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अमूर्त

Paleo Environmental Studies for Stream Sediments around Awe-Obi Area North Central Nigeria

Gajere JN, Abaa SI and Kana JE

A stream’s sediment load is typically deposited, eroded, and redeposited many times in a stream channel, especially during climatic variations such as flooding. During this process of deposition, erosion and redeposition the chemistry of stream sediments changes. Understanding the past environmental conditions under which these sediments have been subjected to are of great significance to geologist interested in exploring for mineral and petroleum resources. Paleo Environmental studies conducted on 17 stream sediment samples in parts of Awe-Obi area using chemical index of alteration (CIA) and chemical index of weathering (CIW) revealed that the area is intense to extremely weathered with calculated values between 67 and 99. The mineralogical index of alteration (MIA) was studied to evaluate the degree of mineralogical weathering. The calculated values revealed that Awe-Obi is intermediate, intense-extremely weathered. Index of compositional variability (ICV) was used in this study as measure of sediment maturity. The calculated ICV values showed all the samples as immature except sample SSB8 which has a value of 0.765515. Paleo-Oxygenation condition of the study area was conducted using Ni/Co ratio. This revealed that all the samples were deposited in an oxygenated condition.