Heavy mineral concentrations in the sandstones of Amij .
The heavy minerals were carried from the source area by northward moving rivers and sorted out by ocean waves as black sand concentrations at the delta mouth along the southern beaches of the Neo-Tethys Ocean under passive margin tectonic setting. This border was apparently bordering the current western part of Iraq during Upper Jurassic period.
Element Concentrations in Soils and Other Surfici 1Materials .
The lower concentrations of some elements notably aluminum barium calcium magnesium potassium sodium and strontium in most samples of surficial materials from the Eastern United States and the greater abundance of heavy metals in the same materials of the Western United States indi es a regional geochemical pat-
Chapter 20 Heavy Mineral Concentration in Modern Sands .
Heavy mineral concentration in sediments depends primarily on the chemistry and tectono-stratigraphic level of rocks eroded within continental-block arc or orogenic source terranes.
Heavy-Mineral Sand Resources in the Southeastern U.S.
“Heavy-mineral sands" HMS is a term commonly used in industry and geologic literature to describe layered sediments deposited in coastal environments that contain dense “heavy" minerals of economic value.
HEAVY-MINERAL CONCENTRATIONS ASSOCIATED WITH SOME GAMMA-RAY .
Heavy-mineral concentrations and their mineralogy were characterized for twenty samples from four sites in Creta ceous and younger sediments of the inner Coastal Plain of North Carolina. The sites were near the peaks of indivi dual gamma-ray anomalies high values shown by aeroradiometric surveys.
Heavy mineral sands ore deposits - Wikipedia
Heavy mineral sands are placer deposits formed most usually in beach environments by concentration due to the specific gravity of the mineral grains. It is equally likely that some concentrations of heavy minerals aside from the usual gold placers exist within streambeds but most are of a low grade and are relatively small.
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