Oxyanions in metalliferous sediments: tracers for paleoseawater metal concentrations?

Schaller, Tobias; Morford, Jennifer L.; Emerson, Steven; Feely, Richard A.

doi:10.1016/s0016-7037(99)00443-3

Cited by 35 publications

(58 citation statements)

References 55 publications

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“…This implies a significant loss of scavenged P from the distal hydrothermal sediments, provided the SEPR plume particles analysed by Feely et al (1996) between 13°33 0 and 18°40 0 S are equivalent to distal particles at 19°S. This apparent P loss from surficial sediments is similar to that reported for sediments deposited 34 km from the SEPR at $10°S (Schaller et al, 2000), but contrasts with an apparent complete retention of P beneath the Mid-Atlantic Rainbow hydrothermal plume (Edmonds and German, 2004).…”

Section: Molar P/fe Ratiossupporting

confidence: 61%

“…Thus, the source plume particles may have been particularly rich in pyrite, and therefore, oxidation of pyrite during diagenesis could potentially account for some, if not all, of the apparent loss of P in deposited SEPR sediments. Schaller et al (2000) discount the possibility that pyrite oxidation could be responsible for the 50% loss of P in deposited SEPR sediments relative to plume particles, based on the low total S contents of the deposited sediments. However, there is no reason to assume that the solid phase S contents of oxidised hydrothermal sediments will reflect the original pyrite content, since a large proportion of the sulfate produced during oxidation may diffuse out of the sediment.…”

Section: Sitementioning

confidence: 95%

“…Edmonds and German (2004) found that the P/ Fe ratio in the Mid-Atlantic Rainbow hydrothermal plume was the same as in underlying short (up to 40 cm deep) cores, over a distance of 2-25 km from the source (Cave et al, 2002). By contrast, Schaller et al (2000) found that the P/Fe ratio in a 2.5 m core located 34 km from the southern East Pacific Rise (SEPR) at $10°S was approximately half that in SEPR plume particles from 13°S to 19°S . Thus the apparent preservational efficiency may vary, but the processes affecting the P/Fe ratio during diagenesis remain unclear.…”

Section: Introductionmentioning

confidence: 94%

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Co-diagenesis of iron and phosphorus in hydrothermal sediments from the southern East Pacific Rise: Implications for the evaluation of paleoseawater phosphate concentrations

Poulton

Canfield

2006

Geochimica et Cosmochimica Acta

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Section: Molar P/fe Ratiossupporting

confidence: 61%

Section: Sitementioning

confidence: 95%

Section: Introductionmentioning

confidence: 94%

See 1 more Smart Citation

Co-diagenesis of iron and phosphorus in hydrothermal sediments from the southern East Pacific Rise: Implications for the evaluation of paleoseawater phosphate concentrations

Poulton

Canfield

2006

Geochimica et Cosmochimica Acta

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“…Age offsets between core KLH093 at 1ºN and core Y71-09-104 range from 2-5 kyr (cells B78:C79 (9,16,35,41,42). Fe/Mn ratios for the cores discussed in this paper are shown in Figure S7.…”

Section: Supplementary Textmentioning

confidence: 98%

“…This appears to driven in part by the anomalously young radiocarbon age in core 104 at ~14 kyr BP which causes its oxygen isotope stratigraphy during the last deglaciation to lag other cores at 6ºS by 4-5 kyr (Figure 2). Age offsets between core KLH093 at 1ºN and core Y71-09-104 range from 2-5 kyr (cells B78:C79 9,16,35,41,42). Fe/Mn ratios for the cores discussed in this paper are shown in Figure S7.…”

mentioning

confidence: 98%

Enhanced East Pacific Rise hydrothermal activity during the last two glacial terminations

