华南埃迪卡拉(震旦)系顶部地层划分及与寒武系界线FAD分子的选择
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中国地质科学院地质研究所,四川博物院,四川省207地质队,南京大学地球科学与工程学院,中国地质科学院地质研究所,四川省207地质队,中国地质科学院地质研究所

基金项目:

(编号41572024);中国地质学院地质研究所基本科研业务费项目(编号YYWF201602)资助的成果。收稿日期:2016-11-20第一作者:顾鹏,男,1992年生。硕士研究生在读,古生物地层学。Email:996806588@qq.com通讯作者:唐烽,男,1965年生,研究员,主要从事地层学及古生物学方面的研究。Email:tangfeng@cags.ac.cn


The Division of the Late EdiacaranCambrian Boundary Interval Stratigraphy and New Options of Index Fossil FAD in South China
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Insititute of Geology, Chinese Academy of Geological Sciences,Sichuan Museum,Sichuan Geological Prospecting Bureau 207 teams,School of Earth Sciences and Engineer, Nanjing University,Insititute of Geology, Chinese Academy of Geological Sciences,Sichuan Geological Prospecting Bureau 207 teams,Insititute of Geological, Chinese Academy of Geological Sciences

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    摘要:

    “雪球事件”以来,早期生命呈现多层次、大规模的加速演化,到寒武纪前夕,生命大爆发达到高潮;在生命剧烈演替的同时,地球环境标志也发生着响应,碳同位素剧烈漂移,并且与各个生命演化节点相对应。但是在划分最重要的地质界线,埃迪卡拉(震旦)系——寒武系界线及界线层型和点位(“金钉子”,GSSP)确立的问题上迄今仍存在着较大的分歧,以遗迹化石Treptichnus pedum作为该GSSP的标志化石,因其跨系、跨阶产出,生物延限长,因而在全球的生物地层划分对比中(特别在西伯利亚和中国华南地区)一直质疑声不断,而且以遗迹化石作为标志化石本身也具有一定的缺陷。中国华南地区两类古老的宏体化石——矿化管状的Cloudina和条带状的Shaanxilithes在全球范围内可以很好的对比,并且这两种实体化石的出现都对应着碳同位素的明显正漂移。本文通过研究华南震旦系顶部化石带的地层分布和地理分布,综合分析了其时空分布特点和系统演化意义,深入探讨了Cloudina和Shaanxilithes作为寒武系底界标志化石所具备的潜力,对埃迪卡拉(震旦)纪—寒武纪地层界线划分和层型选择提出了更为理想的标准。

    Abstract:

    Since the “Snowball Event”, the early life has presented a multilevel, massive evolution, and reached its climax before the eve of the Cambrian. Accompanied the dramatic succession of life, the environment sign of the Earth changed and carbon isotope also shifted dramatically, both of which corresponded to the each stage of life succession. However, a big difference still occurs in the division of the most important geological boundaries, PrecambrianCambrian stratotype section and point (“Golden Nail”, GSSP). Treptichnus pedum as a marker fossil of the GSSP has been questioned constantly in the global biostratigraphic division (especially in Siberia and South China), partially due to the fact that remains of trace fossils as a symbol also has certain defects. The earliest skeletal fossil Cloudina and the body fossil Shaanxilithes in South China can be well compared on a global scale, and the appearance of these two fossils corresponds to significant positive excursions of carbon isotope. By studying the stratigraphic distribution and geographical distribution characteristics of the fossil zone, this paper analyzes the spatiotemporal features and evolutional significance of the system, and discusses the potentials of Cloudina and Shaanxilithe as markers of Cambrian bottom. Finally, a more ideal standard is proposed to determine the PrecambrianCambrian boundary.

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引用本文

顾鹏,钟玲,张国栋,宋思存,唐烽,凌茂前,高林志.2018.华南埃迪卡拉(震旦)系顶部地层划分及与寒武系界线FAD分子的选择[J].地质学报,92(3):449-465.
GU Peng, ZHONG Ling, ZHANG Guodong, SONG Sicun, TANG Feng, LING Maoqian, GAO Linzhi.2018. The Division of the Late EdiacaranCambrian Boundary Interval Stratigraphy and New Options of Index Fossil FAD in South China[J]. Acta Geologica Sinica,92(3):449-465.

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历史
  • 收稿日期:2017-03-23
  • 最后修改日期:2017-09-27
  • 录用日期:2018-03-19
  • 在线发布日期: 2018-03-19