1987 Compilation of Elemental Concentration Data for USGS BHVO‐1, MAG‐1, QLO‐1, RGM‐1, SCo‐1, SDC‐1, SGR‐1 and STM‐1

Gladney, Ernest S.; Roelandts, Iwan

doi:10.1111/j.1751-908x.1988.tb00053.x

Cited by 168 publications

(85 citation statements)

References 16 publications

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“…Marine sediment reference standard MAG-1 (U.S. Geological Survey) was repeatedly digested. Measured values were within 5% of the certified ranges (Gladney and Roelandts, 1987) as presented in detail in Appendix 2. Precision of ICP-AES analyses was better than 5% for the measured elements (also Appendix 2).…”

Section: Total Digestionssupporting

confidence: 60%

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Plewa

Meggers

Kuhlmann

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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a b s t r a c tOne hundred and twenty-eight surface-sediment samples collected off North-West Africa were studied geochemically to detect the expressions of different meridional climate regimes and zonal productivity gradients in the surface sediments. This geochemical multi-tracer approach, coupled with additional information on the bulk carbonate and TOC contents makes it possible to characterise the sedimentological regime in detail. Typical terrigenous elements like Al, K and Fe mirror the importance of the humid (fluvial) influence in the north of the study area and the dominance of aeolian input in the south. Furthermore, the distributions of Ti and Fe in the surface sediments serve as tracers for the supply of eolian volcanic material from the Canary Islands. The spatial variability of the TOC contents in the surface sediments closely follows the ocean surface productivity patterns, whereas the CaCO 3 contents are mainly controlled by dilution with terrigenous matter. The potential productivity proxy Ba is not a reliable tracer for productivity in this region, since it is mainly supplied by terrigenous input (coupled with aluminosilicates).

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Section: Total Digestionssupporting

confidence: 60%

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Plewa

Meggers

Kuhlmann

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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“…They were measured after every ten samples to check for instrument drift. USGS standards QLO-1, RGM-1, SCo-1, BHVO-1, and SDC-1 [Abbey, 1983;Gladney and Roelandts, 1988;Govindaraju, 1994;Flanagan, 1976] were also analyzed and used to routinely correct measurements.…”

Section: Methodsmentioning

confidence: 99%

Constraints on mineralization, fluid‐rock interaction, and mass transfer during faulting at 2–3 km depth from the SAFOD drill hole

et al. 2009

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[1] Mineralogical and geochemical changes in mudrock cuttings from two segments of the San Andreas Fault Observatory at Depth (SAFOD) drill hole (3066-3169 and 3292-3368 m measured depth) are analyzed in this study. Bulk rock samples and hand-picked fault-related grains characterized by polished surfaces and slickensides were investigated by X-ray diffraction, electron microscopy, and geochemical analysis. The elemental changes in fault-related grains along the sampled San Andreas Fault are attributed to dissolution of detrital grains (particularly feldspar and quartz) and local precipitation of illite-smectite and/or chlorite-smectite mixed layers in fractures and veins. Assuming ZrO 2 and TiO 2 to be immobile elements, systematic differences in element concentrations show that most of the elements are depleted in the fault-related grains compared to the wall rock lithology. Calculated mass loss between the bulk rock and picked fault rock ranges from 17 to 58% with a greater mass transport in the shallow trace of the sampled fault that marks the upper limit the fault core. The relatively large amount of element transport at temperatures of $110-114°C recorded throughout the core requires extensive fluid circulation during faulting. Whereas dissolution/precipitation may be partly induced by the disequilibrium between fluids and rocks during diagenetic processes, stress-induced dissolution at grain contacts is proposed as the main mechanism for extensive mineral transformation in the fault rocks and localization of neomineralization along grain interface slip surfaces.

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“…A 14 C-depleted standard, hexane soot (Akhter et al 1985;Goldberg 1985;Hammes et al 2007) was also used to estimate modern C ex . Environmental BC standards that contained a silicate and metal matrix, including urban dust aerosol NIST Standard Reference Material (SRM 1649a) (National Institute of Standards and Technology 2001;Masiello et al 2002), NIST Standard Reference Material marine sediment (SRM 1941b), and US Geological Survey Green River Shale (Abbey 1983; Gladney and Roelandts 1988;Govindaraju 1994) were used to estimate modern C ex . To observe the matrix effect in marine sediments samples, wood char was added to SRM 1941b that had previously been baked in a muffle furnace for 2 hr at 550 C to remove organic carbon.…”

Section: Black Carbon Standardsmentioning

confidence: 99%

Extraneous Carbon Assessments in Radiocarbon Measurements of Black Carbon in Environmental Matrices

2013

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ABSTRACT. Extraneous carbon (C ex ) added during chemical processing and isolation of black carbon (BC) in environmental matrices was quantified to assess its impact on compound specific radiocarbon analysis (CSRA). Extraneous carbon is added during the multiple steps of BC extraction, such as incomplete removal of solvents, and carbon bleed from the gas chromatographic and cation columns. We use 2 methods to evaluate the size and  14 C values of C ex in BC in ocean sediments that require additional pretreatment using a cation column with the benzene polycarboxylic acid (BPCA) method. First, the direct method evaluates the size and  14 C value of C ex directly from the process blank, generated by processing initially empty vials through the entire method identically to the treatment of a sample. Second, the indirect method quantifies C ex as the difference between processed and unprocessed (bulk)  14 C values in a variety of modern and 14 C-free or "dead" BC standards. Considering a suite of hypothetical marine sedimentary samples of various sizes and  14 C values and BC Ring Trial standards, we compare both methods of corrections and find agreement between samples that are >50 µg C. Because C ex can profoundly influence the measured  14 C value of compound specific samples, we strongly advocate the use of multiple types of process standards that match the sample size to assess C ex and investigate corrections throughout extensive sample processing.

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1987 Compilation of Elemental Concentration Data for USGS BHVO‐1, MAG‐1, QLO‐1, RGM‐1, SCo‐1, SDC‐1, SGR‐1 and STM‐1

Cited by 168 publications

References 16 publications

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Constraints on mineralization, fluid‐rock interaction, and mass transfer during faulting at 2–3 km depth from the SAFOD drill hole

Extraneous Carbon Assessments in Radiocarbon Measurements of Black Carbon in Environmental Matrices

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