Journal ArticleDOI
Geochemical classification of terrigenous sands and shales from core or log data
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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
Petrogenesis of the meta-igneous rocks of the Sierra El Arco and coeval magmatic rocks in Baja California: Middle Jurassic-Early Cretaceous (166-140 Ma) island arc magmatism of NW México
Manuel Contreras-López,Luis Alberto Delgado-Argote,Bodo Weber,Xóchitl Guadalupe Torres-Carrillo,Dirk Frei,Doris Karina Gómez-Alvarez +5 more
TL;DR: The Jurassic-Early Cretaceous Vizcaino and Alisitos terranes are juxtaposed in the central part of the Baja California Peninsula, Mexico as mentioned in this paper.
Journal ArticleDOI
Complete metamorphic cycle and long‐lived anatexis in the c. 2.1 Ga Mistinibi Complex, Canada
Antoine Godet,Carl Guilmette,Loïc Labrousse,Loïc Labrousse,Donald W. Davis,Matthijs Smit,Jamie Cutts,Marc-Antoine Vanier,Isabelle Lafrance,Benoit Charette +9 more
Journal ArticleDOI
Provenance of upper Paleozoic siliciclastics rocks from two high-latitude glacially influenced intervals in Bolivia
Katarzyna Kołtonik,Katarzyna Kołtonik,Peter E. Isaacson,Agnieszka Pisarzowska,Agnieszka Pisarzowska,Mariusz Paszkowski,Carita Augustsson,Marek Szczerba,Jiří Sláma,Bartosz Budzyń,Michał Stachacz,Wojciech Krawczyński +11 more
TL;DR: The Toregua Formation in northern Bolivia comprises a continuous succession of sedimentary rocks containing two glacial intervals related to the onset of the Late Paleozoic Ice Age (LPIA) as mentioned in this paper.
Journal ArticleDOI
Petrophysical, facies and mineralogical-geochemical investigations of Rotliegend sandstones from the Altmark natural gas field in Central Germany
Dieter Pudlo,Daniel Albrecht,Leonhard Ganzer,Reinhard Gaupp,Bernd Kohlhepp,Robert Meyer,Viktor Reitenbach,Joachim Wienand +7 more
TL;DR: In this article, a collaborative study of the Universities Jena and Clausthal and the GDF SUEZ E&P Deutschland within the framework of the R&D program CLEAN was investigated by sedimentological, mineralogical, geochemical and petrophysical means.
Dissertation
Geodynamic evolution and genesis of the Cannington Broken Hill-type Ag-Pb-Zn deposit, Mount Isa Inlier, Queensland
TL;DR: The Cannington Ag-Pb-Zn mine is located in the southeastern area of the Palaeoto Mesoproterozoic Mount Ise lnlier, northwest Queensland as discussed by the authors.
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