Geochemistry of approximately 1.9 Ga sedimentary rocks from northeastern Labrador, Canada

Fifty-eight rock chips from fifteen samples of sedimentary rocks from the Ramah Group (approximately 1.9 Ga) in northeastern Labrador, Canada, were analyzed for major and minor elements, including C and S, to elucidate weathering processes on the Earth's surface about 1.9 Ga ago. The samples co...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 1997, Vol.61 (19), p.4115-4137
Main Authors: Hayashi, K. I., Fujisawa, H., Holland, H. D., Ohmoto, H.
Format: Article
Language:English
Subjects:
Atmosphere - chemistry
Earth (Planet)
Evolution, Planetary
Geologic Sediments - analysis
Geologic Sediments - chemistry
Geology - methods
Geosciences (General)
Minerals - analysis
Newfoundland and Labrador
Oxygen - analysis
Paleontology
Space life sciences
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Summary:Fifty-eight rock chips from fifteen samples of sedimentary rocks from the Ramah Group (approximately 1.9 Ga) in northeastern Labrador, Canada, were analyzed for major and minor elements, including C and S, to elucidate weathering processes on the Earth's surface about 1.9 Ga ago. The samples come from the Rowsell Harbour, Reddick Bight, and Nullataktok Formations. Two rock series, graywackes-gray shales of the Rowsell Harbour, Reddick Bight and Nullataktok Formations, and black shales of the Nullataktok Formation, are distinguishable on the basis of lithology, mineralogy, and major and trace element chemistry. The black shales show lower concentrations than the graywackes-gray shales in TiO2 (0.3-0.7 wt% vs. 0.7-1.8 wt%), Al2O3 (9.5-20.1 wt% vs. 13.0-25.0 wt%), and sigma Fe (
ISSN:0016-7037
1872-9533
DOI:10.1016/S0016-7037(97)00214-7