Discrimination between effects induced by microbial activityand water-rock interactions under hydrothermal conditionsaccording to REE behaviour

Risultato della ricerca: Articlepeer review

Abstract

Rare earth elements (REE) were investigated in siliceous stromatolites forming in the Specchio di Venere Lake on Pantelleria Island. Chondrite-normalised patterns show significant La enrichments and Eu depletions suggesting that fluids involved in stromatolite growth experienced strong rock-water interactions under hydrothermal conditions. At the same time, enrichments in heavy REE (HREE) with respect to intermediate REE (MREE) suggest that hydrothermal fluids interacted with microbial mats during deposition of the stromatolites. The above-mentioned features suggest that rock-water interactions and bacterial activity were simultaneously recorded in the REE patterns of stromatolites, and can be discriminated in terms of amplitudes of the La anomaly, and the HREE/MREE ratio.
Lingua originaleEnglish
pagine (da-a)123-126
Numero di pagine4
RivistaProcedia Earth and Planetary Science
Volume7
Stato di pubblicazionePublished - 2013

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