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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Journal ArticleDOI
High-P tectono-metamorphic evolution of mylonites from the Variscan basement of the Northern Apennines, Italy
Deborah Lo Pò,Roberto Braga,Hans-Joachim Massonne,Giancarlo Molli,Alessandra Montanini,Giuseppe Maria Bargossi +5 more
TL;DR: In this article, the authors investigated the possibility to reconstruct a complete pressure -temperature -deformation path of mylonitic micaschist and amphibolite by integrating microstructural analysis, mineral chemistry and thermodynamic modelling.
Journal ArticleDOI
Geochemical features and sources of clastic material in Paleozoic terrigenous deposits of the northeastern flank of the South Mongolia–Khingan orogenic belt
TL;DR: The results of geochemical and geochemical studies of terrigenous rocks of the main stratigraphic subdivisions in the northeastern flank of the South Mongolia-Khingan orogenic belt and also the results of U-Pb (LА-ICP-MS) geochronological studies of detrital zircons from these deposits are presented as mentioned in this paper.
Shelf-to-canyon sedimentation on the South Westland Continental Margin, Westland, New Zealand.
TL;DR: In this article, the authors present a Table of Table of Tables of the Table of contents of the table. [2] and [3]... [4].
Journal ArticleDOI
The geochemical composition of the Palu Formation from the Palu-Uluova basin, Elaziğ, Eastern Anatolia (Turkey): Implication of source area, weathering, and tectonic setting
Dicle Bal Akkoca,Osman Karataş +1 more
TL;DR: In this article, geochemistry of clastic clastic rocks from the Palu Formation, Eastern Turkey has been investigated, and X-ray diffraction patterns show that Hacimekke samples are comprised by calcite, clay, mica, quartz, feldspar, dolomite, and serpentine.
Journal ArticleDOI
The ammonium content in the Malayer igneous and metamorphic rocks (Sanandaj-Sirjan Zone, Western Iran)
TL;DR: The ammonium content in the Malayer igneous and metamorphic rocks (Sanandaj-Sirjan Zone, Western Iran) has been determined by using the colorimetric method on 26 samples from igneous (S-types) and mafic (mafic) rocks.
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