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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Triassic turbidites in the West Qinling Mountains, NW China: Part of the collisional Songpan-Ganzi Basin or an active forearc basin?
TL;DR: In this paper, the age and provenance of lower to Middle Triassic clastic rocks in the West Qinling Mountains along NE margin of the Qinghai-Tibet Plateau are generally regarded as part of the Songpan-Ganzi flysch Basin.
Journal ArticleDOI
Metasedimentary rocks of the paleoarchean Dniester-Bug Group, Ukrainian Shield: Composition, age, and sources
S. B. Lobach-Zhuchenko,V. V. Balagansky,Sh. K. Baltybaev,G. V. Artemenko,E. S. Bogomolov,A. V. Yurchenko,L. M. Stepanyuk,V. V. Sukach +7 more
TL;DR: In this article, the primary composition of the Dniester-bug Group of the Ukrainian Shield was reconstructed as association of Fe-rich sandstones and sublitharenites, Fe-shales, and BIFs.
Journal ArticleDOI
Holocene monsoon and sea-level variability from coastal lowlands of Kerala, SW India
Jithu Shaji,Upasana S. Banerji,K. Maya,Kumar Batuk Joshi,Ankur J. Dabhi,N Bharti,Ravi Bhushan,D. Padmalal +7 more
TL;DR: In this article , a 32 m long sediment core (L7) from Upper Kuttanad Kole wetlands (Kuttoor), Kerala, Southwest India was used to decipher the Holocene sea-level and climate variability based on geochemical and palynological proxies supported by 10 AMS radiocarbon ages.
Journal ArticleDOI
Formation and evolution of the end-Permian Oktyabrsk volcanic crater in the Tunguska Basin, Eastern Siberia
TL;DR: In this article, the authors examined the geochemistry and petrography of crater sediments within the uppermost portion of the Oktyabrsk diatreme complex in the southern Tunguska Basin, Eastern Siberia.
Journal ArticleDOI
Mineralogy and geochemistry of the Ngaoundaba Crater Lake sediments, northern Cameroon: implications for provenance and trace metals status
Armel Zacharie Ekoa Bessa,John S. Armstrong-Altrin,Gentry Calistus Fuh,Thierry Bineli Betsi,Tebogo Kelepile,Paul Désiré Ndjigui +5 more
TL;DR: In this article, the Ngaoundaba Crater Lake sediments were collected using a manual core sampler at 5 to 8 m water depth and two sediment cores from the littoral and center of the lake were analyzed for grain size distribution, water content, organic matter content, mineralogy, and major and trace element concentrations.
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