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
Geochemistry and provenance of stream sediments of the Ganga River and its major tributaries in the Himalayan region, India
TL;DR: In this article, the major, trace and REE compositions of the Ganga River and its tributaries in the Himalaya were examined to study the weathering of the Himalayan catchment region and to determine the dominant source rocks to the sediments in the Gangetic Plains.
Journal ArticleDOI
Age constraints on crystal-tuff from the Espinhaço Supergroup — Insight into the Paleoproterozoic to Mesoproterozoic intracratonic basin cycles of the Congo–São Francisco Craton
Felipe Guadagnin,Felipe Guadagnin,Farid Chemale,Farid Chemale,A.J.C. Magalhães,Ana Santana,Ana Santana,Ivo Dussin,Lucy Takehara +8 more
TL;DR: In this article, the Tombador Formation has been used to define the main sedimentary sources of the Archean, Paleoproterozoic and Mesoameric Eras, and the available zircon data defined three first-order intracratonic basinal cycles including the Lower (Statherian), Middle (Calymmian) and Upper (Stenian-early Tonian) Espinhaco basins.
Journal ArticleDOI
Geochemistry of Rewalsar Lake sediment, Lesser Himalaya, India: implications for source-area weathering, provenance and tectonic setting
Brijraj K. Das,Birgit-Gaye Haake +1 more
TL;DR: In this article, the major, trace and rare earth element (REE) chemistry of fresh-water lake sediments, stituated in the middle Siwalik Formation (Pliocene), have been investigated.
Journal ArticleDOI
U–Pb LA-SF-ICP-MS zircon geochronology of the Serbo-Macedonian Massif, Greece: palaeotectonic constraints for Gondwana-derived terranes in the Eastern Mediterranean
Guido Meinhold,Guido Meinhold,Dimitrios Kostopoulos,Dirk Frei,Felix Himmerkus,Thomas Reischmann +5 more
TL;DR: In this paper, the authors show that the Pirgadikia terrane is a peri-Gondwana terrane of Avalonian origin, which was situated close to the Cadomian terranes in the Late Neoproterozoic-Early Palaeozoic, very much like the Istanbul Terrane.
Journal ArticleDOI
Provenance and weathering control on river bed sediments of the eastern Tibetan Plateau and the Russian Far East
TL;DR: This article investigated the petrography and major, trace and rare earth element compositions of the bed sediments from the large rivers draining the eastern Tibetan Plateau (ETP) including the Huang He (Yellow), Chang Jiang (Yangtze), Hong He (Red), Mekong and Salween.
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