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
New insights into the geologic evolution of the Grenvillian Trenton Prong inlier, Central Appalachian Piedmont, USA
TL;DR: New geochemical and 40Ar/39Ar hornblende and biotite data from the Grenvillian Trenton Prong inlier provide the first constraints for the identification of lithotectonic units, their tectonic setti... as discussed by the authors.
Journal ArticleDOI
Influence of continental rifting on sedimentation and its provenance and geodynamic implications: An example from late Paleoproterozoic Chandil Formation, eastern India
Priyanka Chatterjee,Shuvabrata De,Rajat Mazumder,Rajat Mazumder,Tohru Ohta,Jeffrey R. Chiarenzelli,Tapas Bhattacharyya +6 more
TL;DR: The Chandil Formation has been divided into three distinct sedimentary facies associations: the bottommost trough cross-stratified, poorly sorted and texturally immature, coarse- to medium-grained sandstone-shale facies association formed in a fluvial setting as mentioned in this paper.
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Petrography, geochemistry and provenance of the sediments of the Early Cretaceous Yanguoxia Formation, Lanzhou-Minhe Basin, Northwest China
TL;DR: The Yanguoxia Formation was formed in an unstable continental setting due to the northwards movement of Indian Plate triggered the collision between the Qilian fold belt and the Qinling fold belt during the Early Cretaceous as mentioned in this paper.
Journal ArticleDOI
Petrogenesis, geochemistry and structural evidence of the neoproterozoic Pan-African orogenic event in Ghana, West Africa
TL;DR: In this article, a detailed geological mapping exercise was conducted in some parts of the Eastern and Volta regions of Ghana to understand the local geology of these areas and how it best fits the regional geology and its implications in the Pan-African Orogenic event.
Journal ArticleDOI
Provenance of the Neoproterozoic and Upper Paleozoic Siliciclastic Complexes of the Eastern Taimyr: Petrographic, Geochemical, and Geochronological Data
TL;DR: The results of petrographic, geochemical, and isotopic studies of the Neoproterozoic and Upper Paleozoic sandstones of the Eastern Taimyr complement the available data on their genesis and confirm their molassic origin this article.
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