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The Paleoenvironmental Significance of Trace Fossils from the Paleocene Imo Formation, South-Eastern Nigeria

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The Paleoenvironmental Significance of Trace Fossils from the Paleocene Imo Formation, South-Eastern Nigeria View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by International Institute for Science, Technology and Education (IISTE): E-Journals Journal of Natural Sciences Research www.iiste.org ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online) Vol.6, No.22, 2016 The Paleoenvironmental Significance of Trace Fossils from the Paleocene Imo Formation, South-eastern Nigeria Chukwuemeka Frank Raluchukwu Odumodu Department of Geology, Chukwuemeka Odumegwu Ojukwu University, PMB. 02, Uli, Ihiala L.G.A, Anambra State, Nigeria Okon, Otobong Sunday Federal University, Oye-Ekiti, Ekiti State, Nigeria Abstract Trace fossils and lithofacies associations were studied to understand the paleodepositional environment of the Paleocene Imo Formation. The methodology involves lithologic logging to obtain sedimentological and ichnological data. Bioturbation index were used to estimate the intensity of biotubation of the various lithofacies associations. The trace fossils observed in the Imo Formation includes Ophiomorpha and Altichnus belonging to the Skolithos ichnofacies and Chondrites , Thalassinoides , Planolites , and Rosselia which belongs to the Cruziana ichnofacies. Six lithofacies association were distinguished and interpreted as follows; swaly cross- stratified sandstone represents a middle shoreface environment, laminated shale representing offshore to lower shoreface transition sediments, interbedded sandstone and shale as well as bioturbated sandstone deposited in upper shoreface environments, fossiliferous shale representing an upper offshore deposit while crossbedded sandstone is inferred to as foreshore-upper shoreface sediments. The gross depositional environment suggests sediments deposited in shallow marine environments lying between the foreshore-shoreface to offshore depositional settings. Keywords: Trace fossils, Ichnofossils, Lithofacies, Imo Formation, Niger Delta Basin 1 Introduction The Imo Formation refers to a formation which was previously known as “Imo Rivers shales”[Tattam, 1944] or the “Clay-shales” [Groove, 1951; Simpson, 1954 and Reyment and Barber, 1956]. However, Reyment [1965] formalized the name as Imo Shale with its type locality at the outcrops along the Imo River, in southeastern Nigeria. The formation is approximately 1000m in thickness [Reyment, 1965]. It consists of three different sandstone members, Ebenebe Sandstone, Umuna Sandstone and Igbaku Sandstone. These sandstone members of the Imo Formation, which outcrop up dip in the northern fringes of the Niger Delta, has been regarded as the outcrop equivalent of the Akata Formation [Short and Stauble, 1967; Avbovbo,1978], and is the main hydrocarbon source rock in the Niger Delta. Several palynological, lithological and stratigraphic based paleoenvironmental studies have been done for the Imo Formation. These previous studies include the works of Anyanwu and Arua [1990], Nwajide and Reijers [1996], Oboh-ikuonobe et al [2006], Odumodu and Nfor [2014] and Ekwenye et al [2014]. Previous studies that utilized ichnological data in facies analysis and paleoenvironmental reconstruction for the Imo Formation is very few [Anyanwu and Arua, 1990]. Pemberton et al [1992], Ekdale et al [1984] and Bromley [1996] outlined the usefulness of trace fossils in paleoenvironmental reconstruction. The sandstone member of the Imo Formation as exposed in the vicinity of Ndiwo, Ikporom and environs contains abundant tracefossils that will be useful for this purpose. The study area is situated around Ndiwo and Ikporom, located respectively at Akwa Ibom and Abia State (Fig. 1). The purpose of this paper is to describe the morphology, mode of occurrence of trace fossils from the Imo Formation studied around Ndiwo and Ikporom and interpret their paleoenvironmental significance using some evidence deduced from lithofacies analysis and trace fossil assemblages. 2. Method of study Outcrops of the Paleocene Imo Formation situated along Ikporom – Ndiwo road were systematically logged. Its lithology, stratal contacts, physical and biogenic sedimentary structures were equally observed. The ichnofossils were described and classified into various ichnogenera, ethological classes and ichnofacies associations using methods described by Seilacher [1964] and adapted by Mode [1997], Odumodu and Mode [2014] and Mode and Odumodu [2015]. Measurement of bioturbation intensity (B.I.) follows the scheme of Droser and Bottjer [1986, 1989] and Bottjer and Droser [1991]. Bioturbation intensity (B.I.) refers to the semi-qualitative determination of the extent of bioturbation or the degree to which the original physical sedimentary structures have been disrupted by biogenic reworking [Droser and Bottjer, 1986]. B.I. categorizes the extent of bioturbation into six classes; 1 (no bioturbation), 2(less than 10%), 3 (10 – 40 %), 4 (40-60%), 5 (60 – 100 %) and 6 (complete homogenization). 