Origin and Paleoenvironmental Significance of Fe-Mn Nodules in the Holocene Perialpine Sediments of Geneva Basin, Western Switzerland

Branimir Segvic, Stéphanie Girardclos, Giovanni Zanoni, Carlos Arbiol Gonzalez, Tara Steimer-Herbet, Marie Besse

Research output: Contribution to journalArticlepeer-review

Abstract

Perialpine areas of central Europe have undergone significant changes following the last Alpine glaciation and especially through the Holocene time. This study relies on geochronological, mineralogical and geochemical clues to explain the formation and paleoenvironmental significance of Fe-Mn nodules reported from the young soils (~4.5 ka BC) of Geneva Basin in Western Switzerland. Having on average 2 mm in diameter, the nodules usually possess an onion-like and quasi-layered internal architecture defined by selective enrichments in Fe and Mn. Biotite is largely present in soil matrix and has served as a main source of Fe and Mn. Susceptible to favourable Eh-pH conditions several steps in biotite weathering were recognised leading to the formation of nodules – vermiculitization, microcracking, Fe-Mn segregation and re-precipitation. Mineral alterations were boosted by the long periods of warm climate during Boreal and Atlantic times as suggested by the gradually increasing illite-smec
Original languageEnglish
JournalApplied Clay Science
StatePublished - Feb 2018

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