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

Rock and Mineral Analysis > 2022 > 41(4): 531-540. > DOI: 10.15898/j.cnki.11-2131/td.202202210026

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

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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

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Received Date: February 20, 2022
Revised Date: April 07, 2022
Accepted Date: April 28, 2022
Available Online: September 08, 2022

Abstract

HIGHLIGHTS
(1) The sulfur isotopic composition of phosphorite-associated sulfate of the Doushantuo Formation ranged from 32.7‰ to 36.9‰ by elemental analyzer-isotope ratio mass spectrometry. Compared with the sulfur composition of seawater in the same period, it shows that the sulfur in the phosphate rock does not all come from the surface seawater.

(2) The early oceans (>520Ma) chemical zonation model indicated that sulfur of phosphorite came from the H₂S zone.

(3) The sulfur isotopic composition of phosphorite-associated sulfate was lower than that of the contemporaneous seawater, representing a mixed signal of upwelling and surface seawater, which can be a new indicator of sulfur isotope of sulfate in seawater.

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.

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References (47)

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

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