Author(s)

Akpofure Edirin ¹, Richard Peculiar Uboboizibe ¹

Affiliation(s)

¹ Department of Geology, Faculty of Science, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria

Corresponding Author

Akpofure Edirin

ABSTRACT

Ten samples of fine grained deposits that occur in Obogoro community, Bayelsa state, Nigeria, were subjected to qualitative analysis using XRD for whole rock analysis and Atterberg's Limit to determine the mineralogy and engineering properties of the deposits. The deposits are found to be made up of four major primary minerals, which are: quartz, ranging from 62% to 77%, with an average of 70%; orthoclase (K- feldspar), with a range of 7% to 15%, and an average of 11.5%; albite (plagioclase feldspar) is also one of the primary minerals that occur in the analyzed sediments. It has a range of 4% to 21%, and an average of 11.5%; and the white mica: muscovite with a range of 3% to 10%, and an average of 6.75%. Typical clay minerals were not observed but only the four primary minerals. This is attributed to incomplete weathering that may have been facilitated by mineral stability and geochemistry of the environment of deposition. The mineralogy depicts an acid igneous rock origin for the sediments. The Atterberg's Limit analysis shows that the Liquid Limits range from 32.7.0% to 57.6%, Plastic Limits range from 20.4% to 29.2% for five samples that passed the test; and the Plasticity Index ranges from 11.2 to 31.6 for the five samples that passed the Plastic Limit test. The analyzed samples fall above the A-Line of the Plasticity chart (CL) and <50% Liquid Limit divide line (ML), indicating that the fine grained deposits are silt to inorganic clays according to ASTM D2487 -11 derived from an acid igneous rock source.

KEYWORDS

Mineralogy, Weathering, Atterberg's Limit, Plasticity Index, Liquid Limit, Plastic Limit, Qualitative Analysis

CITE THIS PAPER

Akpofure Edirin, Richard Peculiar Uboboizibe, Qualitative Analysis of Fine Grained Deposits from Obogoro Community in Bayelsa State, Nigeria. Journal of Sedimentary Geology (2024) Vol. 2: 1-11. DOI: http://dx.doi.org/10.23977/sedig.2024.020101.

REFERENCES

[1] Allen, J.R.L. (1965) Late Quarternary Niger Delta and Adjacent Areas: Sedimentary Environment and Lithofacies. American Association Petroleum Geologist Bulletin, 49 (5): 549-600.
[2] ASTM D 4318 Test Methods for Liquid Limit, Plastic Limit and Plasticity Index
[3] ASTM D2487 -11 Standard Practices for Classification of Soils for Engineering Purpose (Unified Soil Classification System).
[4] Boggs, S. Jr. (2006) Principles of Sedimentology and Stratigraphy (4th Edition) Pearson Education Inc.  
[5] Krynine D.P and Judd W.R (2005)Principles of Engineering Geology and GeotechnicsMcGraw Hill Book Company Inc. New York, USA.CBS Publishers and Distributors PVT. Ltd.India.
[6] Pettijohn, F.J. (2004) Sedimentary Rocks (3rd Edition) CBS Publishers and Distributors, India.
[7] Plummer, C.C., McGeary, D. and Carlson, D.H. (2003) Physical Geology (9th Edition) McGraw-Hill Companies Inc.
[8] Read, H.H. (1984) Rutleys's Element of Mineralogy (26th Edition) Billing and Sons Ltd, London and Worcester.
[9] Turker, M. (1989) Techniques in Sedimentology, Blackwell Scientific Publications.
[10] Whiteman, A. J. (1982) Nigeria: Its Petroleum Geology, Resources and Potential. Vol 1 & 2. Graham and Trotman Ltd, Sterling House, 66 Wilson Road, London SWIV IDE.

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