Onocerane and other triterpenoids in Late Cretaceous sediments from the Upper Benue Trough, Nigeria: tectonic and palaeoenvironmental implications

Pearson, Michael J.; Obaje, Nuhu George

doi:10.1016/s0146-6380(99)00069-8

Cited by 30 publications

(24 citation statements)

References 17 publications

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“…Slight even carbon number n-alkane predominances or smooth distributions in the n-C 20 -C 30 range have been ascribed to reductive processes or bacterial inputs [25]. Our results, however, differ slightly from the even/odd predominance of nalkanes (C 14 -C 22 ) reported for Cretaceous sediments from the upper Benue Trough, Nigeria which was tentatively attributed to hyper salinity [26]. In this study, the odd/even predominances in the n-C 17 -C 31 range (Table 2) observed for most stations could be traced to mixed origin of terrestrial/biogenic, bacterial/microbial and anthropogenic organic source inputs, with stronger terrestrial/biogenic signal in stations from Imo, Qua Iboe and Bonny than Warri coastal areas.…”

Section: Fig 3 Examples Of Gas Chromatograms (Tic) Of N-alkane Distrcontrasting

confidence: 85%

Forensic Analysis and Source Partitioning of Aliphatic Hydrocarbon Contaminants in Surface Sediments from the Niger Delta, Nigeria

Fubara¹

2014

IJEMA

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Forensic analyses and source partitioning modeling were used in characterizing aliphatic hydrocarbon contaminant compositions in surface sediments from coastal areas of the Niger Delta region of Nigeria. The Total Organic carbon (TOC) contents for the sediments ranged from 0.44 to 4.26% (mean 2.36 ± 1.03). The concentrations of total aliphatic hydrocarbon in the entire study area ranged from 1.65 to 61.34mg/kg dry weight, with overall average of 21.52 ± 22.00. The mean concentrations of aliphatic hydrocarbon (C 16 -C 31 ) for the sediments in the upper, middle and lower zones of the study area were in the ranges of 0.04 -5.44mg/kg, 0.04 -4.91mg/kg and 0.11 -10.31mg/kg, respectively. CPI values in the broad range of 0.31 -13.32 for the entire stations is indicative of mixed hydrocarbon inputs. A predominance of odd/even carbon n-alkanes and UCM with different shapes and ranges were observed and suggest inputs from multiple sources. Source partitioning modeling using Factor analyses reduced the data set into three principal components (PCs) confirming inputs from biogenic, anthropogenic and microbial/bacterial sources.

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Section: Fig 3 Examples Of Gas Chromatograms (Tic) Of N-alkane Distrcontrasting

confidence: 85%

Forensic Analysis and Source Partitioning of Aliphatic Hydrocarbon Contaminants in Surface Sediments from the Niger Delta, Nigeria

Fubara¹

2014

IJEMA

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“…3; Table 1) eluted between n-C 30 and n-C 31 , with a base peak at m/z 123, M + at m/z 414 and another intense fragment at m/z 191 that exceeded m/z 193. According to published spectra, this compound was assigned as onocerane I (Henderson et al, 1969;Pearson and Obaje, 1999;Jacob et al, 2004). Compound Hop ( Fig.…”

Section: Biomarker Identificationmentioning

confidence: 99%

“…Onocerane I (Ono) has a 8,14-seco-gammacerane structure, possible precursors of which have been reported in ferns and angiosperms (Pearson and Obaje, 1999;Jacob et al, 2004). However comparison of Ono relative concentration with that of the C 30 fernene (Fig.…”

Section: Origin Of Biomarkersmentioning

confidence: 99%

High frequency floral changes at the Paleocene–Eocene boundary revealed by comparative biomarker and palynological studies

Garel

Quesnel

Jacob

et al. 2014

Organic Geochemistry

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The Cap d'Ailly area (Upper Normandy, France) shows several terrestrial-lagoonal sections recording the negative Carbon Isotope Excursion (CIE) associated with the Paleocene-Eocene Thermal Maximum (PETM; 55.8 Ma). A study of the biomarkers and spores/pollen content of the Vasterival section gave complementary information on paleofloral changes that occurred around the PaleoceneEocene (P-E) boundary. Aliphatic hydrocarbon fractions revealed a high abundance of vascular plant biomarkers, including tricyclic diterpanes derived from conifers, fernenes derived from ferns and des-A-triterpenes derived from angiosperms. Whereas the vegetation of the depositional environment surroundings seemed alternately dominated by ferns and angiosperms (as revealed by biomarkers), the regional flora seemed strictly dominated by angiosperms such as Juglandaceae (as revealed by pollen).Spores/pollen assemblages reveal no major turnover in the paleovegetation, but slight variation in vegetation composition. However, both biomarkers and spores/pollen exhibited two intervals of rapid floral changes: the first occurred around the P-E boundary and the second at the top of the strictly terrestrial unit that coincides with a marine transgression. Comparison of these data with published paleoclimatic results, obtained from the same samples, indicated that the first interval of floral change was correlated with strong paleohydrological perturbations, whereas the second was linked to an increasing marine influence.

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“…Quant ifying biomar ker var iat ion through sediment ar y sequences facilit at es r econst ruct ion of past envir onment al var iabilit y over var ious t imescales, fr om cent ur ies (M cCaffr ey et al, 1991;Or t iz et al, 2016) t o millions of year s (Pear son and Obaje, 1999;Tzor t zaki et al, 2013). H owever , t he diagenet ic fat e of biomar ker s must be assessed befor e their dist r ibut ion and abundance can be used as quant it at ive pr oxies.…”

mentioning

confidence: 99%

Leaf lipid degradation in soils and surface sediments: A litterbag experiment

Egasse

Anquetil

et al. 2017

Organic Geochemistry

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Onocerane and other triterpenoids in Late Cretaceous sediments from the Upper Benue Trough, Nigeria: tectonic and palaeoenvironmental implications

Cited by 30 publications

References 17 publications

Forensic Analysis and Source Partitioning of Aliphatic Hydrocarbon Contaminants in Surface Sediments from the Niger Delta, Nigeria

Forensic Analysis and Source Partitioning of Aliphatic Hydrocarbon Contaminants in Surface Sediments from the Niger Delta, Nigeria

High frequency floral changes at the Paleocene–Eocene boundary revealed by comparative biomarker and palynological studies

Leaf lipid degradation in soils and surface sediments: A litterbag experiment

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