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
Journal ArticleDOI
Detrital zircon U-Pb and Hf isotopic and whole-rock geochemical study of the Bayan Obo Group, northern margin of the North China Craton: Implications for Rodinia reconstruction
TL;DR: The Bayan Obo Group unconformably overlays the Late Neoarchean to Paleoproterozoic basement rocks and has been subdivided into three successions by two prominent unconformities as discussed by the authors.
Journal ArticleDOI
Petrology and geochemistry of greywackes of the ~1.6 Ga Middle Aravalli Supergroup, northwest India: evidence for active margin processes
Nurul Absar,B. Sreenivas +1 more
TL;DR: In this article, geochemical and petrological studies of the well-preserved greywacke horizon of the Aravalli Group were carried out to constrain the early evolution of the basin.
Journal ArticleDOI
Provenance, diagenesis, tectonic setting and geochemistry of Rudies sandstone (Lower Miocene), Warda Field, Gulf of Suez, Egypt
TL;DR: In this paper, a combination of petrographic, mineralogical and geochemical techniques were used to study the Lower and Middle Rudies sandstones in the Gulf of Suez basin.
Chemostratigraphy of the Upper Carboniferous Schooner Formation, southern North Sea
TL;DR: Chemostratigraphy has enabled the Schooner Formation encountered in well 44/21-3 to be divided into three chemostigraphical units (S1, S2 and S3) and eleven sub-units (S 1a-f, S 2a-b and S 3a-c), based on variations in mudstone and sandstone geochemical data acquired from core samples and cuttings as discussed by the authors.
Journal ArticleDOI
Late Triassic sedimentary records in the northern Tethyan Himalaya: Tectonic link with Greater India
Huawen Cao,Yong Huang,Guangming Li,Guangming Li,Linkui Zhang,Jianyang Wu,Lei Dong,Zuo-wen Dai,Zuo-wen Dai,Liu Lu,Liu Lu +10 more
TL;DR: In this article, detrital zircon U-Pb ages and whole-rock geochemical data for clastic rocks from flysch strata in the Shannan area were reported.
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