摘要
湖南慈利康家坪长兴组礁相地层上直接覆以大冶组"错时相"钙质微生物岩、鲕状灰岩、蠕虫状灰岩等沉积物。岩相、生物地层和碳同位素演变表明大灭绝事件处地层连续;剖面上长兴期末的化石分布呈现一种单幕式灭绝型式和过程;占据大灭绝后浅水碳酸盐相的是一种以微生物主导的"异常生态系"。
The reef facies of the Changxing Formation is overlaid by the ＂anachronistic facies＂ such as calcimicrobialite,oolitic limestone and vermicular limestone of the Daye Formation at Kajiaping section,Cili area,Hunan Province.The lithology,biostratigraphy and carbon isotope excursion of those reef facies indicate that the sequence is continuous across the mass extinction boundary.The distribution of fossils in the latest Changhsingian at the section shows a single-episode pattern and process of mass extinction.The shallow carbonate facies was occupied by a ＂abnormal ecosystem＂ dominated by microbes in the aftermath of mass extinction.
出处
《华南地质与矿产》
CAS
2010年第3期51-56,共6页
Geology and Mineral Resources of South China
基金
国家自然科学基金项目(编号:40830212
40921062)资助
