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
Geochemical variations in estuarine sediments : Provenance and environmental changes (Southern Spain)
TL;DR: The geochemical characteristics of sedimentary infilling in the central basin of the Odiel River estuary have allowed the determination of the sediment provenance and the environmental conditions during the last 10,000 years as mentioned in this paper.
Journal ArticleDOI
Zircon U–Pb and Lu–Hf isotopic and whole-rock geochemical constraints on the protolith and tectonic history of the Changhai metamorphic supracrustal sequence in the Jiao–Liao–Ji Belt, southeast Liaoning Province, northeast China
TL;DR: The Changhai metamorphic supracrustal rocks, located in the eastern part of the Jiao-Li-Ji Belt in the North China Craton (NCC), are composed mainly of various garnet-mica schists, along with minor quartzites and marbles.
Journal ArticleDOI
Provenance, tectonic setting and source-area weathering of Mesoproterozoic Kaimur Group, Vindhyan Supergroup, Central India
Meenal Mishra,Shinjana Sen +1 more
TL;DR: The geochemical signatures corroborate their deposition in a subsiding foreland basin over Bundelkhand craton with provenance from south, south westerly Chotanagpur granite gneiss.
Book ChapterDOI
Petrological and Geochemical Constraints on Provenance, Paleoweathering, and Tectonic Setting of Clastic Sediments From the Neogene Lambir and Sibuti Formations, Northwest Borneo
TL;DR: The petrography and geochemistry of clastic sediments from the Neogene Lambir and Sibuti Formations, Northwest Borneo, were investigated to infer the provenance and tectonic setting.
Journal ArticleDOI
Geochemistry of Neogene sedimentary rocks from Borneo Basin, East Malaysia: Paleo-weathering, provenance and tectonic setting
Ramasamy Nagarajan,Priyadarsi D. Roy,M.P. Jonathan,Rufino Lozano,Franz L. Kessler,Mohan Viswanathan Prasanna +5 more
TL;DR: In this article, multi-element geochemistry and mineralogy are used to characterize the chemical composition, degree of paleo-weathering, provenance and tectonic settings of the Neogene sedimentary rocks of Borneo Basin of east Malaysia.
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