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Journal Article

The application of quartile deviation-median diameter curves to the interpretation of sedimentary rocks Available to Purchase

ANTONY T. BULLER, JOHN McMANUS
Published: 01 February 1974
Journal of the Geological Society (1974) 130 (1): 79–83.
DOI: https://doi.org/10.1144/gsjgs.130.1.0079
..., Porosity, Permeability Bull Am Assoc Petrol Geologists 1971 55 2194 2224 The application of quartile deviation-median diameter curves to the interpretation of sedimentary rocks ANTONY T. BULLER & JOHN McMANUS SUMMARY Textural differences between present-day sedi- ments collected from fluviatile...
View PDF for article title, The application of quartile deviation-<span class="search-highlight">median</span> <span class="search-highlight">diameter</span> <span class="search-highlight">curves</span> to the interpretation of sedimentary rocks
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Journal Article

LASER SHADOW ANALYSIS OF PARTICLE-SIZE DISTRIBUTION OF MONTMORILLONITES IN AQUEOUS SUSPENSIONS Available to Purchase

S. Yariv, I. Lapides
Published: 01 February 2003
Clays and Clay Minerals (2003) 51 (1): 23–32.
DOI: https://doi.org/10.1346/CCMN.2003.510103
... into the interlayer of the tactoid (swelling) and into the interparticle space of the floc. Dilution and/or shaking have almost no effect on the particle-size distribution curves of Ca- and Mn-montmorillonite or on the diameters of the largest, the median and the mean particles, but the curves of Na...
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View PDF for article title, LASER SHADOW ANALYSIS OF PARTICLE-SIZE DISTRIBUTION OF MONTMORILLONITES IN AQUEOUS SUSPENSIONS
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Grain size distribution curves of glass beads based on their median diameters (D50).

Grain size distribution curves of glass beads based on their median diamete... Available to Purchase

Published: 01 August 2010
Fig. 1. Grain size distribution curves of glass beads based on their median diameters ( D 50 ).
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Histograms and cumulative curves of the grain size composition of the Chukchi Sea bottom sediments from the cores: 1 – LV83-1-2, 2 – LV77-5-2, 3 – b16. Md is the median diameter of particles, Q1 is the first quartile, and Q3 is the third quartile.

Histograms and cumulative curves of the grain size composition of the Chukc... Available to Purchase

Published: 01 March 2025
Fig. 3. Histograms and cumulative curves of the grain size composition of the Chukchi Sea bottom sediments from the cores: 1 – LV83-1-2, 2 – LV77-5-2, 3 – b16. M d is the median diameter of particles, Q1 is the first quartile, and Q3 is the third quartile.
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Comparison of seven normalized frequency curves showing particle-size distribution with respect to phi grain diameter. Median values shift from as much as 30–40 µm (samples at 22.7 cal k.y. B.P. and 40.0 cal k.y. B.P.) to as low as 10–20 µm (sample 14.2 cal k.y. B.P.).

Comparison of seven normalized frequency curves showing particle-size distr... Open Access

Published: 27 February 2024
Figure 18. Comparison of seven normalized frequency curves showing particle-size distribution with respect to phi grain diameter. Median values shift from as much as 30–40 µm (samples at 22.7 cal k.y. B.P. and 40.0 cal k.y. B.P.) to as low as 10–20 µm (sample 14.2 cal k.y. B.P.).
Journal Article

Petrophysical Characteristics and Facies of Carbonate Reservoirs: The Red River Formation (Ordovician), Williston Basin Available to Purchase

Lillian Hess Tanguay, Gerald M. Friedman
Journal: AAPG Bulletin
Published: 01 March 2001
AAPG Bulletin (2001) 85 (3): 491–523.
DOI: https://doi.org/10.1306/8626C933-173B-11D7-8645000102C1865D
... saturation by 1000 psia during mercury porosimetry, 0.1 to 0.65 μm average pore-throat radius (APR), 0.18 to 1 μm median pore-throat radius (MPR), 0.6 to 3.6 μm MTER, and 46 to 63% RE. A positive correlation occurs between AP and RE where, as porosity increases to 21%, the RE increases to 64%. Pore diameters...
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View PDF for article title, Petrophysical Characteristics and Facies of Carbonate Reservoirs: The Red River Formation (Ordovician), Williston Basin
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Journal Article

Selective grain entrainment by a current from a bed of mixed sizes; a reanalysis Available to Purchase

