| 湖北宜昌滚子坳剖面寒武系幸运阶顶底界线 |
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| 引用本文： | 潘时妹,冯庆来.湖北宜昌滚子坳剖面寒武系幸运阶顶底界线[J].地球科学,2021,46(1):136-147. |
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| 作者姓名： | 潘时妹 冯庆来 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉 430074;广东省佛山地质局,广东佛山 528000;中国地质大学地球科学学院,湖北武汉 430074;中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉 430074;中国地质大学地球科学学院,湖北武汉 430074 |
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| 基金项目： | 国家自然科学重点项目"放射虫的起源、早期演化及其环境背景研究" |
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| 摘 要： | 对湖北宜昌地区滚子坳剖面寒武系纽芬兰统幸运阶顶底界线的位置进行较为细致的研究.通过切片法及酸蚀法对61个样品进行系统处理，获得了大量的小壳化石、疑源类化石及其他分类位置未定化石.系统鉴定和描述了23属44种.根据具刺疑源类化石Asteridium和小壳化石Protohertzina sp.的首现位置以及无机碳同位素BACE曲线最大负值位置可以推断出埃迪卡拉系-寒武系界线应该位于第1层底部往上约10.5 m处；根据Zhijinites longistriatus的首现位置以及无机碳同位素ZHUCE曲线最大值位置可以推断出幸运阶与第二阶的界线位置大致为第4层底部往上约2.78 m.此外，还将峡东地区的小壳化石Ⅱ带和Ⅲ带重新定义，即将Purella antiqua组合（Zone Ⅱ）修订为Purella antiqua-Siphogonuchites triangularis组合；将Aldanella yanjiahensis组合（Zone Ⅲ）修订为Aldanella yanjiahensis-Zhijiniteslongistriatus组合.
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| 关 键 词： | 寒武系 幸运阶第二阶 小壳化石带 AHC 化石组合 滚子坳剖面 |
| 收稿时间： | 2020-11-27 |
Lower and Upper Boundaries of Fortunian from Yichang,Hubei, China |
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| Pan Shimei,Feng Qinglai.Lower and Upper Boundaries of Fortunian from Yichang,Hubei, China[J].Earth Science-Journal of China University of Geosciences,2021,46(1):136-147. |
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| Authors: | Pan Shimei Feng Qinglai |
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| Institution: | (State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China;Foshan Geological Bureau of Guangdong Province,Foshan 528000,China;Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China) |
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| Abstract: | This paper is focused on the base of the Fortunian and Cambrian Stage 2 in the Gunziao section of Yichang, Hubei province. Thousands of SSFs has been found by dealing with 61 samples, 23 genera and 44 species to be identified and described. Additionally, some conclusions are drawn as follows. According to the first appearance datum of Asteridium and Protohertzina sp., and the large negative carbon isotope anomaly (BACE), the base of the Fortunian should be located at 10.5 meters above the Beds 1. According to the first appearance datum of Zhijinites longistriatus and the large positive carbon isotope anomaly (ZHUCE), it can be inferred that the base of Stage 2 is approximately 2.78 meters above the Beds 4. Purella antiqua Assemblage Zone (ZoneⅡ) and Aldanella yanjiahensis Assemblage Zone (ZoneⅢ) in Three Gorge area are redefined based on the new data, which is to be Purella antiqua-Siphogonuchites triangularis Assemblage Zone and Aldanella yanjiahensis-Zhijinites longistriatus Assemblage Zone. |
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| Keywords: | Cambrian Fortunian Stage 2 small shelly fossils AHC assemblage zone Gunziao section |
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