34S-enriched sulphate in the Belcher Group, N.W.T., Canada: evidence for dissimilatory sulphate reduction in the early Proterozoic ocean

Akira Ueda; Eion M. Cameron; H. Roy Krouse

doi:10.1016/0301-9268(91)90034-8

³⁴S-enriched sulphate in the Belcher Group, N.W.T., Canada: evidence for dissimilatory sulphate reduction in the early Proterozoic ocean

Akira Ueda^*, Eion M. Cameron, H. Roy Krouse

^*Corresponding author for this work

Faculty of Science

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Sulphate molds and halite casts have been reported from a dolomite-mudstone sequence near the base of the ∼ 1.9 Ga Belcher Group (Bell and Jackson, 1974). By the in vacuo Kiba technique (Ueda and Sakai, 1983) we have obtained δ³⁴S values for trace amounts of sulphate and sulphide in three samples of dolomite containing sulphate molds from the Kasegalik Formation. For sulphate, the δ³⁴S values are +26.9א to +28.9א, averaging 27.8א, and are independent of sulphate concentration (37 p.p.m. to 584 p.p.m.) and the sulphide/sulphate ratio. The δ³⁴S values are considered to represent the composition of seawater in which the sediments were deposited. This adds to the fragmentary record of the isotopic composition of early Proterozoic seawater.

Original language	English
Pages (from-to)	229-233
Number of pages	5
Journal	Precambrian Research
Volume	49
Issue number	3-4
DOIs	https://doi.org/10.1016/0301-9268(91)90034-8
State	Published - 1991/02

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1016/0301-9268(91)90034-8

Cite this

@article{f5f54c9d7eb047ecaf7f777694af9665,

title = "34S-enriched sulphate in the Belcher Group, N.W.T., Canada: evidence for dissimilatory sulphate reduction in the early Proterozoic ocean",

abstract = "Sulphate molds and halite casts have been reported from a dolomite-mudstone sequence near the base of the ∼ 1.9 Ga Belcher Group (Bell and Jackson, 1974). By the in vacuo Kiba technique (Ueda and Sakai, 1983) we have obtained δ34S values for trace amounts of sulphate and sulphide in three samples of dolomite containing sulphate molds from the Kasegalik Formation. For sulphate, the δ34S values are +26.9א to +28.9א, averaging 27.8א, and are independent of sulphate concentration (37 p.p.m. to 584 p.p.m.) and the sulphide/sulphate ratio. The δ34S values are considered to represent the composition of seawater in which the sediments were deposited. This adds to the fragmentary record of the isotopic composition of early Proterozoic seawater.",

author = "Akira Ueda and Cameron, {Eion M.} and {Roy Krouse}, H.",

year = "1991",

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doi = "10.1016/0301-9268(91)90034-8",

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journal = "Precambrian Research",

issn = "0301-9268",

publisher = "Elsevier B.V.",

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T1 - 34S-enriched sulphate in the Belcher Group, N.W.T., Canada

T2 - evidence for dissimilatory sulphate reduction in the early Proterozoic ocean

AU - Ueda, Akira

AU - Cameron, Eion M.

AU - Roy Krouse, H.

PY - 1991/2

Y1 - 1991/2

N2 - Sulphate molds and halite casts have been reported from a dolomite-mudstone sequence near the base of the ∼ 1.9 Ga Belcher Group (Bell and Jackson, 1974). By the in vacuo Kiba technique (Ueda and Sakai, 1983) we have obtained δ34S values for trace amounts of sulphate and sulphide in three samples of dolomite containing sulphate molds from the Kasegalik Formation. For sulphate, the δ34S values are +26.9א to +28.9א, averaging 27.8א, and are independent of sulphate concentration (37 p.p.m. to 584 p.p.m.) and the sulphide/sulphate ratio. The δ34S values are considered to represent the composition of seawater in which the sediments were deposited. This adds to the fragmentary record of the isotopic composition of early Proterozoic seawater.

AB - Sulphate molds and halite casts have been reported from a dolomite-mudstone sequence near the base of the ∼ 1.9 Ga Belcher Group (Bell and Jackson, 1974). By the in vacuo Kiba technique (Ueda and Sakai, 1983) we have obtained δ34S values for trace amounts of sulphate and sulphide in three samples of dolomite containing sulphate molds from the Kasegalik Formation. For sulphate, the δ34S values are +26.9א to +28.9א, averaging 27.8א, and are independent of sulphate concentration (37 p.p.m. to 584 p.p.m.) and the sulphide/sulphate ratio. The δ34S values are considered to represent the composition of seawater in which the sediments were deposited. This adds to the fragmentary record of the isotopic composition of early Proterozoic seawater.

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