Results 221 to 230 of about 17,011 (264)
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Statistical analyses of geochemical variables in soils of Ireland
Geoderma, 2008Abstract Geochemical variables in soils are affected by multiple factors, and different variables have different responses to these factors, causing complicated multivariate relationships between them. In this study, the relationships between a total of 45 geochemical variables in soils and in particular mineral soils of Ireland were investigated ...
Chaosheng Zhang +4 more
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Calculation and Illustration of Uncertainty in Geochemical Analyses
Journal of Geological Education, 1985The uncertainty in chemical analyses resulting from precision error should be evaluated and indicated, and error bars should be placed on analytical data when they are plotted in the various diagrams used in geochemistry. The corresponding uncertainty in the sums and quotients that are commonly used (e.g., Na2O + K2O, K/Rb, Fe/(Fe + Mg)) can be readily
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A Streamlined Workflow From Experimental Analyses to Dynamic Geochemical Modelling
SPE Europec featured at 82nd EAGE Conference and Exhibition, 2021Abstract Dynamic-geochemical model is a powerful instrument to evaluate the geochemical effects on CO2storage capacity, injectivity and long-term containment. The study objective is to apply an integrated multi-step workflow to a carbon capture and storage (CCS) candidate field (offshore), namely hereinafter H field.
Ahmed M. S. Elgendy +3 more
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Integration of Geochemical and Petrophysical Analyses for the Shilaif Formation Characterization
Abu Dhabi International Petroleum Exhibition & Conference, 2018Abstract Development of unconventional oil plays worldwide demonstrated that conventional characterization of such rocks in terms of a total porosity and total water saturation does not always provide enough information for completion and drilling decisions.
Gennady Makarychev +3 more
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Geochemical and palynological analyses of the Serikagni Formation, Sinjar, Iraq
Arabian Journal of Geosciences, 2011Serikagni Formation (lower–middle Miocene) was studied at four outcrop sections within Sinjar Anticline, Para (the western plunge), Jaddala, Sinjar, (Southern limb), and Noaniaa (Northern limb) of Sinjar Mountain, which is part of foothill zone in northwest Iraq.
Moutaz A. Al-Dabbas, Rana A. Hassan
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A graphic procedure in the geochemical interpretation of water‐analyses
Eos, Transactions American Geophysical Union, 1944This paper outlines certain fundamental principles in a graphic procedure which appears to be an effective tool in segregating analytical data for critical study with respect to sources of the dissolved constituents in waters, modifications in the character of a water as it passes through an area, and related geochemical problems.
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Precision in analytical measurements: Expected values and consequences in geochemical analyses
Fresenius' Journal of Analytical Chemistry, 1995Over the years the authors have developed an empirical formula for the relative standard deviation among laboratories (RSDR, %) as a function of concentration C, expressed as a decimal fraction: RSDR=2(1−0.5log C)≈2C(−0.1505). This formula predicts that starting with a concentration of 100% (pure materials; C=1.00), RSDR will be 2%, increasing by a ...
William Horwitz, Richard Albert
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Geochemical analyses of rocks of the Haparanda suite, northern Sweden
Geologiska Föreningen i Stockholm Förhandlingar, 1984Abstract Thirteen samples of the primorogenic Haparanda suite in Norrbotten, northern Sweden, are analysed for major elements and the trace elements Rb, Sr, Ba, Cu, Zn, Mo, Sn, Be, Nb, Y, Zr, Cr, Ni, V, F, Cl and S. The results accord with the view that the Haparanda suite is an I-type rock suite generated in a compressional environment. The Sn-content
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Geochemical Interpretation of Water Analyses from Tennessee Streams
Transactions of the American Fisheries Society, 1947Abstract The total alkalinity of unpolluted waters in Tennessee streams can be generally related to the nature of the geological formations comprising the stream beds and soil provinces. Data accumulated from 371 localities in streams which are isolated in distinct and separate geological formations show that sixteen geochemical provinces may be ...
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INDIVIDUAL FORAMINIFERAL ANALYSES: A REVIEW OF CURRENT AND EMERGING GEOCHEMICAL TECHNIQUES
Journal of Foraminiferal ResearchAbstract The trace element (TE) and isotopic composition of calcareous foraminifera has been invaluable in advancing our understanding of environmental change throughout the geological record. Whereas “bulk” geochemical techniques, typically requiring the dissolution of tens to hundreds of foraminiferal tests for a single analysis, have ...
Jennifer S. Fehrenbacher +7 more
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