Journal ArticleDOI
Geochemical classification of terrigenous sands and shales from core or log data
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In this article, a means of relating geochemical concentrations to existing sandstone classification schemes is proposed based on three chemical parameters: the SiO2/Al2O3 ratio, the Fe 2O3/K2O ratio, and the Ca content.Abstract:
A means of relating geochemical concentrations to existing sandstone classification schemes is based on three chemical parameters: the SiO2/Al2O3 ratio, the Fe2O3/K2O ratio, and the Ca content. In terrigenous sands and shales, the SiO2/Al2O3 ratio separates Si-rich quartzarenites from Al-rich shales, with other sand types showing intermediate values. The ratio of total iron (as Fe2O3) to K2O separates lithic sands (litharenites and sublitharenites) from feldspathic sands (arkoses and subarkoses). In addition, very high Fe2O3/K2O ratios indicate Fe-rich shales (e.g., pyritic, sideritic, hematitic) or Fe-rich sands (e.g., gl uconitic) depending on the silica/alumina ratio. The Ca content is used to differentiate noncalcareous from calcareous sandstones and shales and to separate siliciclastic from carbonate rocks. Sandstones are classified the same by this scheme as by petrographic analysis about 84% of the time, and shales are effectively discriminated from sandstones. The requisite input data can be accurately supplied by geochemical well-logging measurements, enabling unbiased sandstone classification to be displayed on a continuous basis with depth.read more
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Journal ArticleDOI
Provenance of Late Ordovician sedimentary rocks in the SE Yangtze block: Implications for deposition in an active continental margin
TL;DR: In this article, the late Ordovician sedimentary rocks in the northeastern Jiangnan Orogen have been constrained based on systemic analyses of petrology, heavy mineral assemblages, geochemistry, and detrital zircon U-Pb ages, which provide vital clues for reconstructing the evolution of this belt during the early Paleozoic.
Journal ArticleDOI
Detrital zircon provenance of Carboniferous sandstones of the Variscan Externides (SW Poland) – record of the eastern Variscides exhumation
TL;DR: In this article, eight sandstone samples from boreholes located in the area of SW Poland were selected for petrography, whole rock geochemistry and detrital zircon U-Pb dating.
DissertationDOI
Geocronologia U/PB em zircões detríticos e a evolução tectônica e estratigráfica da bacia espinhaço no setor meridional
TL;DR: Agarwal et al. as discussed by the authors proposed a method to solve the problem of expartivization in the context of the Equation of ExPLICATIVO (EEXTO) problem in Brazil.
Journal Article
Pattern of Geochemical and Sedimentological Variability of the Albian to Cenomanian Upper Bima Sandstone, Benue Trough, Nigeria: Implications on Tectonic provenance and Source Area Weathering
TL;DR: In this article, the authors present the pattern of geochemical and sedimentological variability of the Albian to Cenomanian Upper Bima sandstone in Upper Benue Trough, NE Nigeria.
Journal ArticleDOI
Geochemical characterization of FE-1 well, Onshore Western Niger Delta Basin, Nigeria
F.O. Amiewalan,F.A. Lucas +1 more
TL;DR: In this article, major oxides and trace elements analysis was carried out on ditch cutting samples of FE-1 well, Onshore, Niger Delta Basin, to define their oxygen condition, paleo-climatic conditions, provenance, tectonic setting, sandstone classification and maturity of the sediments.
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