Constraints on the Ediacaran-Cambrian boundary in deep-water realm in South China: Evidence from zircon CA-ID-TIMS U-Pb ages from the topmost Liuchapo Formation
Constraints on the Ediacaran-Cambrian boundary in deep-water realm in South China: Evidence from zircon CA-ID-TIMS U-Pb ages from the topmost Liuchapo Formation
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华南深水区埃迪卡拉系-寒武系边界的制约——来自六岔坡组顶部锆石CA-ID-TIMS U-Pb年龄的证据
DOI：
10.1007/s11430-019-9590-0
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发表时间：
2020-03
期刊：
影响因子：
--
通讯作者：
Guo Jinghui
中科院分区：
文献类型：
--
作者：
Wang Wei;Zhou Mingzhong;Chu Zhuyin;Xu Junjie;Li Chaofeng;Luo Taiyi;Guo Jinghui
华南深水区埃迪卡拉-寒武系界线的位置和埃迪卡拉-寒武系过渡期的高精度时间格架尚未完全解决。最近，在贵州平阴剖面六岔坡组顶部发现了两层钾质膨润土。这为建立华南扬子地台过渡地层的时间格架和确定埃迪卡拉-寒武系界线提供了契机。本文对两个钾镁矾中的锆石进行了高精度CA-ID-TIMS U-Pb定年。两个钾镁矾的年龄分别为536.40±0.47/1.1/1.2Ma（2σ，n=7，MSWD=0.92）和541.48±0.46/1.1/1.2Ma（2σ，n=8，MSWD=1.3）。结合该剖面柳茶坡组顶部硅质岩的有机碳同位素数据，我们认为Ediacaran寒武系界线应与两种钾镁矾岩有机碳同位素的显著负偏移相一致。埃迪卡拉-寒武纪界线方案的提出，对全球对比，进一步揭示埃迪卡拉末期-早寒武世海洋信息具有重要意义。
The placement of the Ediacaran-Cambrian boundary in deep-water realm in South China and the high-precision temporal framework for the Ediacaran-Cambrian transition in this region have not yet been completely solved. Recently, we have found two K-bentonite beds in the top of the Liuchapo Formation at the Pingyin section, Guizhou Province. It provides an opportunity for constructing the temporal framework of the transitional strata on the Yangtze Platform in South China and for determining the Ediacaran-Cambrian boundary in this area. In this study, we conducted high-precision CA-ID-TIMS U-Pb dating on zircons from the two K-bentonites. The ages of the two K-bentonites were precisely constrained at 536.40±0.47/1.1/1.2 Ma (2σ,n=7, MSWD=0.92) and 541.48±0.46/1.1/1.2 Ma (2σ,n=8, MSWD=1.3). Combining the geochronological results with organic carbon isotope data of chert in the topmost Liuchapo Formation from the section, we suggest that the EdiacaranCambrian boundary should be consistent with a significant negative organic carbon isotope excursion between the two K-bentonites. The scheme of the Ediacaran-Cambrian boundary in this study is of great significance for global correlation, and further for unravelling the information of the terminal Ediacaran-early Cambrian ocean.
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影响因子：
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作者：
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影响因子：
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