SediGraph technique

Coakley, John P.; Syvitski, James P. M.

doi:10.1017/cbo9780511626142.013

Cited by 79 publications

(48 citation statements)

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“…The granulometric composition data correspond well to those of the loess from drilling cores obtained in the surrounding area [23]. However, it is assumed that the percentage of the clay fraction is slightly overestimated at the expense of silt due to the sedigraph technique [28]. XRD analysis revealed the following major mineral constituents: quartz, muscovite/illite and plagioclase.…”

Section: Physicochemical Propertiessupporting

confidence: 61%

Cation exchange capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia

et al. 2013

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The adsorption properties in terms of cation exchange capacity and their relation to the soil and sediment constituents (clay minerals, Fe-, Mn-, and Al-oxyhydroxides, organic matter) were investigated in loess, soil-loess transition zone, and soil at four loess-soil sections in North-Western Croatia. Cation exchange capacity of the bulk samples, the samples after oxalate extraction of Fe, Mn and Al, and after removal of organic matter, as well as of the separated clay fraction, was determined using copper ethylenediamine. Cation exchange capacity (pH∼7) of the bulk samples ranges from 5 to 12 cmolc/kg in soil, from 7 to 15 cmolc/kg in the soil-loess transition zone, and from 12 to 20 cmolc/kg in loess. Generally, CEC values increase with depth. Oxalate extraction of Fe, Mn, and Al, and removal of organic matter cause a CEC decrease of 3–38% and 8–55%, respectively, proving a considerable influence of these constituents to the bulk CEC values. In the separated clay fraction (<2 μm) CEC values are up to several times higher relative to those in the bulk samples. The measured CEC values of the bulk samples generally correspond to the clay mineral content identified. Also, a slight increase in muscovite/illite content with depth and the vermiculite occurrence in the loess horizon are concomitant with the CEC increase in deeper horizons, irrespective of the sample pretreatment.

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Section: Physicochemical Propertiessupporting

confidence: 61%

Cation exchange capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia

et al. 2013

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“…At UCSB, samples were reacted with orthophosphoric acid at 90øC with an on-line automated carbonate CO2 preparation device, and the evolved CO2 was analyzed using a Finnigan MAT 251 light stable isotope mass spectrometer. Grain-size analyses were performed on 5 cm 3 samples at 1-10-cm intervals using a SediGraph 5100 particle size analyzer, which employs X-ray attenuation to determine the settling rate for dispersed sediments [Coakley and Syvitski, 1991;Behl, 1995]. The noncarbonate, organic-free siliciclastic mud fraction (<63 gm) was separated from each sample and analyzed according to the procedure described by Behl [1995] and Brown and Kennett [1998].…”

mentioning

confidence: 99%

Marine evidence for episodic Holocene megafloods in North America and the northern Gulf of Mexico

Brown¹,

Kennett²,

Ingram³

1999

Paleoceanography

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“…However the results of the SediGraph 5100 can also be directly compared to those obtained by the standard mechanical dry-sieve-shaking and pipette methods used in previous surface sediment surveys (Coakley and Syvitski, 1991). A general fining upward of sediments is well documented in the gravity cores analyzed in this study.…”

Section: Discussionmentioning

confidence: 62%

“…Grain-size analyses were performed for all samples, surface and sub-surface, with a SediGraph model 5100ET for fine grain samples (Coakley and Syvitski, 1991), and 180-cm settling tube for coarse samples and on samples over 15-cm depth intervals in the gravity cores.…”

Section: Laboratorymentioning

confidence: 99%

Sediment Accumulation in Sepetiba Bay (Brazil) During the Holocene: A Reflex of the Human Influence

Borges¹,

Nittrouer²

2016

J. Sed. Env.

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Citation:Borges, H.V., Nittrouer, C.A., 2016. Sediment accumulation in Sepetiba Bay (Brazil) during the Holocene: A reflex of the human influence. Journal of Sedimentary Environments, 1(1): 90-106. AbstractThe nature of sedimentation and sediment accumulation rates in Sepetiba Bay, Brazil were interpreted from grain-size patterns, natural radiochemical distributions and seismic stratigraphy. The grain-size analyses showed progressive upward fining of sediment in cores, and a higher percentage of clay in surficial deposits in 1996 than observed during a previous spatial survey in the 1970s. Based on 210 Pb geochronology, accumulation rates range from 0.37 cm yr-1 to 2.0 cm yr -1 for the last hundred years. In contrast, seismic stratigraphy indicates a range from 0.01 to 0.17 cm yr -1 over the last 7000 years. Particularly high accumulation rates are found in the northeast part of the bay, and, as a consequence of these high rates, the shoreline in the northern part of the bay prograded approximately 400 m in the last 100 years. An apparent increase in accumulation rates and a tendency for deposits to fine upward over the last ~100 years are attributed to human disturbance and soil erosion inland, which have been accelerated with economic development since the late 1970s.

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SediGraph technique

Cited by 79 publications

References 0 publications

Cation exchange capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia

Cation exchange capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia

Marine evidence for episodic Holocene megafloods in North America and the northern Gulf of Mexico

Sediment Accumulation in Sepetiba Bay (Brazil) During the Holocene: A Reflex of the Human Influence

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