Search Results

1 - 6 of 6 items :

  • "paleo-oxygenation" x
Clear All
Geochemical assessment of claystone deposits from the Patti Formation, Southern Bida Basin, Nigeria

Abstract

Geochemical studies of claystone deposits from the Patti Formation in the southern Bida Basin, north-Central Nigeria, were carried out on representative samples to determine the basin’s depositional conditions, provenance and tectonic setting. The localities within the study area included Gegu, Ahoko, Ahoko-Etigi, Omu and Idu.

Semi-quantitative phase analysis using the Rietveld method and X-ray powder diffraction data revealed that the claystone samples had prominent kaolinite with other constituents such as quartz, illite–muscovite, K-feldspar, pyrite, marcasite, anatase, rutile and gorceixite.

Enrichment of Al2O3, Ba, Th, Sr, Cr and La suggests that these elements are primarily controlled by the dominant clay minerals.

Geochemical parameters such as U, U/Th, Ni/Co, V/Cr and Cu/Zn ratios strongly implied that these claystones were deposited in an oxidising environment. Provenance deducing ratios for felsic, mafic and basic igneous rocks were compared. Al2O3/TiO2 ratio suggested intermediate to felsic rocks as the probable source rocks for the claystone samples; however, Y/Ni, Cr/V, La/Sc and Th/Sc ratios suggested a felsic progenitor. The tectonic discrimination diagram showed that the samples’ plot was within the region specified for passive margin-type tectonic setting.

Open access
High-frequency sea-level changes recorded in deep-water carbonates of the Upper Cretaceous Dol Formation (island of Brač, Croatia)

reflected in carbonate basin facies (Triassic, Northern Calcareous Alps, Austria). Facies 25, 253-278. Reijmer J. J. G., Ten Kate W. G. H. Z., Sprenger A. & Schlager W. 1991: Calciturbidite composition related to exposure and flooding of a carbonate platform (Triassic, Eastern Alps). Sedimentology 38, 1059-1074. Savrda C. E. & Bottjer D. J. 1986: Trace-fossil model for reconstruction of paleo-oxygenation in bottom waters. Geology 14, 1, 3-6. Savrda C. E. & Bottjer D. J. 1989: Trace

Open access
Genetic sequence stratigraphy on the basis of ichnology for the Middle Jurassic basin margin succession of Chorar Island (eastern Kachchh Basin, western India)

.D. & Uygur, K., 1982. Mixed terrigenous-carbonate rocks in Jurassic Arapien Shale of central Utah. [In:] D.L. Nielson (Ed.): Overthrust belt of Utah . Utah Geological Association 10, 181–198. Ruban, D.A., 2015. Mesozoic long-term eustatic cycles and their uncertain hierarchy. Geoscience Frontiers 6, 503–511. Savrda, C.E. & Bottjer, D.J., 1986. Trace-fossil model for reconstruction of paleo-oxygenation in bottom waters. Geology 15, 3–6. Seilacher, A., 1953. Studien zur Palichnologie II. Die fossilen Ruhespuren (Cubichnia). Neues Jahrbuch für Geologie

Open access
Oligocene dinoflagellate cysts from the North Alpine Foreland Basin: new data from the Eggerding Formation (Austria)

-200. Popov S. V., Rögl F., Rozanov A. Yu., Steininger F. F., Shcherba I. G. & Kováč M. 2004: Lithological-Paleogeographic maps of Paratethys. Cour. Forsch.-Inst. Senckenberg 250, 1-46; maps 1-10. Powell A. J. 1992: Dinocysts of the Tertiary system. In: Powell A. J. (Ed.): A stratigraphic index of dinocysts. British Micropalaeont. Soc. Publ. Ser., Chapman and Hall , London, 155-251. Pross J. 2001: Paleo-oxygenation in Tertiary epeiric seas: evidence from dinoflagellate cysts. Palaeogeogr. Palaeoclimatol. Palaeoecol

Open access
Trace-fossil assemblages with a new ichnogenus in “spotted”
(Fleckenmergel—Fleckenkalk) deposits: a signature of oxygen-limited benthic communities

(Italy): parallels and differences. Geol. Soc. Amer. Bull. 123, 468-484. Savrda C.E. & Bottjer D.J. 1986: Trace-fossil model for reconstruction of paleo-oxygenation in bottom waters. Geology 14, 3-6. Savrda C.E. & Bottjer D.J. 1991: Oxygen-related biofacies in marine strata: an overview and update. In: Tyson R.V. & Pearson T.H. (Eds.): Modern and ancient continental shelf anoxia. Geol. Soc., Spec. Publ. 58, 201-219. Schlirf M. 2011: A new classification concept for U-shaped spreite trace fossils. Neu. Jb. Geol

Open access
Palaeontology of the Middle Turonian limestones of the Nysa Kłodzka Graben (Sudetes, SW Poland): biostratigraphical and palaeogeographical implications

. Elsevier, Amsterdam, 149- 158. Savrda, C. E. & Bottjer, D. J., 1986. Trace fossil model for reconstruction of paleo-oxygenation in bottom waters. Geology 14, 3-6. Schoeneichowa-Jaskowiak, M. & Krassowska, A., 1988. Paleomiąższości, litofacje i paleotektonika epikontynentalnej kredy górnej w Polsce [Palaeothickness, lithofacies and palaeotectonics of the epicontinental Upper Cretaceous in Poland]. Kwartalnik Geologiczny 32, 177-198. (in Polish, with English summary) Scupin, H., 1907. Die

Open access