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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Petrography, geochemistry, and Nd isotope systematics of metaconglomerates and matrix-rich metasedimentary rocks: implications for the provenance and tectonic setting of the Labrador Trough, Canada
TL;DR: The New Quebec Orogen consists of a supracrustal belt that was reworked when the Superior Craton collided with the Core Zone terrane during the Paleoproterozoic Trans-Hudson Orogeny as mentioned in this paper.
Journal ArticleDOI
Geochemical Evidence for Provenance, Tectonic Settings and Presence ofGas Hydrate in Mud Volcano Sediments of Andaman Islands
TL;DR: In this article, the compositional immaturity of the analyzed mud volcano sediments is typical of sub ducted-related environments, and their SiO2/Al2O3 and K2O/Na2O ratios reflect their oceanic island arc settings.
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Metamorphism, geochemistry, and carbon source on sedimentary-metamorphic graphite deposits in eastern Shandong, China
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Tectonic Evolution of the West Bogeda: Evidences from Zircon U-Pb Geochronology and Geochemistry Proxies, NW China
Yalong Li,Wei Yue,Xun Yu,Xiangtong Huang,Zongquan Yao,Jiaze Song,Xin Shan,Xinghe Yu,Shouye Yang +8 more
TL;DR: In this article, detrital zircon U-Pb geochronology and whole-rock geochemistry of the Permian sandstone samples were used to decipher the provenance and tectonic evolution of the West Bogeda Shan.
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The Origin and Tectonic Setting of Precambrian Greywacke of Ribandar‐Chimbel, Goa, India: Petrological and Geochemical Evidence
TL;DR: The greywacke of Ribandar-Chimbel belonging to the Sanvordem Formation of the Goa Group, India, has been studied for petrography and analyzed for major trace elements.
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