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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Petrography and chemistry of the bed sediments of the Red River in China and Vietnam: Provenance and chemical weathering
TL;DR: In this paper, the Red (Hong) River bed sediments were collected from its tributaries and main channel and reported the petrographic point counts of framework grains and major oxide compositions as well as organic and inorganic carbon contents.
Journal ArticleDOI
Pressure-temperature-deformation-time constraints on the South Tibetan Detachment System in the Garhwal Himalaya (NW India)
Salvatore Iaccarino,Salvatore Iaccarino,Chiara Montomoli,Rodolfo Carosi,Chiara Montemagni,H. J. Massonne,Antonio Langone,Arvind K. Jain,Dario Visonà +8 more
TL;DR: In this article, a detailed multidisciplinary study integrating field-based, microstructural, petrographic and geochronological analyses was carried out on rocks along the Dhauli Ganga valley, in the Garhwal Himalaya (NW India).
Journal ArticleDOI
Tight Rock Wettability and Its Relationship to Other Petrophysical Properties: A Montney Case Study
TL;DR: In this paper, the authors measured and analyzed spontaneous imbibition of water and oil into five twin core plugs from the cores of a well drilled in the Montney Formation, an unconventional oil and gas play in the Western Canadian Sedimentary Basin.
Journal ArticleDOI
Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm–Nd, Pb–Pb and SHRIMP data
Malte Drobe,Mónica G. López de Luchi,André Steenken,Klaus Wemmer,Rudolf Naumann,Robert Frei,Siegfried Siegesmund +6 more
TL;DR: In this article, the SHRIMP data from the Sierras de Chepes, the Siersras de Cordoba, the Sierra Norte and the San Luis Formation in the Sierra de San Luis, was used to unravel the provenance and the geodynamic history of the Eastern Sierra Pampeanas, Central Argentina.
Journal ArticleDOI
Influence of glaciation on mechanisms of mineral weathering in two high Arctic catchments
TL;DR: In this paper, the effect of glaciation on mineral weathering, the stream water chemistry and the bacterial community composition were analyzed in two catchments containing nominally identical sedimentary formations but which differed in the extent of glaciated.
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