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
Citations
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Journal ArticleDOI
Paleogeography of the West Burma Block and the eastern Neotethys Ocean: Constraints from Cenozoic sediments shed onto the Andaman-Nicobar ophiolites
P. C. Bandopadhyay,Douwe J.J. van Hinsbergen,Douwe J.J. van Hinsbergen,Debaditya Bandyopadhyay,Debaditya Bandyopadhyay,Debaditya Bandyopadhyay,Alexis Licht,Alexis Licht,Eldert L. Advokaat,Eldert L. Advokaat,Alexis Plunder,Biswajit Ghosh,Arnab Dasgupta,João Trabucho-Alexandre +13 more
TL;DR: In this paper, the authors studied the provenance of clastic sediments of the Andaman-Nicobar accretionary ridge using petrography, geochemistry, and detrital zircon geochronology.
Journal ArticleDOI
Provenance and depositional history of the Mesozoic Sanjiang Basin (northeastern China): implications for the uplift history of the northeastern Asian continental margin
Book ChapterDOI
Production of Chemostratigraphic Correlation Schemes
TL;DR: In this paper, a hierarchical correlation scheme is proposed for sandstone and mudrock samples in studies of clastic sediments, based on the recognition of correlative zones, subzones, divisions and subdivisions.
Formation Conditions of the Protoliths of Upper Riphean and Vendian Metapelites in the Bodaibo Zone, Baikal–Patom Foldbelt
V. N. Podkovyrov,A. V. Maslov +1 more
Journal ArticleDOI
Provenance of sediments from the Niger Delta, Gulf of Guinea: Evidence from geochemistry
TL;DR: In this paper , the authors collected two cores (GC09 and GC10) on the shelf break of the Niger Delta, Gulf of Guinea to assess their provenance using total carbon (TC), total organic carbon (TOC), major elements, and trace elements.
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