Early Cambrian(Tsanglangpu Stage)marine red beds are discussed.The marine red beds of Early Cambrian(Tsanglangpu Stage)widely spread not only in North China and South China,but also in D.P.R.of Korea,R.of Korea,Australia,Pakistan,Jordan,Israel,Turkey,Spain,the United Kingdom,the United States of America and Argentine.
作者
李明
林宝玉
LI Ming;LIN Baoyu(Institute of Geology,Chinese Academy of Geological Sciences,Key Laboratory of Stratigraphy and Palaeontology of Ministry of Nature and Resources,Beijing 100037,China)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2022年第6期1895-1921,共27页
Acta Geologica Sinica
基金
国家自然科学基金项目(编号42172035)
中国地质调查局地质调查项目(编号DD20221649,DD20221647)联合资助的成果。
关键词
寒武纪
海相红层
分布
时代
北京西山
沧浪铺期
广布事件
全球
Cambrian
marine red beds
distribution
ages
Western Hills
Beijing
Tsanglungpu Stage
widespread events
global
