Sulfur Isotopic Analysis and Sulfur Source Study of Phosphorite-associated Sulfate from the Ediacaran Doushantuo Formation in Guizhou Province

LI Xuanbo; WANG Ruimin; HUANG Tianzheng; SHUAI Gewei; SHEN Bing

doi:10.15898/j.cnki.11-2131/td.202202210026

2022 Vol. 41, No. 4

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LI Xuanbo, WANG Ruimin, HUANG Tianzheng, SHUAI Gewei, SHEN Bing. Sulfur Isotopic Analysis and Sulfur Source Study of Phosphorite-associated Sulfate from the Ediacaran Doushantuo Formation in Guizhou Province[J]. Rock and Mineral Analysis, 2022, 41(4): 531-540. doi: 10.15898/j.cnki.11-2131/td.202202210026

Citation:

LI Xuanbo, WANG Ruimin, HUANG Tianzheng, SHUAI Gewei, SHEN Bing. Sulfur Isotopic Analysis and Sulfur Source Study of Phosphorite-associated Sulfate from the Ediacaran Doushantuo Formation in Guizhou Province[J]. Rock and Mineral Analysis, 2022, 41(4): 531-540. doi: 10.15898/j.cnki.11-2131/td.202202210026

Sulfur Isotopic Analysis and Sulfur Source Study of Phosphorite-associated Sulfate from the Ediacaran Doushantuo Formation in Guizhou Province

Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University; School of Earth and Space Sciences, Peking University, Beijing 100871, China

More Information

Corresponding author: SHEN Bing, bingshen@pku.edu.cn

Received Date: 21 February 2022

Revised Date: 08 April 2022

Accepted Date: 29 April 2022

Publish Date: 28 July 2022

Abstract

Abstract

BACKGROUND
Phosphate deposit of the Ediacaran Doushantuo Formation in Guizhou province is a typical representative of the global phosphorite formation event in the late Neoproterozoic, which is closely related to climate change and evolution of life. However, the current research on the deposition of phosphorus deposits is limited to the mechanism of phosphorus formation and the source of phosphorus, and research on the phosphorus formation process of this deposit and its correlation with the paleo-ocean environment of the same period by isotopic geochemical indicators is relatively weak.
OBJECTIVES
In order to determine the sulfur source of phosphorite-associated sulfate.
METHODS
Based on the field section observation and the study of petrological characteristics under the microscope, elemental analyzer-isotope ratio mass spectrometry (EA-IRMS) was used to measure the sulfur isotopic composition of phosphorite-associated sulfate from the Ediacaran Doushantuo Formation. RESULTS: The sulfur isotopic composition of phosphorite-associated sulfate ranged from 32.7‰ to 36.9‰ (n=32, mean=34.1‰), which was 11‰ lower than that of the seawater of the same period, indicating that the phosphorite-associated sulfate was not all from the surface seawater.
CONCLUSIONS
The idealized early ocean (>520Ma) chemical zoning model indicates that there is a relatively ³⁴S-depleted H₂S zone in the seawater at the same time. Combined with the understanding that the source of phosphorus in the phosphorite is closely related to the upwelling, it can be considered that the sulfur isotopic composition of phosphorite-associated sulfate of the Doushantuo Formation represents the mixed signal of surface seawater and upwelling.
- elemental analyzer-isotope ratio mass spectrometry /
- phosphorite /
- sulfur isotope of phosphorite-associated sulfate /
- Doushantuo Formation /
- upwelling /
- H₂S zone

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References

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