The Cretaceous - Tertiary Clastic Rocks Weathering Indices: A case Study Of Maastrichtian?- Paleocene Rock
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 2, Issue 2
Abstract
A total number of 210 ditch cuttings samples of carbonaceous shale, sandstones and mudstones of Maastrichtian? Paleocene sequence from Mushe , Sa, Tuma and Ziye wells from Bornu Basin were considered for this study. The intention was to understand the paleo-weathering history of the sediment detail lithological and bulk geochemical analyses using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The data from these analyses were evaluated using four common silicate weathering indices; Alteration (CIA), Plagioclase Index of Alteration (PIA), Chemical Index of Weathering (CIW) and Ruxton Ratio (RR). Theseallowedfor a proper interpretation of weathering trends in reconnaissance samples from the study area. The lithologic study showed a basin dominated by argillaceous and arenaceous sediments deposited in fluvio to lagoonal settings. The results from weathering indices for Mushe, Sa, Tuma and Ziyeare CIA =79.4, 75.5, 88.7 and 82.4%;CIW=82.1, 78.2, 92.2 and 84.8%;PIA respectively. The above results suggest that the weathering indices ( using CIW, CIA, PIA and RR) revealed sediments subjected to short transportation, intense mechanical weathering at the source
Authors and Affiliations
Olubunmi C. Adeigbe
Keywords
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