best magazine for ias preparation

 best magazine for ias preparation

Wyomings Geology Potential for U.S. Utilities 

best magazine for ias preparation Boberg explained the development of the roll-fronts, writing, “Fluid flow through the very porous and permeable sediments would be relatively fast allowing for the development of large oxidized tongues with the young sediment as well as scattered uranium deposits at the redox (oxidized reduction) interface within approximately a million years. Deposits formed near the granitic highlands would be larger and of higher average grade because of the proximity to the dual source of granite and ash. pratiyogita darpan pdf  ” J.D. Loves uranium discovery in Tertiary sandstones, in 1951, was a near-surface roll-front type of redox deposit. A roll-front deposit follows a sinuous linear trend, often C-shaped. Colorado and Utah miners began calling the cross-sectional configuration a “roll” in the early 1940s. Roll-fronts occur in sandstones, bordered above and below by less permeable shales. pratiyogita darpan in hindi  In Wyoming, the “rolls” are bordered by altered and unaltered sandstone. It is generally concave from altered ground and convex into unaltered ground. Harris idealized roll-front uranium deposit would have “uranium concentrations decrease abruptly away from the concave boundary, and concentrations gradually decrease away from the convex boundary in reduced rock.” Uranium is not always present everywhere along a roll front. pratiyogita darpan online  It may be unevenly distributed and there are often other elements, such as vanadium, selenium, molybdenum, copper, silver, lead and zinc. Geologists look for where coarse-grained sandstones grade into finer grained or clay-bearing equivalents as indicators for uranium ore. As uranium geologists know with roll-front deposits, it may be mined as long as it is below the water table. Once deposits are brought above the water table, the uranium concentration can be eroded and severely modified pratiyogita darpan yearbook 2016 .