Comparison of reductive accumulation of Re and Os in seawater–sediment systems

Yamashita, Yoshiro; Takahashi, Yoshio; Haba, Hiromitsu; Enomoto, Shuichi; Shimizu, Hiroshi

doi:10.1016/j.gca.2007.05.003

Cited by 97 publications

(62 citation statements)

References 49 publications

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“…A few studies have successfully combined both the field-and experimental-based 159 approaches to generate mechanistic interpretations of RSM distributions in sediments and 160 pore waters (Cochran et al, 1986;Barnes and Cochran, 1993;Helz et al, 1996; 161 Yamashita et al, 2007). The research presented here also represents a bridge between 162 these two research approaches.…”

Section: Bostick Et Al (2003) Further Showed That Molybdate Adsorbs mentioning

confidence: 99%

A model for uranium, rhenium, and molybdenum diagenesis in marine sediments based on results from coastal locations

Morford

Martin

François

et al. 2009

Geochimica et Cosmochimica Acta

130

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30 31The purpose of this research is to characterize the mobilization and 32 immobilization processes that control the authigenic accumulation of uranium (U), 33 rhenium (Re) and molybdenum (Mo) in marine sediments. We analyzed these redox-34 sensitive metals (RSM) in benthic chamber, pore water and solid phase samples at a site 35 in Buzzards Bay, Massachusetts, U.S.A., which has high bottom water oxygen 36 concentrations (230-300 mol/L) and high organic matter oxidation rates (390 mol 37 C/cm 2 /y). The oxygen penetration depth varies from 2-9 mm below the sediment-water 38 interface, but pore water sulfide is below detection (< 2 M). The RSM pore water 39 profiles are modeled with a steady-state diagenetic model that includes irrigation, which 40 extends 10-20 cm below the sediment-water interface. To present a consistent 41 description of trace metal diagenesis in marine sediments, RSM results from sediments in 42Buzzards Bay are compared with previous research from sulfidic sediments (Morford et 43 al., GCA 71). 44Release of RSM to pore waters during the remineralization of solid phases occurs 45 near the sediment-water interface at depths above the zone of authigenic RSM formation. 46This release occurs consistently for Mo at both sites, but only in the winter for Re in 47Buzzards Bay and intermittently for U. At the Buzzards Bay site, Re removal to the solid 48 phase extends to the bottom of the profile, while the zone of removal is restricted to ~2-9 49 cm for U and Mo. Authigenic Re formation is independent of the anoxic 50 remineralization rate, which is consistent with an abiotic removal mechanism. The rate 51 of authigenic U formation and its modeled removal rate constant increase with increasing 52 anoxic remineralization rates, and is consistent with U reduction being microbially 53

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Section: Bostick Et Al (2003) Further Showed That Molybdate Adsorbs mentioning

confidence: 99%

A model for uranium, rhenium, and molybdenum diagenesis in marine sediments based on results from coastal locations

Morford

Martin

François

et al. 2009

Geochimica et Cosmochimica Acta

130

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“…The Betsie samples all display very low OI values, indicating there was very low oxygen content within the kerogen. Under highly reducing conditions, Re may be more readily incorporated into organic-rich material (Yamashita et al, 2007). The shale parting near the Matewan-Betsie contact is marked by high sulfur content (28 wt.%) and Re is enriched relative to Os in the presence of highly sulfidic waters (Helz and Dolor, 2012;Tripathy et al, 2014).…”

Section: Re-os Fractionation In the Betsie Shale Membermentioning

confidence: 99%

Re–Os age for the Lower–Middle Pennsylvanian Boundary and comparison with associated palynoflora

Geboy

Tripathy

Ruppert

et al. 2015

International Journal of Coal Geology

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The Betsie Shale Member is a relatively thick and continuous unit that serves as a marker bed across the central Appalachian basin, in part because it includes an organic-rich shale unit at its base that is observable in drill logs. Deposited during a marine transgression, the Betsie Shale Member has been correlated to units in both Wales and Germany and has been proposed to mark the boundary between the Lower and Middle Pennsylvanian Series within North America. This investigation assigns a new Re-Os date to the base of the Betsie and examines the palynoflora and maceral composition of the underlying Matewan coal bed in the context of that date. The Matewan coal bed contains abundant lycopsid tree spores along its base with assemblage diversity and inertinite content increasing upsection, as sulfur content and ash yield decrease. Taken together, these palynologic and organic petrographic results suggest a submerged paleomire that transitioned to an exposed peat surface. Notably, separating the lower and upper benches of the Matewan is a parting with very high sulfur content (28 wt.%), perhaps representing an early marine pulse prior to the full on transgression responsible for depositing the Betsie. Results from Re-Os geochronology date the base of the Betsie at 323 ± 7.8 Ma, consistent with previously determined age constraints as well as the palynoflora assemblage presented herein. The Betsie Shale Member is also highly enriched in Re (ranging from 319.7 to 1213 ng/g), with high 187 Re/ 188 Os values ranging from 3644 to 5737 likely resultant from varying redox conditions between the pore water and overlying water column during deposition and early condensing of the section.Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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“…Variations in the concentration of carbonates, the major component in these samples, are small enough to explain the change in Os concentration and Os/Ir across this interval. It is well known that Os concentrations are elevated in organic rich sediments presumably via scavenging by organic matter and/or reductive accumulation of Os Cohen et al, 1999;Singh et al, 1999;Yamashita et al, 2007). Ir scavenging by organic matter seems to be comparatively less efficient as evident from Ir concentration in organic rich sediments (Colodner et al, 1992;Ravizza and Pyle, 1997), its negative correlation with organic carbon both in marine and non-marine organic sediments (Bajoumy and Peucker-Ehrenbrink, 2008) and from results of experimental studies of Ir adsorption (Dai et al, 2000).…”

Section: Response Of Osmium Burial To Paleoceonographic Processesmentioning

confidence: 99%

Investigation of an early Pleistocene marine osmium isotope record from the eastern equatorial Pacific

Dalai¹,

Ravizza²

2010

Geochimica et Cosmochimica Acta

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Comparison of reductive accumulation of Re and Os in seawater–sediment systems

Cited by 97 publications

References 49 publications

A model for uranium, rhenium, and molybdenum diagenesis in marine sediments based on results from coastal locations

A model for uranium, rhenium, and molybdenum diagenesis in marine sediments based on results from coastal locations

Re–Os age for the Lower–Middle Pennsylvanian Boundary and comparison with associated palynoflora

Investigation of an early Pleistocene marine osmium isotope record from the eastern equatorial Pacific

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