摘要
首次报道贵州瓮安震旦系陡山沱组磷块岩中发现大型具刺疑源类 Papillomembrana compta。对震旦纪陡山沱期已发现的特色硅化或磷酸盐矿化大型具刺疑源类组合及国内外地层对比进行综合评述 ,结合同位素测年、化学地层和其他有关资料综合分析 ,对陡山沱组的年代问题进行探讨。现有研究资料表明 ,陡山沱组含大型具刺疑源类组合的层位应低于俄罗斯北部、澳大利亚、乌克兰、西伯利亚北部及加拿大纽芬兰等地发现多种典型伊迪卡拉期生物群的层位 ,年代应早于以伊迪卡拉期生物群爆发为标志的早期后生动物多样化的时段。
The large acanthomorphic acritarch Papillomembrana compta (Spejeldns, 1963) emend. Vidal (1990) is first reported from the Doushantuo phosphorites at Weng'an, Guizhou Province, South China. Based on the specifical assemblage of silicified and phosphatized acanthomorphic acritarchs found in the Sinian Doushantuo Stage and correlation with those elsewhere, the age of the Doushantuo Formation is discussed. Further bio- and chemostratigraphic correlations show that the Doushantuo large acanthomorphic acritarchs are older than the diverse Ediacaran assemblages found in Australia, Ukraine, northern Siberia and Newfoundland of Canada. Thus, the age of the Doushantuo Formation is earlier than the interval of early animal diversification marked by diverse Ediacaran biotas.
出处
《地层学杂志》
CSCD
北大核心
2001年第4期253-258,共6页
Journal of Stratigraphy
基金
科学技术部"九五"专项 ( 95 -专 -0 1-3-3
G99-A-0 5 a)
国家自然科学基金 ( No.49872 0 0 2 )
国家重点基础研究发展规划项目 ( G2 0 0 0 0 0 7770 0 )资助
