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
Geochemical signatures of recent bar deposits in the Tista river, Bangladesh: Implications to provenance, paleoweathering and tectonics
Pradip Kumar Biswas,M. Shafiqul Alam,A. S. M. Mehedi Hasan,Syed Samsuddin Ahmed,Mohammad Nazim Zaman +4 more
TL;DR: In this paper, the elemental geochemistry of recent bar deposits of the Tista river in the north western part of Bangladesh is evaluated to evaluate their provenance, paleoweathering and tectonic setting.
Geochemistry of Birimian phyllites from the Obuasi and Prestea Mines, Southwestern Ghana: Implications for provenance and source-area weathering
TL;DR: In this article, the major and trace element geochemical properties of phyllites from the Ashanti Belt of the Paleoproterozoic Birimian metasediments of Ghana were analyzed for their major-and trace-element geochemistry in order to constrain their provenance and source area weathering.
Journal ArticleDOI
Clay mineral diagenesis in alternating mudstone‐sandstone beds from Late Palaeozoic strata of the Anadarko Basin, United States
TL;DR: In this article , the authors investigated fine-grained sediment is argillaceous to siliceous mudstone, dominated by Illite/mica and mixed-layer illite-smectite.
Journal ArticleDOI
Genesis of the Halılar Metasediment-Hosted Cu-Pb (±Zn) Mineralization, NW Turkey: Evidence from Mineralogy, Alteration, and Sulfur Isotope Geochemistry
TL;DR: In this paper , the authors investigated the evolution of Halılar Cu-Pb (±Zn) mineralization (NW Turkey) based on mineralogical and geochemical results and sulfur isotope data.
Journal ArticleDOI
Geochemistry and organic petrography of the Middle Permian Lucaogou alkaline lacustrine oil shale in the southern Junggar Basin, China: Implications for formation conditions and organic matter accumulation
Jinqi Qiao,Qingyong Luo,Kuihua Zhang,Guanlong Zhang,Jincai Duan,Dandan Wang,Hong-Zhou Yu,Sheng Xiang Wang,Yansheng Qu,Kopaevich Ludmila Fedorovna +9 more
TL;DR: In this article , a synthetic use of major element oxides, trace, and rare-earth elements as well as organic petrography data as proxies to evaluate the provenance, paleotectonic setting, paleoclimate and weathering conditions, paleoenvironment, and paleoproductivity of the Lucaogou oil shale from the Qi 1 well located in the southern Junggar Basin was investigated, which can be divided into two members based on lithology.
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