101 Journal of Natural Sciences Research www.iiste.org ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online) Vol.6, No.22, 2016 Table 1: Stratigraphic units in the Niger Delta (Short and Stauble, 1967; Avbovbo, 1978) Age Surface Subsurface Niger Delta Miocene - Recent Benin Formation Benin Formation U. Eocene - Oligocene Ogwashi – Asaba Formation Upper Agbada Formation Middle – Lower Eocene Nanka Formation / Ameki Formation Agbada Formation Paleocene Imo Formation Akata Formation Fig. 1: Geologic map showing accessibility to the study area Results Facies Associations The Imo Formation can be subdivided into six facies associations based on sedimentological and ichnological criteria (Table 2, Figure 3). These facies associations represent deposition in a variety of shallow marine environments from foreshore through shoreface to offshore water depths. Swaly cross-stratified sandstone – Middle shoreface Description The swaly cross-stratified sandstone facies association occurs in the basal part of the sequence. A thickness of about 8 m was observed in this facies association. Constituent lithofacies include bioturbated sandstone, swaly- cross stratified sandstone and planar crossbedded sandstone (Table 2, Figure 3). The bioturbated sandstone is present in the basal part of the section. It is 1 m thick and consists of fine grained sandstone. Sedimentary structure present is mainly planar cross beds. This facies association is fairly bioturbated (B.I. =2-3). Ichnogenera observed is only Ophiomorpha. The swaly cross-stratified sandstone overlies the bioturbated sandstone gradationally. It is 2 m in thickness and consists of medium grained sandstones. Sedimentary structures present are swaly cross- stratification and planar crossbeds. It is moderately bioturbated (B.I. = 3-4). Ichnogenera present includes Ophiomorpha and Rosselia issp. The planar cross-bedded sandstone makes a sharp contact with underlying and overlying lithofacies. It 102 Journal of Natural Sciences Research www.iiste.org ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online) Vol.6, No.22, 2016 is 5 m in thickness and consists of medium grained sandstones which are typically cross-bedded. It is fairly bioturbated (B.I. = 2). Ichnogenera present is only Ophiomorpha burrows. Interpretation The presence of planar crossbeds, swaly cross-strata and medium to coarse grained sandstones indicate that this facies association was deposited in energetic middle shoreface water depths. Swaly cross-stratification were interpreted by Walker and Plint [1992] as a feature of prograding storm-dominated shorefaces, in which storm processes have obliterated all records of fair weather sedimentation. The presence of Skolithos ichnofacies represented by Ophiomorpha nodosa and Cruziana ichnofacies represented by Rosselia is consistent with a middle shoreface interpretation. The scarcity or low diversity of ichnofossils in this facies association suggests high sedimentation rates, an increase in storm activity and other factors that make conditions unfavourable for invertebrate activity. Facies Common lithofacies and Fossils / Trace Depositional Associations sedimentary structures fossils Environment Swaly cross- Bioturbated sandstone, swaly Fairly bioturbated; Middle shoreface stratified sandstone cross-stratified sandstone and Ophiomorpha and Rosselia Planar crossbedded sandstone Laminated Siltstone-shale heterolith and Contains microforms of Offshore siltstone-shale shale. Horizontal parallel bivalves and gastropods transition lamination, Interbedded Bioturbated sandstone (low Bioturbation moderate in sandstone and angle crossbeds), wave ripple bioturbated sandstone; Upper shoreface shale laminated sandstone, trough Ophiomorpha and Chondrites . crossbedded sandstone, Bioturbation weak or absent in laminated shale and massive other facies pebbly beds. Bioturbated Bioturbated sandstone (Planar Bioturbation fairly moderate to sandstone crossbeds), wave ripple intense in bioturbated facies; Upper shoreface laminated sandstone, Ophiomorpha , Chondrites and bioturbated fine grained Altichnus . Bioturbation absent sandstone (high angle planar in wave ripple laminated facies. crossbeds) Fossiliferous shale Bioturbated sandstone, Bioturbation is moderate to sandstone-shale heterolith, intense; Ophiomorpha, Upper offshore laminated shale, fossiliferous Chondrites , Thalassinoides and mudstone and shelly beds Planolites. Bioturbation is absent in laminated shale facies and shelly beds. Planar crossbedded Wave ripple laminated Bioturbation is moderately high sandstone sandstone, Planar crossbedded in planar crossbedded Foreshore-Upper sandstone sandstone but absent in the shoreface
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