Negative Ce anomalies in Mn oxides: The role of Ce4+ mobility during water–mineral interaction

Loges, Anselm; Wagner, Thomas; Barth, Matthias; Bau, Michael; Göb, Susanne; Markl, Gregor

doi:10.1016/j.gca.2012.03.017

Cited by 87 publications

(39 citation statements)

References 101 publications

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“…Therefore, the Ce content in ocean water is unusually low (Bogdanov et al, 1995;Ren et al, 2011). Anomalously positive Ce is frequently found in Fe-Mn nodules and crusts of hydrogenous origin (Hein et al, 1997;Bau, 1999;Loges et al, 2012). When Fe-Mn crusts in the study area are compared with those of typical hydrothermal origins, such as from the Trans-Atlantic Geotraverse (TAG) hydrothermal field, it is apparent that the ferromanganese crusts of hydrothermal origin have extremely low ∑REE (2.793-27.632 ppm) (Mills et al, 2001) and negative Ce (Fig.8).…”

Section: Rare Earth Elementsmentioning

confidence: 99%

“…In addition to the three principal hypotheses of crust origin -diagenetic, hydrogenetic and hydrothermal (Halbach, 1986), a fourth one, biomineralization, has recently been added Han et al, 1997;Hu et al, 2000;Loges et al, 2012;Polgári et al, 2012;Lozano and Rossi, 2012). presented a hypothesis that coccoliths are crucial for the seed/nucleation phase of crust formation, thereby suggesting biologically induced biomineralization.…”

Section: Introductionmentioning

confidence: 99%

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Composition and origin of ferromanganese crusts from equatorial western Pacific seamounts

Wang

Jansa

Chu

et al. 2015

J. Ocean Univ. China

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In the equatorial western Pacific, iron-manganese oxyhydroxide crusts (Fe-Mn crusts) and nodules form on basaltic seamounts and on the top of drowned carbonate platform guyots that have been swept free of pelagic sediments. To date, the Fe-Mn crusts have been considered to be almost exclusively of abiotic origin. However, it has recently been suggested that these crusts may be a result of biomineralization. Although the Fe-Mn crust textures in the equatorial western Pacific are similar to those constructed by bacteria and algae, and biomarkers also document the existence of bacteria and algae dispersed within the Fe-Mn crusts, the precipitation, accumulation and distribution of elements, such as Fe, Mn, Ni and Co in Fe-Mn crusts are not controlled by microbial activity. Bacteria and algae are only physically incorporated into the crusts when dead plankton settle on the ocean floor and are trapped on the crust surface. Geochemical evidence suggests a hydrogenous origin of Fe-Mn crusts in the equatorial western Pacific, thus verifying a process for Fe-Mn crusts that involves the precipitation of colloidal phases from seawater followed by extensive scavenging of dissolved trace metals into the mineral phase during crust formation.

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Section: Rare Earth Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Composition and origin of ferromanganese crusts from equatorial western Pacific seamounts

Wang

Jansa

Chu

et al. 2015

J. Ocean Univ. China

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“…Negative Ce anomalies can develop in supergene ore bodies with increasing depth (Pracejus et al, 1990), although none of the ores analyzed in this study exhibit strongly negative Ce anomalies. Neutral or negative Ce anomalies have been explained by siderophore activity (Loges et al, 2012), but it must be noted that the Ce adsorption process is further complicated by the pH of the fluid system as well as the presence of humic acids and organic molecules Davranche et al, 2005;Pourret et al, 2008). Regardless of mechanism, it is clear that the majority of the Shenandoah Valley breccias have a different geochemical history than the rest of the ore bodies studied.…”

Section: Ree Patternsmentioning

confidence: 99%

New insight into the origin of manganese oxide ore deposits in the Appalachian Valley and Ridge of northeastern Tennessee and northern Virginia, USA

