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
Provenance of the Middle Permian Zhesi Formation in central Inner Mongolia, northern China: constraints from petrography, geochemistry and detrital zircon U–Pb geochronology
TL;DR: In this paper, an integrated approach incorporating detailed field observation and measurement, framework petrography, whole-rock geochemistry and detrital zircon U-Pb geochronology is applied to investigate this problem.
Journal ArticleDOI
Chemical and isotopic (B, Sr) composition of alluvial sediments as archive of a past hydrothermal outflow
TL;DR: The geochemical and isotopic signature of Quaternary alluvial sediments filling a post-orogenic basin along the Tyrrhenian coasts of Italy (Cornia Plain, Tuscany) was investigated to unravel possible interactions with geothermal fluids from the Larderello geothermal field.
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Provenance and tectonic settings of the Late Paleozoic sandstones in central Inner Mongolia, NE China: Constraints on the evolution of the southeastern Central Asian Orogenic Belt
TL;DR: In this article, a combined analysis of petrography, whole-rock major and trace element, and Nd isotope is carried out on representative sandstones from the Late Paleozoic sedimentary strata (420-270)Ma).
Journal ArticleDOI
Evolution of a Cambro-Ordovician active margin in northern Gondwana: Geochemical and zircon geochronological evidence from the Góry Sowie metasedimentary rocks, Poland
Anne-Sophie Tabaud,Pavla Štípská,Stanisław Mazur,Karel Schulmann,Jitka Míková,Jean Wong,Min Sun +6 more
TL;DR: The Gory Sowie Massif (GSM) in Poland represents a Devonian high pressure-ultra-high pressure (HP-UHP) terrane dominated by paragneiss, with subordinate orthogneiss, metabasite and felsic granulite as mentioned in this paper.
Journal ArticleDOI
Provenance of sandstones from the Neoproterozoic Bombouaka Group of the Volta Basin, northeastern Ghana
TL;DR: The provenance and tectonic setting of sandstones from the Bombouaka Group of the Voltaian Supergroup, in the northeastern part of Ghana, have been constrained from their petrography and whole-rock geochemistry as discussed by the authors.
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