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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Heavy metal contamination and provenance of sediments recovered at the Grijalva River delta, southern Gulf of Mexico
TL;DR: This article examined textural characteristics, carbonate, organic carbon and chemical composition of sediment samples recovered in the nearshore region at the Grijalva River mouth, southern Gulf of Mexico.
Journal ArticleDOI
An extension of the Svecofennian orogenic province into NE Poland: Evidence from geochemistry and detrital zircon from Paleoproterozoic paragneisses
TL;DR: In this article, the authors show that the detrital zircon populations in the two Polish metasediments have the same age distributions; a dominant Paleoproterozoic population at 2.1-1.9
Journal ArticleDOI
Evolution of the Palaeozoic basement of the North Patagonian Andes in the San Martín de los Andes area (Neuquén, Argentina): petrology, age and correlations
Samanta Serra-Varela,Pablo Diego González,Raúl Eduardo Giacosa,Nemesio Heredia,D. Pedreira,Fidel Martín-González,Ana María Sato +6 more
TL;DR: In this paper, Detrital zircon analysis (U-Pb Q-ICP-LA-MS) yielded a maximum depositional age of 501±14 Ma (Series 3 Cambrian) for this sedimentary protolith.
Journal ArticleDOI
Geochemistry of Birimian phyllites from the Obuasi and Prestea Mines, Southwestern Ghana: Implications for provenance and source-area weathering
TL;DR: In this paper, Phyllites from the Ashanti Belt of the Paleoproterozoic Birimian rocks of Ghana were analyzed for their major and trace element geochemistry in order to constrain their provenance and source area weathering.
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