TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=0025995187&partnerID=8YFLogxK
U2 - 10.1016/0301-9268(91)90034-8
DO - 10.1016/0301-9268(91)90034-8
M3 - 学術論文
AN - SCOPUS:0025995187
SN - 0301-9268
VL - 49
SP - 229
EP - 233
JO - Precambrian Research
JF - Precambrian Research
IS - 3-4
ER -