Carmichael

Doctor

Wilson

et al. 2017

Geological Society of America Bulletin

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Manganese oxide deposits have long been observed in association with carbonates within the Appalachian Mountains, but their origin has remained enigmatic for well over a century. Ore deposits of Mn oxides from several productive sites located in eastern Tennessee and northern Virginia display morphologies that include botryoidal and branching forms, massive nodules, breccia matrix cements, and fracture fills. The primary ore minerals include hollandite, cryptomelane, and romanèchite. Samples of Mn oxides from multiple localities in these regions were analyzed using electron microscopy, X-ray analysis, Fourier transform infrared spectroscopy, and trace/rare earth element geochemistry. The samples from eastern Tennessee have biological morphologies, contain residual biopolymers, and exhibit REE signatures that suggest the ore formation was due to supergene enrichment (likely coupled with microbial activity). In contrast, several northern Virginia ores hosted within quartz-sandstone breccias exhibit petrographic relations, mineral morphologies, and REE signatures indicating inorganic precipitation, and a likely hydrothermal origin with supergene overprinting. Nodular accumulations of Mn oxides within weathered alluvial deposits that occur near to breccia-hosted Mn deposits in Virginia show geochemical signatures that are distinct from the breccia matrices, and appear to reflect remobilization of earlier-emplaced Mn and concentration within supergene traps. Based on the proximity of all of the productive ore deposits to mapped faults or other zones of deformation, we suggest that the primary source of all of the Mn may have been deep-seated, and that Mn oxides with supergene and/or biological characteristics result from the local remobilization and concentration of this primary Mn. Carmichael ABSTRACTManganese oxide deposits have long been observed in association with carbonates within the Appalachian Mountains, but their origin has remained enigmatic for well over a century. Ore deposits of Mn oxides from several productive sites located in eastern Tennessee and northern Virginia display morphologies that include botryoidal and branching forms, massive nodules, breccia matrix cements, and fracture fills. The primary ore minerals include hollandite, cryptomelane, and romanèchite. Samples of Mn oxides from multiple localities in these regions were analyzed using electron microscopy, X-ray analysis, Fourier transform infrared spectroscopy, and trace/rare earth element geochemistry. The samples from eastern Tennessee have biological morphologies, contain residual biopolymers, and exhibit REE signatures that suggest the ore formation was due to supergene enrichment (likely coupled with microbial activity). In contrast, several northern Virginia ores hosted within quartz-sandstone breccias exhibit petrographic relations, mineral morphologies, and REE signatures indicating inorganic precipitation, and a likely hydrothermal origin with supergene overprinting. Nodular accumulations of Mn oxides within weathered al...

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“…Although there are some inconsistencies on the abbreviation of "REE" or "REY" in some geochemical literature [50], REY is adopted in this study to represent the lanthanides and Yttrium [51]. Owing to the unique geochemical behaviors, REY have been widely used as geochemical parameters to identify sediment source region and clarify the evolution processes of coal basins [51][52][53][54][55][56][57][58][59].…”

Section: Rare Earth Elements and Yttriummentioning

confidence: 99%

Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

et al. 2018

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Abstract:The mineralogical and geochemical compositions of the Lopingian coals from an exploratory drill core (ZK4-1) in the Zhongliangshan Coalfield, southwestern China are reported in this paper. The Zhongliangshan coals are medium volatile bituminous in rank (random vitrinite reflectance, average 1.38%), characterized by a medium-ash yield (26.84%) and high sulfur content (3.38%). Minerals in the Zhongliangshan coals are mainly composed of clay assemblages (kaolinite, the illite/smectite mixed layer (I/S) and chamosite), pyrite, quartz, carbonate minerals (calcite, marcasite, ankerite, and dolomite), and anatase, followed by rutile, jarosite, natrojarosite, bassanite, gypsum and K-feldspar, with traces of apatite, rhabdophane and barite. Compared with the average concentrations of the world hard coals, some trace elements including Li, V, Co, Cu, Se, Y, Zr, Nb, rare earth elements (REE), Cd, Ta, Hf and Hg, are enriched in the Zhongliangshan coals. The modes of occurrence of chamosite, barite, rhabdophane, quartz and calcite in the Zhongliangshan coals indicate that the coals have probably been affected by the injection of low-temperature hydrothermal fluids. Based on the concentrations of Sc, V, Cr, Co, Ni, Cu and Zn, the ratios of Al 2 O 3 /TiO 2 and the upper continental crust-normalized rare earth element and yttrium (REY) distribution patterns of the Zhongliangshan coals, the dominant sediment source regions are the Leshan-Longnvsi Uplift, Hannan Upland, and Dabashan Uplift, with a small proportion of terrigenous materials from the Kangdian Upland. The K7 and the upper portion of K1 coals have the potential as raw materials for the recovery of REY.

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Negative Ce anomalies in Mn oxides: The role of Ce4+ mobility during water–mineral interaction

Cited by 87 publications

References 101 publications

Composition and origin of ferromanganese crusts from equatorial western Pacific seamounts

Composition and origin of ferromanganese crusts from equatorial western Pacific seamounts

New insight into the origin of manganese oxide ore deposits in the Appalachian Valley and Ridge of northeastern Tennessee and northern Virginia, USA

Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

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