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Effects of syn- and post-depositional processes on the rare-earth element distribution in Precambrian iron-formations

Michael Bau
Effects of syn- and post-depositional processes on the rare-earth element distribution in Precambrian iron-formations
European Journal of Mineralogy (April 1993) 5 (2): 257-267

Abstract

The REE distribution in these rocks may be affected by syn- depositional (clastic contamination, precipitation) and post- depositional (diagenesis, metamorphism, hydrothermal alteration, weathering) processes. Pyro- and/or epiclastic contamination of the chemically precipitated component was found to be important and to decrease (Eu/Sm) (sub CN) and increase (Sm/Yb) (sub CN) ratios. Samples with high abundances of immobile trace elements (e.g. Sc > 2 ppm) should be excluded from a sample set. Due to closed-system conditions for the REE and low water/rock ratios, the REE distribution in iron formations is usually not affected by diagenesis or contact metamorphism but hydrothermal alteration and weathering may have a significant impact. Such samples should be excluded from a population of iron-formation samples chosen for studies requiring the interpretation of primary REE distributions.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 2
Title: Effects of syn- and post-depositional processes on the rare-earth element distribution in Precambrian iron-formations
Author(s): Bau, Michael
Affiliation: Hahn-Meitner-Institut Berlin, AG Geochemie, Berlin, Federal Republic of Germany
Pages: 257-267
Published: 199304
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 67
Accession Number: 1993-010396
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
S24°00'00" - S20°00'00", E116°00'00" - E122°00'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1993
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