Clastic grains exhibit approximately lognormal size distributions in most sedimentary rocks. These lognormal distributions are essentially random ones and reflect the fact that most processes of erosion, transportation, and deposition affect only the medians and sorting coefficients, but not the ...
GRAIN-SIZE ANALYSIS OF CHANNEL GRAVELS IN HACK AND GOODLETT'S LITTLE RIVER BASIN: A BENCHMARK FOR COMPARISON IN CENTRAL APPALACHIAN WATERSHEDS UNDERLAIN BY... TAYLOR,B Stephen 被引量: 0发表: 0年 A transferable method for the automated grain sizing of river gravels The spatial and temporal ...
GRAIN-SIZE IMAGE OF CLASTIC DEPOSITS Integrated with ecological determinations and sedimentary structure descriptions, grain-size facies maps are a means of environment analysis.doi:10.1111/j.1365-3091.1969.tb00171.xR. PASSEGAR. BYRAMJEE... R Passega,R Byramjee - 《Sedimentology》 被引量: 168发表...
Grain size is a fundamental physical property of sediments, and its parameters are crucial indicators of the provenance, transport processes, and depositional environments. However, owing to the availability of graphic and moment method choices for the d
Full size image The clastic nature of the most recent sediments in the area, i.e., the Quaternary and the Miocene sequences, enables the characterization of the clastic depositional systems using the GSD. Moreover, the study area ensures good spatial data coverage, with over 20,000 lithology...
Many models are available to fit the curve of a grain size distribution, GSD. The article lists 61 models and 33 comparative studies of models. Examples explain how to extract stratification data from split-spoon samples and how to verify whether a model respects the internal structure of the ...
Sign in to download full-size image Figure 12.27.Thin-section photomicrographs illustrating major reservoir porosity types found in Upper Jurassic reservoirs in the central Gulf Coast. (A) Primary intergranular porosity (8%) in sequence UJ III, Walker Creek Field, Columbia County, Arkansas. Ooids ...
Techniques for estimating specific yield and specific retention from grain-size data and geophysical logs from clastic bedrock aquifers. Water resources in... (1993), Techniques for estimating specific yield and specific retention from grain-size data and geophysical logs from clastic bedrock aquifers,...
(G) Compressed and cataclastically deformed, showing intense grain-size reduction. Microfractures suggest that grain size reduction is related to grain crushing, but there is also textural evidence for pressure solution.(A) Figure 4a from Karner, S.L., Chester, F.M., Kronenberg, A.K., ...
Summary values of local grain size (e.g., D84 or D50, the size at which 84% or 50% of measured b-axes are finer) have been estimated from photographs (so-called ‘photosieving’ methods) using semivariograms of image texture (e.g., Carbonneau et al., 2004, Verdú et al., 2005)...