Lund

Asimow

Farley

et al. 2016

Science

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Tables S1 to S5 as Excel files 2 Materials and Methods Age modelsAge control for the EPR cores is provided by stable isotope and radiocarbon analyses of planktonic foraminifera (G. ruber, > 250 m size fraction). Ages for the long cores at 11ºS (Y71-07-47 and Y71-07-53) were determined by correlation of their planktonic 18 O stratigraphy to the global benthic 18 O stack of ref. 30 (Table S2). We followed a similar approach for KLH068 and KLH093 at 1ºN (12 (Table S1) and as a result these points were excluded from the age model. Metal concentrationsMetal analyses of samples for cores Y71-09-115 and Y71-07-47 were performed using a Bruker Pioneer S4 XRF at Michigan State University (MSU) (34). The relative standard deviation for major elements in external standards USGS BHVO-1 and RGM-1 is <0.3%. Analyses of Y71-09-104, Y71-09-106, Y71-07-49, and Y71-07-51 were performed using laser ablation and a Thermo-Fisher ICAP Q ICP-MS at MSU. Relative standard deviations and accuracy for major elements are ~3%. The calibration for As 4 was obtained using NIST 612 and GSD-1G, JB1a, and JA3 standards, with accuracy within ±5% of accepted values. The GSE-1G standard was run as an unknown for quality control; the mean of 4 measurements on 4 separate analytical sessions was within 5% of accepted value, with a relative standard deviation of <5%. Arsenic relative standard deviation among sample replicates was 2-10%, depending on absolute As concentrations. ICP-MS data for Y71-07-53 were reported in (16) and assigned ages based on the 18 O stratigraphy developed for this work.Fe and Mn concentrations were corrected for detrital inputs using Ti and the average Flux estimatesFluxes of hydrothermal components were estimated using both mass accumulation rates (MAR) and the 3 He normalization method. MAR's were determined using the drybulk density (DBD) of each sample, estimated using %CaCO3 (37), and the sedimentation rate. Because sedimentation rates are based on the assigned age model, MAR's are sensitive to age uncertainty. We assume an age error of ±20% between 5 successive metal analyses, larger than either the DBD uncertainty (±3%) or the error associated with the metal analyses (typically 5% or less). The age uncertainty is the primary contributor to the metal flux errors depicted in Figures 2 and 3. Prior to combining the short and long records at 11ºS into a continuous time series (Figure 4), we normalized each record by subtracting the mean flux and dividing by the standard deviation. This was necessary because the shorter records are closer to the ridge crest ( Figure 1) and as a result have higher mean metal concentrations and fluxes. For both the western and eastern flank records in Figure 4, the 0-40 kyr BP interval is based on data from the shorter gravity cores while the interval prior to 40 kyr BP is based on data from the longer piston cores.We also estimated sediment flux for two cores (Y71-07-49 and Y71-09-106) using the 3 He normalization method. The primary benefit of this approach is that: 1) it is insensitive t...

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Near‐vent chemical processes in a hydrothermal plume: Insights from an integrated study of the Endeavour segment

Coogan

Attar

Mihaly

et al. 2017

Geochem Geophys Geosyst

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The Endeavour segment of the Juan de Fuca mid-ocean ridge is one of the best studied ridge segments and has recently been instrumented as part of Ocean Networks Canada's NEPTUNE cabled observatory. Here we investigate the interaction between high-temperature vent fluids and the overlying water column. A new tow-yo survey found that the average temperature anomaly in the neutrally buoyant plume was 0.0438C. The water column temperature and light attenuation anomalies correlate linearly in some areas of the plume but in other areas there is a low light attenuation anomaly relative to the temperature anomaly. This temperature excess is interpreted to reflect heat input through (particle-poor) diffuse flow. If this is correct, about half of the heat flux along the Endeavour segment comes from diffuse flow. Sediment trap and push core data show that the mass accumulation rate of the hydrothermal component of the sediments decreases rapidly with distance from the major vent fields. Large changes in the composition of the hydrothermal component of the sediments also occur with distance from the vent fields. The composition of the sediments indicates (i) sulfides precipitate early and accumulate most rapidly close to the vents with a preferential order of element removal from the plume of Cd > Ag > Cu > Co Fe; (ii) barite is deposited somewhat further from the vents. Strontium and Pb appear to be strongly incorporated in barite and/or other sulfate minerals; (iii) at most a few percent of the mass of these ''insoluble'' elements that is vented gets deposited within 1.5 km of the vents.

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Oxyanions in metalliferous sediments: tracers for paleoseawater metal concentrations?

Cited by 35 publications

References 55 publications

Co-diagenesis of iron and phosphorus in hydrothermal sediments from the southern East Pacific Rise: Implications for the evaluation of paleoseawater phosphate concentrations

Co-diagenesis of iron and phosphorus in hydrothermal sediments from the southern East Pacific Rise: Implications for the evaluation of paleoseawater phosphate concentrations

Enhanced East Pacific Rise hydrothermal activity during the last two glacial terminations

Near‐vent chemical processes in a hydrothermal plume: Insights from an integrated study of the Endeavour segment

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