Mobility of rhenium, platinum group elements and organic carbon during black shale weathering

Jaffe, L. A.; Peucker‐Ehrenbrink, Bernhard; Petsch, S.

doi:10.1016/s0012-821x(02)00526-5

Cited by 167 publications

(135 citation statements)

References 42 publications

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“…This is also consistent with a recent study on the weathering behavior of CK carbonaceous chondrites where even severely weathered Antarctic samples showed no resolvable anomaly in their Os abundance compared to other CK finds and falls. Re was not measured in the latter study; it is, however, expected to be more mobile during terrestrial weathering than other platinum group elements (Jaffe et al, 2002). The main Re and Os-bearing phase in ureilites is kamacite that is associated with carbonaceous material (Janssens et al, 1987;Wänke et al, 1972;Wlotzka, 1972 (Goodrich et al, 2002;Kita et al, 2003;Torigoye-Kita et al, 1995c) and closed-system Re/Os evolution.…”

Section: Effects Of Terrestrial Weathering On Ureilite Re and Os Abunmentioning

confidence: 89%

Osmium isotope systematics of ureilites

Rankenburg

Brandon

Humayun

2007

Geochimica et Cosmochimica Acta

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The 187 Os/ 188 Os for twenty-two ureilite whole rock samples, including monomict, augite-bearing, and polymict lithologies, were examined in order to constrain the provenance and subsequent magmatic processing of the ureilite parent body (or bodies). The Re/Os ratios of most ureilites show evidence for a recent disturbance, probably related to Re mobility during weathering, and no meaningful chronological information can be extracted from the present data set. The ureilite 187 Os/ 188 Os ratios span a range from 0.11739 to 0.13018, with an average of 0.1258 ± 0.0023 (1σ), similar to typical carbonaceous chondrites, and distinct from ordinary or enstatite chondrites. The similar mean of 187 Os/ 188 Os measured for the ureilites and carbonaceous chondrites suggests that the ureilite parent body probably formed within the same region of the solar nebula as carbonaceous chondrites. From the narrow range of the 187 Os/ 188 Os distribution in ureilite meteorites it is further concluded that Re was not significantly fractionated from Os during planetary differentiation and was not lost along with the missing ureilitic melt component. The lack of large Re/Os fractionations requires that Re/Os partitioning was controlled by a metal phase, and thus metal had to be stable throughout the interval of magmatic processing on the ureilite parent body.3

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Section: Effects Of Terrestrial Weathering On Ureilite Re and Os Abunmentioning

confidence: 89%

Osmium isotope systematics of ureilites

Rankenburg

Brandon

Humayun

2007

Geochimica et Cosmochimica Acta

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“…Weathering has the potential to disturb the Re-Os system in organic-rich rocks (e.g., Jaffe et al, 2002). These samples (and those from the other studies described above) were collected from underground mines at depths of between 500-1000m but the likelihood of such secondary effects remains unclear.…”

Section: Discussionmentioning

confidence: 99%

A multistage origin for Kupferschiefer mineralization

Alderton

Selby

Kucha

et al. 2016

Ore Geology Reviews

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Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. 'event' for introducing additional metals is as yet unknown.

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“…Under subsurface conditions organic carbon in sedimentary rocks is recalcitrant to degradation, but exposure of this organic material to oxygenated surfaces can result in OM loss and release of CO 2 . It is estimated that weathering of black shales causes 12% of annual CO 2 flux from oxidative weathering of sedimentary rocks (Jaffe et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Variable effects of labile carbon on the carbon use of different microbial groups in black slate degradation

Seifert¹,

Trumbore²,

Xu³

et al. 2011

Geochimica et Cosmochimica Acta

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Weathering of ancient organic matter contributes significantly to biogeochemical carbon cycles over geological times. The principle role of microorganisms in this process is well recognized. However, information is lacking on the contribution of individual groups of microorganisms and on the effect of labile carbon sources to the degradation process. Therefore, we investigated the contribution of fungi, Gram-positive and Gram-negative bacteria in the degradation process using a column experiment. Investigations were performed on low metamorphic black slates. All columns contained freshly crushed, sieved (0.63-2 mm), not autoclaved black slates. Two columns were inoculated with the lignite-degrading fungus Schizophyllum commune and received a culture medium containing 13 C labeled glucose, two columns received only this culture medium and two control columns received only water.The total mass balance was calculated from all carbon added to the slate and the CO 2 and DOC losses. Phospholipid fatty acids (PLFA) were extracted to investigate microbial communities. We used both the compound specific 14 C and 13 C signal of the PLFA to quantify carbon uptake from black slates and the glucose of the culture medium, respectively.The total carbon loss in these columns exceeded the amount of added carbon by approximately 60%, indicating that black slate carbon has been used. PLFA associated with Gram-positive bacteria dominated the indigenous community and took up 22% of carbon from black slate carbon, whereas PLFA of Gram-negative bacteria used only 8% of carbon from the slates. PLFA of Gram-negative bacteria and fungi were both mostly activated by the glucose addition. The added Schizophyllum did not establish well in the columns and was overgrown by the indigenous microbial community. Our results suggest that especially Gram-positive bacteria are able to live on and degrade black slate material. They also benefit from easy degradable carbon from the nutrient broth. In natural environments priming due to root exudates might consequently enhance weathering.

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Mobility of rhenium, platinum group elements and organic carbon during black shale weathering

Cited by 167 publications

References 42 publications

Osmium isotope systematics of ureilites

Osmium isotope systematics of ureilites

A multistage origin for Kupferschiefer mineralization

Variable effects of labile carbon on the carbon use of different microbial groups in black slate degradation

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