Microscale Si isotope variations in radiolarian cherts from the Rhenish Massif
The Rhenohercynian back-arc basin hosts a Lower Carboniferous chert-shale succession that documents variable radiolarian productivity, subareal volcanism and pelagic background sedimentation. To assess the potential of radiolarian cherts to record paleo-productivity and/or oceanic Si concentrations, we investigate silicon isotope ratios (δ30Si) of radiolarian shells, their secondary fills and the matrix in which they are embedded by fs-Laser ablation-MC-ICP-MS. We discuss causes of variations in δ30Si among the analyzed compartments that either point to isotope fractionation during early silicification of the sediments or the presence of two silica sources.
Details
Author
Michael Tatzel1, Daniel A Frick2Institutionen
1Universität Göttingen, Germany; 2Geoforschungszentrum Potsdam, GermanyVeranstaltung
GeoMinKöln 2022Datum
2022DOI
10.48380/kten-vm72Geolocation
Germany
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