Paul D. Komar
Published: 01 March 1987
Journal of Sedimentary Research (1987) 57 (2): 203–211.
DOI: https://doi.org/10.1306/212F8AE4-2B24-11D7-8648000102C1865D
... at the median diameter of the size distribution. Due to this crossover, the coarser size fractions of the distribution require lower-flow stresses for their entrainment than if they formed uniform beds, while the finer-size fractions require higher stresses than uniform beds. With deposits having medians...
View PDF for article title, Selective grain entrainment by a current from a bed of mixed sizes; a reanalysis
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Observed trends. A) Density. B) Raw species numbers for 9-cm-diameter cores. C) Raw species numbers for 16-cm-diameter cores. D) Diversity, expressed as “effective number of species”, exp(H), in the mollusk cores from the four sampling stations. Gray shadows of diversity curves represent lower and upper 95% confidence intervals, dotted vertical lines represent the median of each station, and horizontal lines across the graphs mark phase boundaries.

Observed trends. A ) Density. B ) Raw species numbers for 9-cm-diameter c... Open Access

Published: 01 March 2019
Fig. 11.— Observed trends. A ) Density. B ) Raw species numbers for 9-cm-diameter cores. C ) Raw species numbers for 16-cm-diameter cores. D ) Diversity, expressed as “effective number of species”, exp(H), in the mollusk cores from the four sampling stations. Gray shadows of diversity curves
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(a) Measured ratio of the soil gas diffusion coefficient at −100 cm H2O matric potential to the gas diffusion coefficient in free air (Dp,pF2/D0) as a function of soil air content at −100 cm H2O (εpF2); (b) fitted αpF2 values from Eq. [11] for each soil as a function of the average particle size (D50), with the dotted line representing the fitted curve for the measured data sets; and (c) the calculated effective pore diameter for gas transport (deff,pF2) (Eq. [14]), as a function of D50 at different bulk densities (ρb), with the black dotted line representing the fitted curve for median pore diameter (d50) (from Fig. 1c).

(a) Measured ratio of the soil gas diffusion coefficient at −100 cm H 2 O m... Available to Purchase

Published: 01 November 2009
the fitted curve for median pore diameter ( d 50 ) (from Fig. 1c ).
Journal Article

Measures for describing the size distribution of sediments Available to Purchase

Douglas Lamar Inman
Published: 01 September 1952
Journal of Sedimentary Research (1952) 22 (3): 125–145.
DOI: https://doi.org/10.1306/D42694DB-2B26-11D7-8648000102C1865D
... are computed from five percentile diameters obtained from the cumulative size-frequency curve of a sediment. They include the mean (or median) diameter, standard deviation, kurtosis, and two measures of skewness, the second measure being sensitive to skew properties of the "tails" of the sediment distribution...
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Predicted (a) breakthrough curves and (b) retention profiles for the uniform model with colloid filtration theory when sticking efficiency α = 0.05, microbe diameter dm = 1000 nm, and Darcy velocity q = 0.01, 0.05, 0.1, 0.25, 0.5, and 1 cm min−1. The median grain size d50 was determined from q using Eq. [18]. See Table 1 for all parameter values.

Predicted (a) breakthrough curves and (b) retention profiles for the unifor... Available to Purchase

Published: 01 April 2017
Fig. 3. Predicted (a) breakthrough curves and (b) retention profiles for the uniform model with colloid filtration theory when sticking efficiency α = 0.05, microbe diameter d m = 1000 nm, and Darcy velocity q = 0.01, 0.05, 0.1, 0.25, 0.5, and 1 cm min −1 . The median grain size d 50
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Figure 7. Curve of allometric disparity during the Pliensbachian–Toarcian interval (A), measured as the average distance to isometry (see text), and curves of average adult size (B), measured as mean (black squares) and median (open circles) diameters of adult phragmocone. Although stable during the Pliensbachian, the average distance to isometry increases during the first part of the Toarcian (Tenuicostatum–Variabilis) and then declines (Variabilis–Aalensis). This suggests the succession of two heterochronoclines: a peramorphocline followed by a paedomorphocline. The size pattern tends to display coincident variations. Error bars are bootstrapped standard errors (1000 replicates). Chronozone abbreviations are as in Figure 1.

F igure 7. Curve of allometric disparity during the Pliensbachian–Toarcian... Available to Purchase

Published: 01 August 2011
F igure 7. Curve of allometric disparity during the Pliensbachian–Toarcian interval (A), measured as the average distance to isometry (see text), and curves of average adult size (B), measured as mean (black squares) and median (open circles) diameters of adult phragmocone. Although stable during
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Theoretical Rayleigh wave dispersion curves for the “best” (i.e., lowest misfit) 1,000 velocity models obtained from the inversion analysis at Hagley Park using (a) normally dispersive parameterization (Analysis 1) and (b) parameterization that permits velocity reversals within the Bromley, Heathcote, and Shirley Formations (Analysis 2). The three distinct bands of curves represent the fundamental (R0), first-higher (R1), and second-higher (R2) Rayleigh modes. Also highlighted is the theoretical dispersion curve for the median velocity profile obtained from the “best” 1,000 profiles. Experimental dispersion data with wavenumbers below the array resolution limit (kmin/2; Wathelet et al. 2008) may be adversely influenced by limitations of the largest (400-m-diameter) array.

