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
Geochemistry of the Paleoproterozoic Espanola Formation, Bruce Mines—Elliot Lake area, Ontario, Canada: implications for provenance, paleo-weathering, and tectonic setting
TL;DR: The Espanola Formation of the Paleoproterozoic Huronian Supergroup is a mixed carbonate-siliciclastic succession that is well exposed in the Bruce Mines-Elliot Lake Area, Ontario, Canada as discussed by the authors.
Journal ArticleDOI
Facies associations and chemostratigraphy of the Lower Cretaceous Kurnub Group and their boundaries, King Talal Dam section, northwestern Jordan
TL;DR: In this article, the identification of sequence boundaries, sequence stratigraphy, and their system tracts for the Lower Cretaceous strata of the Kurnub Group (Jordan) is described.
Journal ArticleDOI
Sedimentological and geochemical signatures of the Ebolowa Municipal Lake sediments (South-Cameroon): implication for provenance, weathering, and depositional environment conditions
Journal ArticleDOI
Sr-Nd-Pb-Hf-O isotopic constraints on the Neoproterozoic to Miocene upper and mid crust in central Chile and western Argentina and trench sediments (33°-35°S)
Guillaume Jacques,Folkmar Hauff,Kaj Hoernle,Kaj Hoernle,Stefan Jung,S. Mahlburg Kay,Dieter Garbe-Schönberg,Ilya N. Bindeman +7 more
TL;DR: In this article, the authors provided trace element and Sr-Nd-Hf-Pb-O isotope data on Neoproterozoic to Phanerozoic mid to upper crustal lithologies of the Andean basement in central Chile and western Argentina (33°-35°S; 69°-72°W).
Journal ArticleDOI
Geochemistry and paleogeographic implications of Permo-Triassic metasedimentary cover from the Tauern Window (Eastern Alps)
Gerhard Franz,Martin Kutzschbach,Eleanor J. Berryman,Anette Meixner,Anselm Loges,Anselm Loges,Dina S. Schultze,Dina S. Schultze +7 more
TL;DR: In this paper, the chemical composition of metasediments is a valuable source of paleogeographic information about the protolith's sedimentary environment, including B contents, and 10 / 11 B-isotope ratios from the Permo-Triassic metasedimentary cover of the Pfitsch-Morchner basin.
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