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This article has been retracted at the request of the author as it is based on the study that was carried out by the author’s M.S. supervisor, Dr. Matthew E. Nton, who did not consent to the publication of this work.

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  1. O. A. Odundun, “Use of geochemical fossils as indicators of thermal maturation: an example from the Anambra Basin, Southeastern Nigeria,” Journal of Geochemistry, vol. 2015, Article ID 809780, 11 pages, 2015.
Journal of Geochemistry
Volume 2015, Article ID 809780, 11 pages
Research Article

Use of Geochemical Fossils as Indicators of Thermal Maturation: An Example from the Anambra Basin, Southeastern Nigeria

Department of Earth Sciences, Adekunle Ajasin University, Akungba Akoko, Ondo State, Nigeria

Received 28 April 2014; Revised 31 August 2014; Accepted 1 September 2014

Academic Editor: Franco Tassi

Copyright © 2015 Olumuyiwa Adedotun Odundun. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Organic geochemical studies and fossil molecules distribution results have been employed in characterizing subsurface sediments from some sections of Anambra Basin, southeastern Nigeria. The total organic carbon (TOC) and soluble organic matter (SOM) are in the range of 1.61 to 69.51 wt% and 250.1 to 4095.2 ppm, respectively, implying that the source rocks are moderately to fairly rich in organic matter. Based on data of the paper, the organic matter is interpreted as Type III (gas prone) with little oil. The geochemical fossils and chemical compositions suggest immature to marginally mature status for the sediments, with methyl phenanthrene index (MPI-1) and methyl dibenzothiopene ratio (MDR) showing ranges of 0.14–0.76 and 0.99–4.21, respectively. The abundance of 1,2,5-TMN (Trimethyl naphthalene) in the sediments suggests a significant land plant contribution to the organic matter. The pristane/phytane ratio values of 7.2–8.9 also point to terrestrial organic input under oxic conditions. However, the presence of C27 to C29 steranes and diasteranes indicates mixed sources—marine and terrigenous—with prospects to generate both oil and gas.