Oxidative mobilization of cerium and uranium and enhanced release of “immobile” high field strength elements from igneous rocks in the presence of the biogenic siderophore desferrioxamine B

Kraemer, Dennis; Kopf, Sebastian; Bau, Michael

doi:10.1016/j.gca.2015.05.046

Cited by 73 publications

(62 citation statements)

References 88 publications

(92 reference statements)

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“…8) suggests that the accumulation of these elements in biological samples can occur through siderophore-like binding sites that usually prefer Hf and Fe to Zr (Yoshida et al, 2004). This hypothesis is consistent with limited Zr-Hf decoupling induced by bioaccumulation onto biological tissues (Kraemer et al, 2015).…”

Section: Discussionsupporting

confidence: 57%

Rare earths, zirconium and hafnium distribution in coastal areas: The example of Sabella spallanzanii (Gmelin, 1791)

Parisi

Cammarata

et al. 2017

Chemosphere

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Section: Discussionsupporting

confidence: 57%

Rare earths, zirconium and hafnium distribution in coastal areas: The example of Sabella spallanzanii (Gmelin, 1791)

Parisi

Cammarata

et al. 2017

Chemosphere

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“…We tentatively postulate that aside from redox processes, oxidative mobilization in the presence of biogenic siderophore desferrioxamine B (Kraemer et al. ) may have acted.…”

Section: Discussionmentioning

confidence: 84%

“…In addition, Kraemer et al. () demonstrated that mobilization caused by DFOB in mildly acidic and near‐neutral natural waters yield leaching solutions depleted in La and other light REE relative to the middle REE, and that always have positive Ce/Ce*.…”

Section: Discussionmentioning

confidence: 99%

“…Considering that oxidative mobilization caused by DFOB (Kraemer et al. ) may have played a certain role in alteration of the K‐Pg ejecta layer (S2) at Hole U1403B, PGE mobility may be connected to this process too.…”

Section: Discussionmentioning

confidence: 99%

“…An alternative or additional explanation is provided by Kraemer et al (2015). These authors show, based on experimental evidence, that leaching in presence of biogenic siderophore desferrioxamine B (DFOB) at low temperatures can mobilize, and hence, fractionate the HFSE (Y, Zr, Hf, Th, U, and REE).…”

Section: Discussionmentioning

confidence: 99%

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The Cretaceous/Paleogene (K‐Pg) boundary at the J Anomaly Ridge, Newfoundland (IODP Expedition 342, Hole U1403B)

Loroch

Deutsch

Berndt

et al. 2016

Meteorit & Planetary Scien

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We present results of an in‐situ geochemical study using laser‐ablation inductively coupled plasma–mass spectrometry (LA‐ICP‐MS) analyses along a ~4.3 cm long section across the K‐Pg event bed, drilled during IODP Expedition 342 at J Anomaly Ridge south of St. John's, Newfoundland. This section comprises the Maastrichtian with a sharp boundary to the graded, between 1.5 and 1.8 cm thick ejecta layer with totally altered impact glass spherules, which in turn is topped by Danian sediments. The porous and clayey material required elaborate preparation in order to yield reliable data. The ejecta bed shows a highly variable depletion in rare earth elements that even results in strongly subchondritic concentrations. The Ce/Ce* varies strongly (0.81–34), Ni/Cr ranges from 0.38 to 2.79. The maximum platinum group elements (PGE) concentrations are located in one LA‐spot exactly at the basis of the ejecta layer; they amount (in μg g−1) to 0.35 (Rh), 1.64 (Pd), 2.79 (Pt), and 0.86 (Au). The Nb/Ta ratio increases in the Ma from ~10 to 35.9 toward the ejecta horizon, which itself has higher Nb, Ta, Zr, and Hf concentrations than the background sedimentation, combined with low Nb/Ta (~5–10), and low Zr/Hf (~20–30). The overall result is that alteration processes changed totally the original geochemical characteristics of this K‐Pg spherule bed. To explain the exorbitant element mobility at distances of hundreds of μm, we discuss a combination of mostly reducing redox processes and interaction with organic compounds. This study demonstrates the high potential of in‐situ analyses with high spatial resolution at complex geological materials. Moreover, our results indicate that some caution is necessary in determining the projectile type in impactites via PGE ratios.

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Oxidized Ores as Future Resource for Platinum Group Metals: Current State of Research

Kraemer

Junge

Bau

2016

Chemie Ingenieur Technik

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The platinum group elements (PGE), which are used in many high technology applications, are classified as critical metals by the EU. Therefore, research has to focus on potential alternative resources. Oxidized ores are found in the weathered zones of common sulfidic deposits, such as the Bushveld and the Great Dyke, and could be considered as potential future resources. The grades and reserves are high. However, due to geochemical and mineralogical changes induced by weathering, extraction of PGE is still limited and uneconomic. The current state of research on oxidized PGE ores in geosciences and processing is summarized.

show abstract

Oxidative mobilization of cerium and uranium and enhanced release of “immobile” high field strength elements from igneous rocks in the presence of the biogenic siderophore desferrioxamine B

Cited by 73 publications

References 88 publications

Rare earths, zirconium and hafnium distribution in coastal areas: The example of Sabella spallanzanii (Gmelin, 1791)

Rare earths, zirconium and hafnium distribution in coastal areas: The example of Sabella spallanzanii (Gmelin, 1791)

The Cretaceous/Paleogene (K‐Pg) boundary at the J Anomaly Ridge, Newfoundland (IODP Expedition 342, Hole U1403B)

Oxidized Ores as Future Resource for Platinum Group Metals: Current State of Research

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