Theoretical Rayleigh wave dispersion curves for the “best” (i.e., lowest mi... Available to Purchase

Published: 01 May 2018
the Bromley, Heathcote, and Shirley Formations (Analysis 2). The three distinct bands of curves represent the fundamental (R0), first-higher (R1), and second-higher (R2) Rayleigh modes. Also highlighted is the theoretical dispersion curve for the median velocity profile obtained from the “best” 1,000 profiles
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Experimental dispersion data and theoretical dispersion curves for the 1,000 “best” (i.e., lowest misfit) ground models at all 14 test sites (test site locations are shown in Figure 2 and detailed in Table 1). Also shown are theoretical dispersion curves for the median ground model and the R0, R1, and R2 modes for all ground models. The R3 and R4 modes are shown for all models at Burnside Park (BSP). Experimental dispersion data with wavenumbers below the array resolution limit (kmin/2; Wathelet et al. 2008) may be adversely influenced by limitations of the largest (400-m-diameter) array.

Experimental dispersion data and theoretical dispersion curves for the 1,00... Available to Purchase

Published: 01 May 2018
Figure 7. Experimental dispersion data and theoretical dispersion curves for the 1,000 “best” (i.e., lowest misfit) ground models at all 14 test sites (test site locations are shown in Figure 2 and detailed in Table 1 ). Also shown are theoretical dispersion curves for the median ground model
Journal Article

Grain-Size Distribution and Reservoir-Rock Characteristics Available to Purchase

John C. Griffiths
Journal: AAPG Bulletin
Published: 01 February 1952
AAPG Bulletin (1952) 36 (2): 205–229.
DOI: https://doi.org/10.1306/3D9343EE-16B1-11D7-8645000102C1865D
... low-rank graywackes of South Trinidad, B.W.I., the amount of favorable oil-reservoir rocks in the 1,000 cubic miles of Miocene sediments may be recognized as about 12% on the basis of their peculiar grain-size distribution. Similarly, by plotting size (median diameter) against sorting (phi percentile...
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Particle size distributions from site NGHP-02-09 showing the dependence of gas hydrate saturation (Sh) on the content of clay (percentage of particles less than 4  μm in diameter). The clay content can be more important than the median grain size (percent finer = 50, d50) in limiting Sh, as evidenced by comparing R2 and R3. Seal (the black curve): 90.15 mbsf, 36.6% clay, d50=6.9  μm, Sh=0%. R1 (the dashed red curve): 201.02 mbsf, 15.4% clay, d50=58.9  μm, Sh=11%. R2 (the solid red curve): 257.26 mbsf, 0.3% clay, d50=1112.9  μm, Sh=79%. R3 (the dotted red curve): 232.03 mbsf, 4.7% clay, d50=1695.2  μm, Sh=41%. Data are from Waite et al. (2019a, 2019b).

Particle size distributions from site NGHP-02-09 showing the dependence of ... Available to Purchase

Published: 02 March 2020
Figure 11. Particle size distributions from site NGHP-02-09 showing the dependence of gas hydrate saturation ( S h ) on the content of clay (percentage of particles less than 4    μ m in diameter). The clay content can be more important than the median grain size (percent
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Maximum transversal diameter (MTD) versus the maximal length (maxL) of Uvigerina peregrina (all three populations of Figure 3) in comparison to a) Uvigerina peregrina parva, b) Uvigerina celtica n. sp., and c) Uvigerina pigmea. The curves display logarithmical regression lines (Uvigerina peregrina: MTD =− 729.3 + 402.72 * log (maxL), R: 0.89. Uvigerina peregrina parva: MTD = −670.8 + 361.75 * log (maxL), R: 0.91. Uvigerina celtica n. sp.: MTD = −484.5 + 284.09 * log (maxL), R: 0.81. Uvigerina pigmea: MTD = −526.8 + 300.33 * log (maxL), R: 0.89). d) Frequency distribution box plots of the maxL/MTD ratios of the species. Bars: 10th and 90th percentile, boxes: lower quartile, median and upper quartile, asterisk: mean value, cirles: outliers. The number of observations is given on top or bottom of the diagrams.

