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
Petrography and geochemistry of sandstones from the Injana Formation, Hemrin South Mountain, Northern Iraq: Implications for provenance, weathering and tectonic setting
TL;DR: In this article , the authors studied the Upper Miocene Injana Formation in the Hemrin South Mountain area, northern Iraq and found that the sandstones contain a wide spectrum of heavy minerals ranging from the most resistant ultrastable minerals (zircon, rutile and tourmaline) to the least resistant non-stable minerals (amphiboles and pyroxenes).
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Geochemical characteristics of sediments from East Dongting Lake and their implications for provenance and weathering
Yi Yuan,Baolin Liu,Hao Liu +2 more
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Geochemistry of quaternary sediments of Haji-Arab river catchment, Qazvin Plain, Northwestern Iran: provenance and source rock weathering
TL;DR: In this paper, the authors studied the sedimentary environment and rock weathering of the Haji Arab River catchment in northwestern Iran and concluded that the sediment from the depth of 6 to 2.6 meters formed under arid and high-energy conditions; however, this trend for sediments from 2 meters to surface changes slightly toward semi-humid up to semiarid climate.
Journal ArticleDOI
Geochemistry and mineralogy of Paleoproterozoic metasediments in the Imandra-Varzuga Greenstone Belt: Implications for sediment provenance, tectonic settings and weathering intensity at the transition to oxygenated surface environments
TL;DR: In this article , the authors investigated the effect of the Great Oxygenation Event (GOE) on the weathering of sediment layers in the Imandra-Varzuga Greenstone Belt.
Journal ArticleDOI
Reconstruction of Middle Miocene Surma Basin as Two Arcs Derived Sedimentary Model: Evidence from Provenance, Source Rock Weathering and Paleo-Environmental Conditions
Bubul Bharali,M. Faruque Hussain,Pradip Borgohain,Devojit Bezbaruah,V. Vanthangliana,Raghupratim Rakshit,Parakh Protim Phukan +6 more
TL;DR: In this article, the authors studied the geochemical behavior of Middle Bhuban sandstones collected from parts of Aizawl and Champhai districts of Mizoram, NE India.
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