scholarly journals The methods and results of geochemical analyses of Cretaceous Colorado Group shales from the Western Canada Sedimentary Basin

1994 ◽  
Author(s):  
J Bloch
Keyword(s):  
Sedimentary Basin ◽  
Western Canada ◽  
Western Canada Sedimentary Basin ◽  
Colorado Group ◽  
Geochemical Analyses ◽  
Canada Sedimentary Basin

scholarly journals Significance and Distribution of Apatite in the Doig Phosphate Zone

2020 ◽  
Author(s):  
Pablo Lacerda Silva ◽  
R. Marc Bustin
Keyword(s):  
Electron Microscopy ◽  
Sedimentary Basin ◽  
Benthic Fauna ◽  
Western Canada ◽  
Western Canada Sedimentary Basin ◽  
Water Conditions ◽  
Oxygenated Water ◽  
Geochemical Analyses ◽  
Canada Sedimentary Basin ◽  
Scanning Electron

The Doig Phosphate Zone (DPZ) is a phosphate-bearing marine unit located at the base of the Doig Formation, in the Triassic section of the Western Canada Sedimentary Basin. The DPZ has a maximum thickness of 90 m and extends across northeastern British Columbia and western central Alberta. In this study we characterize the significance and interpret the origin of apatite in the DPZ, through mineralogical and geochemical analyses, thin section study and field emission-scanning electron microscopy. The occurrence of apatite in the DPZ is not evenly distributed, but restricted to discrete 10 to 20 cm thick beds, located near the base of the DPZ. Phosphorites are of two types: grainstones composed primarily of unconformity-bounded coated grains, and intraclastic phosphorites composed of detrital silt-sized grains and apatite coated grains in a cryptocrystalline phosphatic matrix. The phosphorite beds are records of stratigraphic condensation due to low detrital input during transgression. The erosionally-truncated phosphatic coated grains and intraclasts are interpreted to be a result of various phases of phosphatization, exhumation, erosion reworking, winnowing and redeposition in alternating quiescence and storms or bottom currents. The abundance of pyrite and chalcophile trace elements, as well as the low concentration of proxy elements for organic matter productivity and preservation, are further evidences of stratigraphic condensation, with sulfidic pore water development and extensive organic recycling promoted by biological activity during the long exposure times. The phosphorites were formed under oxygenated water conditions, as suggested by the depletion in Ce and presence of a diverse benthic fauna.

scholarly journals Significance and Distribution of Apatite in the Triassic Doig Phosphate Zone, Western Canada Sedimentary Basin

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 904
Author(s):  
Pablo Lacerda Silva ◽  
R. Marc Bustin
Keyword(s):  
Electron Microscopy ◽  
Sedimentary Basin ◽  
Benthic Fauna ◽  
Western Canada ◽  
Western Canada Sedimentary Basin ◽  
Water Conditions ◽  
Oxygenated Water ◽  
Geochemical Analyses ◽  
Canada Sedimentary Basin ◽  
Scanning Electron

The Doig Phosphate Zone (DPZ) is a phosphate-bearing marine unit located at the base of the Doig Formation, in the Triassic section of the Western Canada Sedimentary Basin. The DPZ has a maximum thickness of 90 m and extends across northeastern British Columbia and west-central Alberta. In this study, we characterize the significance and interpret the origin of apatite in the DPZ through mineralogical and geochemical analyses, thin section study, and field emission scanning electron microscopy. The occurrence of apatite in the DPZ is not evenly distributed but restricted to discrete 10 to 20 cm thick beds, located near the base of the DPZ. Phosphorites are of two types: grainstones composed primarily of unconformity-bounded coated grains, and intraclastic phosphorites composed of detrital silt-sized grains and apatite coated grains in a cryptocrystalline phosphatic matrix. The phosphorite beds are records of stratigraphic condensation due to low detrital input during transgression. The erosionally truncated phosphatic coated grains and intraclasts are interpreted to be a result of various phases of phosphatization, exhumation, erosion, reworking, winnowing, and redeposition in alternating quiescence and storms or bottom currents. The abundance of pyrite and chalcophile trace elements, as well as the low concentration of proxy elements for organic matter productivity and preservation, are further evidence of stratigraphic condensation, with sulfidic pore water development and extensive organic recycling promoted by biological activity during the long exposure times. The phosphorites were formed under oxygenated water conditions, as suggested by the depletion in Ce and the presence of a diverse benthic fauna.

Hydraulic Fracturing and Seismicity in the Western Canada Sedimentary Basin

2016 ◽  
Vol 87 (3) ◽  
pp. 631-647 ◽  
Author(s):  
Gail M. Atkinson ◽  
David W. Eaton ◽  
Hadi Ghofrani ◽  
Dan Walker ◽  
Burns Cheadle ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Sedimentary Basin ◽  
Western Canada ◽  
Western Canada Sedimentary Basin ◽  
Canada Sedimentary Basin
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