Maximum transversal diameter (MTD) versus the maximal length (maxL) of Uvi... Available to Purchase

Published: 01 October 2006
F igure 4. Maximum transversal diameter (MTD) versus the maximal length (maxL) of Uvigerina peregrina (all three populations of Figure 3 ) in comparison to a) Uvigerina peregrina parva , b) Uvigerina celtica n. sp., and c) Uvigerina pigmea . The curves display logarithmical regression
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Phase velocity (Vph) and anisotropy of the Rayleigh‐wave fundamental mode at (a) 1.0, (b) 2.0, and (c) 3.0 Hz. Each color circle represents the Vph result of a station group (each contains 15–20 stations within a 2.5 km diameter circle). The black lines with white borders indicate the fast directions, where the lengths are proportional to the degree of anisotropy (percentage of velocity variation). (a) The regional maximum shear‐stress (SHmax) is marked by the dashed line on the upper left (Alt and Zoback, 2017). Locally mapped faults are marked by the black thick lines (Marsh and Holland, 2016). The black small circles in the background are individual stations. The insets show how Vph and anisotropy are measured at the location marked by the white ×. We bin the DBF Vph measurements (black small dots) every 6° to obtain the red big dots with error bars indicating the standard deviation in each bin. The black curves are the best fit for a cosine function. The peak (vertical dashed line) and the amplitude of the cosine function correspond to the fast direction and the degree of anisotropy, respectively. The median of the cosine function is the Vph for this station group. The color version of this figure is available only in the electronic edition.

Phase velocity ( V ph ) and anisotropy of the Rayleigh‐wave fundamen... Available to Purchase

Published: 24 February 2025
big dots with error bars indicating the standard deviation in each bin. The black curves are the best fit for a cosine function. The peak (vertical dashed line) and the amplitude of the cosine function correspond to the fast direction and the degree of anisotropy, respectively. The median
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Figure11—A distance of 6 mm on these photographs is equivalent to the length (in μm) noted in the parentheses. 1a, 1b–9, Various protoentactinids. 1a, 1b, GSC-125568 (GP25G-1), (40, 14.2), outermost branches are curved and fused at their ends. 2a, 2b, GSC-125569 (BPN82-4-7), (40, 16.6), most outermost branches are fused with one another. 3a, 3b, GSC-125570 (GP26A-29), (50, 22.2), numerous spinules, developed on the branches, are connected forming a fused shell wall. 4, GSC-125571 (GP25D-8), (66.6), note the very large open spherical shell, no branches are fused. 5, GSC-125572 (GP25D-4), (40), all outermost branches are long and directed radially outward. 6, GSC-125573 (GP25B2-50), (43.5), very long outermost branches. 7, GSC-125574 (GP25B2-53), (40), all branches are of similar diameter. 8, GSC-125575 (GP25A2-12), (43.5), showing the spicule system with a long median bar. 9, GSC-125576 (GP25D-6), (43.5), long outermost branches are strongly curved with kinks and flexures visible. 10a, 10b,Ramuspiculum sp. A, GSC-125577 (BPN82-4-2), (25, 15.1). 11–14,Palaeospiculum multifurcatum n. sp. 11, GSC-125578 (GP26A-50), (28.5). 12, GSC-125579 (BPN94-1), (22.2). 13, Holotype, GSC-125580 (GP26A-40), (33.3). 14, GSC-125581 (GP26A-35), (33.3). 15,Palaeospiculum tetractinum n. sp., holotype, GSC-125582 (SP10-3), (25)

Figure 11 —A distance of 6 mm on these photographs is equivalent to the le... Available to Purchase

Published: 01 May 2005
(GP25D-4), (40), all outermost branches are long and directed radially outward. 6, GSC-125573 (GP25B2-50), (43.5), very long outermost branches. 7, GSC-125574 (GP25B2-53), (40), all branches are of similar diameter. 8, GSC-125575 (GP25A2-12), (43.5), showing the spicule system with a long median
Journal Article

Quartile deviation-median diameter analysis of surface and core sediments from Start Bay Available to Purchase

JOHN McMANUS
Published: 01 February 1975
Journal of the Geological Society (1975) 131 (1): 51–56.
DOI: https://doi.org/10.1144/gsjgs.131.1.0051
...JOHN McMANUS Abstract Quartile deviation-median diameter analysis is sufficiently sensitive to permit sectors of bed characterized by wave or current dominant sediments to be recognized. These may be related to modern conditions or to erosion of buried sub-recent deposits which cores indicate exist...
View PDF for article title, Quartile deviation-<span class="search-highlight">median</span> <span class="search-highlight">diameter</span> analysis of surface and core sediments from Start Bay
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