全球寒武系第4阶国际层型剖面及点位(GSSP)研究的进展

Progress on the Study of Cambrian Stage 4 Global Stratotype Section and Point(GSSP)

赵元龙研究团队以贵州剑河交榜杷榔组剖面为依据,结合其下变马冲组及其上“清虚洞组”于2010年起进行了长达10多年的寒武系第4阶地层、层序地层、碳硫同位素等学科的研究,取得了明显的进展,建立了3个三叶虫带及1个三叶虫层位、2个疑源类组合带,初步确定首现于杷榔组底部的Oryctocerella duyunensis为第4阶首现三叶虫。疑源类、碳硫同位素等变化曲线与此基本一致。并与北格林兰Henson Gletscher地层进行了对比,将视剑河交榜杷榔组剖面为潜在的寒武系第4阶国际层型剖面及点位(GSSP),将继续进行深入研究。

Mainly based on Balang formation occurring in Jiaobang section,Jianhe county,Guizhou province,with lower Bianmachong formation and upper Tsinghsutang Formation considered,the research on Cambrian series 4 has been carried out for more than 10 years(since 2010)by the research team led by Zhao Yuan-long,with multidisciplinary knowledge on sequence stratigraphy and Carbon sulfur isotope related.Notable progress has been achieved so far,including the confirmation for 3 trilobites belt and 1 trilobite stratigraphic position and the establishment of 2 acritarch assemblage zones.Additionally,Oryctocerella duyunensis,firstly appearing at the bottom of Balang Formation,was identified as the FAD(First appearance datum)for Stage 4.Also,the variation curve of carbon and sulfur isotope is nearly consistent with that of acritarch.And we take other places like North Greenland into comparison.The Balang Formation occurring in Jiaobang section,Jianhe County is taken as the potential Global Stratotype Section and point(GSSP)for Cambrian stage 4.Therefore further research is need to be conducted.