澄江动物群洪家冲剖面沉积环境分析  

ANALYSIS ON THE SEDIMENTARY ENVIRONMENT OF HONGJIACHONG SECTION OF CHENGJIANG FAUNA

作　　者：罗茂斌[1] 杨杰[1] 仝艳锋[1] 

机构地区：[1]云南大学,云南昆明650091

出　　处：《云南地理环境研究》2008年第6期11-16,63,共7页Yunnan Geographic Environment Research

基　　金：云南省应用基础研究计划面上项目(2007D012M)资助

摘　　要：下寒武统黑林铺组玉案山段洪家冲剖面的岩层主要以泥岩、粉砂质泥岩为主,且有粉砂质泥岩与薄层砂岩互层,岩石颜色偏深,胶结物多含铁泥质。岩石种类和岩石成分特征反映出这一地点的古沉积环境应为具有还原环境、低能水动力条件的外滨海地带。由铁泥质重结晶而形成的绢云母大量存在,说明这一地区在玉案山段沉积时期属于长期稳定的低级变质条件,而且海水温度较高。化石组合特征表明曾发生过频繁的风暴沉积,即显示平静的浅海环境曾经不断遭受强动力风暴破坏的近积风暴流沉积相特征。The shale rock of the Hongjiachong Section of the Yuanshan Member of the Heilinpu Formation during the Early Cambrian are mainly composed of mudstone and powder sandy mudstone with the mudstone and the powder sandy mudstone inter-laminated, having the deep color, agglutinated with iron muddy. The categories and characteristics of rock reflect the location of the ancient sedimentary environment should be outside the coastal zone with basic seawater and low-energy hydrodynamic environment. The massive existence of sericite, which recrystallized by the iron mud, accounts for that the deposition period of low metamorphic environment are long-term stability in the Yuanshan Member, and the temperature of sea are high. The fossils combined characteristics indicates that the region have been frequently storm deposits, which reveals that calm shallow had been unceasingly subjected to strong driving force of the storm damage.

关 键 词：澄江动物群 沉积环境 洪家冲剖面 岩石 化石 

分 类 号：P53[天文地球—古生物学与地层学]