Elemental mobility in phosphatic shales during concretion growth and implications for provenance analysis

Kidder, David L.; Krishnaswamy, Rama; Mapes, Royal H.

doi:10.1016/s0009-2541(03)00036-6

Cited by 134 publications

(50 citation statements)

References 32 publications

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“…Nonetheless, it should be noted that Kidder et al (2003) report positive Eu anomalies for the rims of phosphatic concretions recovered from black shales, which they interpreted to have formed under intense reducing conditions. Thus, an apatite weathering origin for some of the reported Eu anomalies of the stream sediments probably cannot be entirely dismissed.…”

Section: Europium Anomaliesmentioning

confidence: 95%

Rare earth elements (REE) and yttrium in stream waters, stream sediments, and Fe–Mn oxyhydroxides: Fractionation, speciation, and controls over REE+Y patterns in the surface environment

Leybourne

Johannesson

2008

Geochimica et Cosmochimica Acta

261

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Section: Europium Anomaliesmentioning

confidence: 95%

Rare earth elements (REE) and yttrium in stream waters, stream sediments, and Fe–Mn oxyhydroxides: Fractionation, speciation, and controls over REE+Y patterns in the surface environment

Leybourne

Johannesson

2008

Geochimica et Cosmochimica Acta

261

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“…The Eu/Eu* values are generally lower than 1, except for a few data greater than 1 in Guanyinqiao Formation, indicating negative anomalies in most cases. Those Eu/Eu* values greater than 1 may have been resulted from hydrothermal activity or extremely reducing conditions [42,43] . Given the seabed was oxygenated during the Guanyinqiao period, as discussed above, positive Eu anomaly may be interpreted as a result of highly reducing hydrothermal fluids.…”

Section: Rare Earth Element (Ree) Systematicsmentioning

confidence: 99%

Geochemical changes across the Ordovician-Silurian transition on the Yangtze Platform, South China

Yan

Chen

Wang

et al. 2009

Sci. China Ser. D-Earth Sci.

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The trace element and rare earth element (REE) variations across the Ordovician-Silurian succession are presented from two outcrop sections on the Yangtze Platform: the Nanbazi section, Guizhou Province, deposited in a shallow platform interior setting, and the Wangjiawan section, Hubei Province, deposited in a deeper basinal environment. Geochemical analysis of closely spaced samples through three intervals, the Wufeng, Guanyinqiao and Longmaxi, revealed vast palaeoceanographic changes. Some geochemical proxies, including Th/U, Ni/Co, V/Cr, and V/(V+Ni) ratios, together with sedimentary facies and biotic data, indicate that an anoxic condition on the most of the Yangtze Platform during the Wufeng and Longmaxi intervals, but an oxic condition during the Guanyinqiao time. The shift of the anoxic to the oxic environment during the Guanyinqiao time coincided with a global sea-level lowstand, in parallel with the global glaciation. The Longmaxian anoxic environment was a result of a global sea-level rise, which may be synchronized with a mainly catastrophic event in the latest Ordovician.Although the two sections generally show similar variation patterns of trace and REE concentrations and some element ratios, a minor difference occurs between the Wangjiawan and Nanbazi sections, likely reflecting a difference in depositional setting during the accumulation. Such an oceanic oxygen-level variation may add a useful constraint to the current arguments on the cause and consequence of the latest Ordovician mass extinction. rare earth elements, trace elements, paleo-redox proxies, mass extinction, Ordovician-Silurian boundary, Yangtze Platform

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“…Although the contents of accessory P-bearing minerals are very low, they may account for most of the REE in rocks Harlavan and Erel, 2002). Moreover, the middle REEs are found to be distinctly enriched in the P-bearing minerals (e.g., phosphate) in shales (e. g., Kidder et al, 2003), and weathering of phosphate minerals can cause the enrichment of middle REEs in freshwaters (Hannigan and Sholkovitz, 2001). Thus, the leaching of middle REEs (Nd-Dy) after initial weathering (Fig.…”

mentioning

confidence: 99%

Geochemistry of major and trace elements and Pb–Sr isotopes of a weathering profile developed on the Lower Cambrian black shales in central Hunan, China

Peng

Rate

Song

et al. 2014

Applied Geochemistry

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Elemental mobility in phosphatic shales during concretion growth and implications for provenance analysis

Cited by 134 publications

References 32 publications

Rare earth elements (REE) and yttrium in stream waters, stream sediments, and Fe–Mn oxyhydroxides: Fractionation, speciation, and controls over REE+Y patterns in the surface environment

Rare earth elements (REE) and yttrium in stream waters, stream sediments, and Fe–Mn oxyhydroxides: Fractionation, speciation, and controls over REE+Y patterns in the surface environment

Geochemical changes across the Ordovician-Silurian transition on the Yangtze Platform, South China

Geochemistry of major and trace elements and Pb–Sr isotopes of a weathering profile developed on the Lower Cambrian black shales in central Hunan, China

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