Journal ArticleDOI
Geochemical classification of terrigenous sands and shales from core or log data
Reads0
Chats0
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
More filters
OtherDOI
Statistical tables and charts showing geochemical variation in the Mesoproterozoic Big Creek, Apple Creek, and Gunsight formations, Lemhi group, Salmon River Mountains and Lemhi Range, central Idaho
TL;DR: In this article, the authors propose a method to solve the problem of homonymity in homonym identification, i.e., "homonymity-based homonymization".
Journal ArticleDOI
Geochemistry and Provenance of Sandstone Unit in Tanjero Formation in Sulimania Area, NE-Iraq.
Sarmad A Ali,Eman Mahdi Mohmmad +1 more
TL;DR: The presence of quartz, chert, carbonates and igneous and metamorphic lithic grains and fossils in the Tanjero sandstone clastic rocks indicates that the southern Neotethys Ocean was a shallow seaway during their deposition.
Journal ArticleDOI
Geochemistry of metasedimentary clastic rocks from Dhanjori and Badampahar Groups, Singhbhum Craton, Eastern India: implications for tectonic setting and Archean–Proterozoic boundary
Pawan Kumar Yadav,Manorama Das +1 more
TL;DR: In this article, the authors presented a comprehensive geological and geochemical study of metasedimentary clastic rocks from Dhanjori and Badampahar Groups, Singhbhum Craton, Eastern India.
Journal ArticleDOI
Provenance and tectonic setting of the Palaeozoic sediments in the northern Alxa area: Implications for the Central Asian Orogenic Belt
Journal ArticleDOI
Palaeoenvironment and provenance of the Early Eocene arenaceous sequence of Neyshaboor, Binalud region, Iran
TL;DR: In this paper, two stratigraphically important sections from the Damanjan and Taghan areas of Iran have been investigated based on field work, petrographic and geochemical analyses.
Related Papers (5)
Early Proterozoic climates and plate motions inferred from major element chemistry of lutites
H.W. Nesbitt,Grant M. Young +1 more
Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins
Mukul R. Bhatia,Keith A.W. Crook +1 more