SIMS U-Pb Zircon Geochronological and Carbon Isotope Chemostratigraphic Constraints on the Ediacaran-Cambrian Boundary Succession in the Three Gorges Area, South China

Taiyu Huang; Daizhao Chen; Yi Ding; Xiqiang Zhou; Gongjing Zhang

doi:10.1007/s12583-019-1233-x

Volume 31 Issue 1

Jan 2020

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Journal of Earth Science > 2020 > 31(1): 69-78.

Taiyu Huang, Daizhao Chen, Yi Ding, Xiqiang Zhou, Gongjing Zhang. SIMS U-Pb Zircon Geochronological and Carbon Isotope Chemostratigraphic Constraints on the Ediacaran-Cambrian Boundary Succession in the Three Gorges Area, South China. Journal of Earth Science, 2020, 31(1): 69-78. doi: 10.1007/s12583-019-1233-x

Citation:

Taiyu Huang, Daizhao Chen, Yi Ding, Xiqiang Zhou, Gongjing Zhang. SIMS U-Pb Zircon Geochronological and Carbon Isotope Chemostratigraphic Constraints on the Ediacaran-Cambrian Boundary Succession in the Three Gorges Area, South China. Journal of Earth Science, 2020, 31(1): 69-78. doi: 10.1007/s12583-019-1233-x

Citation:

Taiyu Huang, Daizhao Chen, Yi Ding, Xiqiang Zhou, Gongjing Zhang. SIMS U-Pb Zircon Geochronological and Carbon Isotope Chemostratigraphic Constraints on the Ediacaran-Cambrian Boundary Succession in the Three Gorges Area, South China. Journal of Earth Science, 2020, 31(1): 69-78. doi: 10.1007/s12583-019-1233-x

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SIMS U-Pb Zircon Geochronological and Carbon Isotope Chemostratigraphic Constraints on the Ediacaran-Cambrian Boundary Succession in the Three Gorges Area, South China

doi: 10.1007/s12583-019-1233-x

Taiyu Huang^{1,2,3
,},
Daizhao Chen^{1,2,3
,
,
,},
Yi Ding^1,2,3,4,
Xiqiang Zhou^1,2,3,
Gongjing Zhang^1,2,3

1.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Institution of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
4.
Post-Doctoral Research Station of Geological Resource and Geological Engineering, Chengdu University of Technology, Chengdu 610059, China

More Information

Corresponding author: Daizhao Chen
Received Date: 11 Feb 2019
Accepted Date: 01 Jul 2019
Publish Date: 01 Feb 2020

Abstract

Abstract

The Ediacaran-Cambrian succession in South China records dramatic biological,oceanic and geochemical changes,but it is not well constrained geochronologically. This study reports a new SIMS U-Pb date of 543.4±3.5 Ma (MSWD=1.2) from a tuffaceous layer in the Zhoujiaao Section,and carbonate C-O isotopes in both Zhoujiaao and Sixi sections,Three Gorges area. This tuffaceous layer is present in the Upper Dengying Formation (i.e.,the Baimatuo Member) which is characterized by a stable δ¹³C_carb plateau and the beginning of a negative δ¹³C_carb shift near its upper boundary. In accordance with the existing biostratigraphic and chemostratigraphic data,this new date corroborates that the upper boundary of the Dengying Formation in South China is approximately equivalent to the Ediacaran-Cambrian boundary (ca. 541 Ma). This age also provides the minimum age of the last appearance of the Shibantan biota in the Three Gorges area,indicating that the terminal Ediacaran index fossils (e.g.,Cloudina,Sinotubulites) are not reliable stratigraphic markers for further subdivision of the uppermost Ediacaran.
- U-Pb dating,
- carbon isotope chemostratigraphy,
- Dengying Formation,
- Ediacaran-Cambrian boundary,
- Three Gorges area,
- Shibantan biota,
- geochemistry

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