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
Geochemistry and Sm–Nd isotopic sources of Late Ediacaran siliciclastic series in the Ossa–Morena Complex: Iberian–Bohemian correlations
Esther Rojo-Pérez,José Manuel Fuenlabrada,Ulf Linnemann,Ricardo Arenas,Sonia Sánchez Martínez,Rubén Díez Fernández,Luis Miguel Martín Parra,Jerónimo Matas,Pilar Andonaegui,Javier Fernández-Suárez +9 more
TL;DR: The Cadomian basement in central and southern Europe is composed by Ediacaran-Early Cambrian sequences that appear dismembered along the Variscan Orogen as discussed by the authors.
Journal ArticleDOI
Late Precambrian terrigenous rocks of the Anamakit–Muya zone of the Baikal–Muya belt: geochemistry and results of LA-ICP-MS dating of detrital zircons
TL;DR: In this paper, a comparative geochemical characteristics of Late Precambrian sedimentary rocks (Ust'-Kelyana and Tuluya rock units) in the Anamakit-Muya zone of the Baikal belt is given, and the conditions of their sedimentation are considered.
Journal ArticleDOI
Geochemistry of paleozoic terrigenous sediments from the Oldoi terrane, eastern Central Asian orogenic belt, as an indicator of geodynamic conditions during deposition
TL;DR: The analysis of the major and trace element geochemistry of Paleozoic terrigenous sediments from the Oldoi terrane, eastern Central Asian orogenic belt, supports a predominantly felsic source consisting of granites and recycled sediments.
Journal ArticleDOI
Provenance and paleogeography of the Southern Paraná Basin : geochemistry and U\\Pb zircon geochronology of the Carboniferous-Permian transition.
TL;DR: The Carboniferous-Permian transition of the intracratonic Parana Basin (S Brazil) includes important evidence of the climate change, tectonics, and paleogeographic configuration of SW Gondwana as mentioned in this paper.
Journal ArticleDOI
Detrital chromites in metasediments of the East-Arabian continental margin in the Saih Hatat area: constraints for the palaeogeographic setting of the Hawasina and Semail basins (Oman Mountains)
TL;DR: In this paper, the authors constrain the possibility of one continuous history of extension (starting along the east Arabian continental margin in the Permian) that was followed by one continuously history of convergence starting at 90 Ma near a dead oceanic ridge.
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