scholarly journals Origin and distribution of six heavy-mineral placer deposits in coastal-marine sandstones in the Upper Cretaceous McCourt Sandstone Tongue of the Rock Springs Formation, southwest Wyoming

10.3133/b1867 ◽  
1989 ◽  
Keyword(s):  
Upper Cretaceous ◽  
Heavy Mineral ◽  
Coastal Marine ◽  
Placer Deposits ◽  
Rock Springs

scholarly journals Sedimentologic, Heavy Mineral and Provenance Studies of the Cretaceous Sediments in the Auchi Area of the Anambra Basin

2020 ◽  
Vol 24 (6) ◽  
pp. 955-959
Author(s):  
O.A. Ilegieuno ◽  
E.J. Ighodaro ◽  
R.O. Sunny
Keyword(s):  
Upper Cretaceous ◽  
Heavy Mineral ◽  
Coarse Grained ◽  
Metamorphic Rocks ◽  
Basement Complex ◽  
Provenance Studies ◽  
Anambra Basin ◽  
Edo State ◽  
Sand Particles ◽  
Cretaceous Deposits

The Upper Cretaceous Deposits of the Anambra Basin has a part of its sedimentary rock deposited in the Auchi area of Edo State. Geologic field and Sedimentological studies carried out on twenty eight (28) selected samples from a section of a road–cut show that the sediments range from fine through medium to coarse grained. Morphoscopic studies reveal subangular to subrounded outline of sand particles. These coupled with the  various colours observed in the sediment, ranging from whitish sand through yellowish brown, pink and reddish brown possibly indicate a non–marine environment and a fluviatile to deltaic environment of sedimentation is suggested. Heavy mineral assemblage made up mainly of opaque, andalusite, zircon, hornblend, sphene and epidote suggest derivation from the Precambrian Igneous and medium to high grade metamorphic rocks of the underlying Basement Complex of Nigeria. Keywords: Sedimentology, Cretaceous, Morphoscopic, Heavy Mineral, Provenance

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