Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China)

Yong Fu; Fuliang Wang; Chuan Guo; Chao Li; Peng Xia

doi:10.1007/s12583-021-1473-4

Volume 33 Issue 1

Feb 2022

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Journal of Earth Science > 2022 > 33(1): 25-35.

Yong Fu, Fuliang Wang, Chuan Guo, Chao Li, Peng Xia. Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China). Journal of Earth Science, 2022, 33(1): 25-35. doi: 10.1007/s12583-021-1473-4

Citation:

Yong Fu, Fuliang Wang, Chuan Guo, Chao Li, Peng Xia. Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China). Journal of Earth Science, 2022, 33(1): 25-35. doi: 10.1007/s12583-021-1473-4

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Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China)

doi: 10.1007/s12583-021-1473-4

Yong Fu^{1, 2
,
,
,},
Fuliang Wang^{1, 3},
Chuan Guo^{1, 2},
Chao Li⁴,
Peng Xia^{1, 2}

1.
College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
2.
Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China
3.
Guizhou Geological Environment Monitoring Institute, Guizhou 550081, China
4.
National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

Corresponding author: Yong Fu, byez1225@126.com
Received Date: 23 Dec 2020
Accepted Date: 20 Apr 2021
Publish Date: 28 Feb 2022

Abstract

Abstract

The Ediacaran-Cambrian (E-C) succession in South China records remarkable oceanic, biological and geochemical variations, but it was not well defined geochronologically, which hinders the interpretation of the spatio-temporal seawater chemical architecture during the time E-C interval. This study presents two Re-Os isochron ages of 520.2±6.1 and 561.7±8.5 Ma for the barite-rich black shales from the top Liuchapo and Doushantuo formations respectively in Tianzhu County, Guizhou Province. In combination with existing age data, the two new Re-Os isochron ages suggest that the Liuchapo Formation was deposited between 550 and 520 Ma. Moreover, like the polymetallic Ni-Mo-PGE layers of shelf margin (or platform) facies and V-rich horizons of transitional (or shelf slope) to deep-water facies, the barite deposits were likely formed due to differential mineralization. The timing offset likely resulted from differential elemental concentration related to certain local factors (i.e., hydrothermal fluids, seawater redox and biological activity). The isochron-derived initial ¹⁸⁷Os^/188Os ratios of the top Liuchapo Formation (0.902±0.048) and the Doushantuo Formation (0.740±0.042) fall within the range of continental weathering flux (1.54) and oceanic crust (0.126), implying the involvement of marine hydrothermal fluids. Moreover, their difference of initial ¹⁸⁷Os^/188Os ratios may reflect variations of continental weathering intensity and uplift magnitude.
- geochemistry,
- Ediacaran-Cambrian,
- initial ¹⁸⁷Os^/188Os,
- Liuchapo Formation,
- Re-Os isotope,
- Yangtze Block

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Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China)

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Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China)

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