Early Cambrian archaeocyathan zonation of the Yangtze Platform and their biostratigraphic implications
Early Cambrian archaeocyathan zonation of the Yangtze Platform and their biostratigraphic implications
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扬子地台早寒武世古细胞分带及其生物地层意义
DOI：
10.1017/s0016756815000333
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发表时间：
--
影响因子：
2.3
通讯作者：
Zhang Junming
中科院分区：
文献类型：
--
作者：
Yang Aihua;Zhu Maoyan;Andrey Zhuravlev;Yuan Kexing;Francoise Debrenne;Zhang Junming
摘要通过对华南下寒武统5个剖面古藻体分布的详细分析，建立了4个新的古藻体带和1个新的古藻体层。按年龄升序排列，分别是：秀奇日cyathus带；陕西双胞草带；螺旋藻双区；Sibirecyathus meitanensis山脉带；和太古草藻盐角层。这些新的细分允许在扬子地台（华南）区域内以及该区域与西伯利亚、澳大利亚、西欧和北美之间进行下寒武统地层的对比。在扬子地台区，与琼竹县期Eoredlichia三叶虫带中上段三叶虫共生的古虫有：Dailycyathus xiuqiensis和Dictyocyathus shaxiensis带。Spirillicyathus duplex和Sibirecyathus meitanensis Range带分别对应于沧朗泉期基部和中期的Malungia、Yiliangella-Yunnanaspis和Drepanuroides三叶虫带。最后，太古yathus yanjiaoensis地层属于沧浪滩上阶段的Palaeolenus fengyangensis三叶虫带。基于古藻组合带的全球对比表明：(1)华南琼竹县中上古藻与西伯利亚地台Atdabanian中期、南澳大利亚的Warriootacyathus wilkawillinensis古藻带、摩洛哥的Issendalenian中期和西班牙的Ovetian下古藻带相关；(2)华南最下沧朗川期与西伯利亚地台最上Atdabanian期、南澳spirillicythus tenuis - jugalicythus tardus古藓带、摩洛哥最上isendalenian - Banian期、西班牙Ovetian期中期和北美Montezuman期中期相关；(3)沧朗关中期与西伯利亚地台最下部的波托曼期、摩洛哥的巴尼亚期中期、西班牙的奥维梯-马里尼亚期上部和北美的蒙特祖曼期上部相接近；(4)上端沧朗川期相当于西伯利亚地台的托yonian中期、澳大利亚的Archaeocyathus abacus床、西班牙的Bilbilian中期和北美的Dyeran中期（Bolbolenellus euryparia Trilobite带）。
Abstract Detailed analysis of the distribution of archaeocyaths in five lower Cambrian sections in South China has resulted in the erection of four new archaeocyathan zones and one new archaeocyathan bed. Listed in order of ascending age, these are: the Dailycyathus xiuqiensis Zone; the Dictyocyathus shaanxiensis Zone; the Spirillicyathus duplex Range Zone; the Sibirecyathus meitanensis Range Zone; and the Archaeocyathus yanjiaoensis beds. These new subdivisions permit a correlation of lower Cambrian strata both within the area of the Yangtze Platform (South China) as well as between this region and Siberia, Australia, Western Europe and North America. Within the Yangtze Platform area, archaeocyaths of the Dailycyathus xiuqiensis and Dictyocyathus shaanxiensis zones co-occur with trilobites of the middle and upper Eoredlichia Trilobite Zone of the Qiongzhusian Stage. The Spirillicyathus duplex and the Sibirecyathus meitanensis Range Zone correspond to the Malungia, Yiliangella–Yunnanaspis and Drepanuroides Trilobite zones of the basal and middle Canglangpuan Stage, respectively. Finally, the Archaeocyathus yanjiaoensis beds belong to the Palaeolenus fengyangensis Trilobite Zone of the upper Canglangpuan Stage. Global correlations based on archaeocyath assemblage zones suggest that: (1) the middle–upper Qiongzhusian of South China correlates with the middle Atdabanian Stage of the Siberian Platform, the Warriootacyathus wilkawillinensis Archaeocyath Zone in South Australia, the middle Issendalenian Stage of Morocco and the lower Ovetian Stage in Spain; (2) the lowermost Canglangpuan Stage of South China correlates with the uppermost Atdabanian of the Siberian Platform, the Spirillicyathus tenuis – Jugalicyathus tardus archaeocyath zones in South Australia, the uppermost Issendalenian – lower Banian stages of Morocco, the middle Ovetian Stage of Spain and the middle Montezuman Stage of North America; (3) the middle Canglangpuan Stage approximates the lowermost Botoman Stage of the Siberian Platform, middle Banian Stage of Morocco, the uppermost Ovetian – lowermost Marianian stages of Spain and the upper Montezuman Stage of North America; (4) the uppermost Canglangpuan Stage is equivalent of the middle Toyonian Stage of the Siberian Platform, Archaeocyathus abacus beds in Australia, the middle Bilbilian Stage in Spain and the middle Dyeran Stage (Bolbolenellus euryparia Trilobite Zone) in North America.