Journal ArticleDOI
Geochemical classification of terrigenous sands and shales from core or log data
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TLDR
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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Sedimentary petrology and detrital zircon U–Pb and Lu–Hf constraints of Mesoproterozoic intracratonic sequences in the Espinhaço Supergroup: Implications for the Archean and Proterozoic evolution of the São Francisco Craton
Felipe Guadagnin,Felipe Guadagnin,Farid Chemale Junior,Farid Chemale Junior,A.J.C. Magalhães,Luciano Alessandretti,Manoela Bettarel Bállico,Andréa Ritter Jelinek +7 more
TL;DR: In this article, the origins of sedimentary zircon grains in the Espinhaco Basin of Brazil were investigated using a combination of stratigraphic and sedimentary data.
Journal ArticleDOI
Chemical and minero-petrographic features of Plio-Pleistocene fine-grained sediments in Calabria, southern Italy
TL;DR: In this paper, the composition of fine-grained sediments from different areas of Calabria (southern Italy) have been studied to unravel the interplay of provenance.
Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis
TL;DR: In this article, a major and trace element-based characterization of the metasedimentary protoliths of three metamorphic units of Sierra de San Luis (Pringles Metamorphic Complex, San Luis Formation and Conlara Metmorphic Complex) is presented, which consistently suggest a continental island arc and/or active margin setting as the more probable geodynamic scenario for the deposition of the sedimentary precursors of the studied units.
Journal ArticleDOI
Mineral Reactions in the Geological Underground Induced by H2 and CO2 Injections
Steven Henkel,Dieter Pudlo,Lars Werner,Frieder Enzmann,Viktor Reitenbach,Daniel Albrecht,Hilke Würdemann,Katja Heister,Leonhard Ganzer,Reinhard Gaupp +9 more
TL;DR: The H2STORE project is part of the German program to reduce environmental pollution by energy production and in saving fossil natural resources as mentioned in this paper, and physico-chemical processes in the CO2-H2 system by organic and inorganic reactions receive increasing attention.
Journal ArticleDOI
Geochemical characteristics of Holocene sediments from Chuadanga district, Bangladesh: Implications for weathering, climate, redox conditions, provenance and tectonic setting
Ismail Hossain,Krisna Kanta Roy,Pradip Kumar Biswas,Mahbubul Alam,Md. Moniruzzaman,Farah Deeba +5 more
TL;DR: In this article, the geochemical characteristics of the Holocene sediments from Alamdanga area, Chuadanga district, Bangladesh have been analyzed and the results show a wide variation in accordance with stratigraphy in major element contents (e.g. SiO2 69.46-82.13, Al2O3 2.28-8.88 in wt%), reflecting the distinctive provenance and in part an unstable period in terms of tectonic activity.
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