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
Geochemistry of meta-sediments from Neoproterozoic Shimla and Chail Groups of Outer Lesser Himalaya: Implications for provenance, tectonic setting, and paleo-weathering conditions
Kumar Batuk Joshi,Soumya Ray,Talat Ahmad,Talat Ahmad,Satyanarayanan Manavalan,Keshav Krishna Aradhi +5 more
Journal ArticleDOI
Research on the Quaternary fluvial geomorphological surface sequence of the foreland region in southern Longmen Shan, eastern Tibet
Dawei Jiang,Shimin Zhang,Wei Li +2 more
TL;DR: In this paper, a geomorphological surface sequence for the foreland region was established to study the tectonic surface processes of the eastern Tibetan Plateau, using field survey of abandoned alluvial fans that developed during the middle Pleistocene and the terraces of the modern Qingyi River.
Journal ArticleDOI
Petrography and geochemistry of the Middle Jurassic Fort Member Sandstone, Jaisalmer Formation, Western India: Implications for weathering, provenance, and tectonic setting
TL;DR: In this article , the authors examined the Middle Jurassic Fort Member Sandstone (FMS) of the Jaisalmer Formation in Western India to understand palaeathering, provenance of sediments, and to decipher the tectonic setting.
Journal ArticleDOI
Source-to-Sink Analysis of a Transtensional Rift Basin from Syn-Rift to Uplift Stages
Journal ArticleDOI
Geochemistry and zircon U–Pb–Hf isotopic data for Permo-Carboniferous sediments in the Solonker Zone, Inner Mongolia, China: constraints on depositional age, provenance and tectonic setting
TL;DR: In this paper, stratigraphic, geochemical and detrital zircon analyses for Permo-Carboniferous sediments have been undertaken to resolve this problem.
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