 | Rea, Maria Angelica D., Wulser, Pierre-Alain, Brugger, Joël, Etschmann, Barbara, Bissett, Andrew, Shuster, Jeremiah, Reith, Frank (2019) Effect of physical and biogeochemical factors on placer gold transformation in mountainous landscapes of Switzerland. Gondwana Research, 66. 77-92 doi:10.1016/j.gr.2018.10.006 | Journal (article/letter/editorial) | | recent studies have shown that highly reactive manganese oxides, especially the ubiquitous biomineral birnessite...from eight sites in Switzerland AC and nearby Italy with highly diverse contemporary landscape settings...Switzerland and one site just across the border in Italy. These sites were chosen AC because they provide...Gondo belongs to the Monte Rosa metallogenic gold province, which is well developed in the Italian Piemont...adjacent high-energy Alpine stream (Fig. 2B). At AC Iselle (IS), a high-energy Alpine river bed provides gold |  | | Journal (issue) | | and Alban Thomas near Raddusa, Catania, Sicily, Italy...................................................Specimen gold is found within clay or iron and manganese oxidefilled pockets that formed in “floor” quartz... Bryan Lees photo. goethite, ilmenite, or manganese oxides from phosphate minerals; encrustations by...connecting Brig, Switzerland with Domodossola, Italy. Cutting through the Alps beneath the Simplon Pass...railway between the Romandy region of Switzerland and Italy, 479 Figure 1. Topographic map showing the path |  | | Journal (article/letter/editorial) | | Cr(VI) accumulation rate. 3.4. Extracellular Fe-oxides accumulate Cr 3.3. Steady-state cellular Cr concentrations...Cr. Thus, when [Fe´] is high, extracellular Fe-oxides can scavenge Cr out of solution; and this scavenging...material, but not adsorption to extracellular Fe-oxides. We are unable to rule out either possibility....back to the less particle reactive Cr(VI) by Mn-oxides (Eary and Rai, 1987; Tang et al., 2014), or undergoes...III III VI (g) III III We would like to thank Iselle Flores and Sachiko Ouchi for their assistance in |
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Iselle Quarry, Trasquera, Verbano-Cusio-Ossola Province, Piedmont, Italy