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Petrographic and mineralogical characteristics of diagenetic overprinting in Neoproterozoic diamictites from Murchisonfjorden, Nordaustlandet, Svalbard Cover

Petrographic and mineralogical characteristics of diagenetic overprinting in Neoproterozoic diamictites from Murchisonfjorden, Nordaustlandet, Svalbard

Open Access
|Mar 2025

Abstract

The diagenetic processes exhibited by the Neoproterozoic diamictites from Murchisonfjorden (Nordaustlandet, NE Svalbard) are presented. Diamictite samples from the Cryogene Polarisbreen Group - the Petrovbreen Member of the Elbobreen Formation and the Wilsonbreen Formation were analysed. The mineralogical associations composed of chlorite group minerals (chamosite), albite, calcite, Fe-dolomite, clay minerals (illite) and quartz, recognized by integrated optical microscopy, scanning electron microscopy (SEM) and Raman spectroscopy techniques are typical for an advanced stage of mesogenetic diagenesis. Low-grade burial mineral associations were not identified. Our investigations indicate that during diagenesis increased heat flux accompanied fluid migration and remineralization. Identified Fe-Ti – oxides, anatase in thin sections and magnetite identified by rock-magnetic experiments are the products of the secondary diagenetic mineralization. The ferromagnetic carriers representing primary depositional remanence magnetization (DRM) were not preserved.

DOI: https://doi.org/10.2478/mipo-2025-0004 | Journal eISSN: 1899-8526 | Journal ISSN: 1899-8291
Language: English
Page range: 23 - 33
Submitted on: Nov 26, 2024
Accepted on: Feb 15, 2025
Published on: Mar 28, 2025
Published by: Mineralogical Society of Poland
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2025 Szczepan Bal, Krzysztof Nejbert, Krzysztof Michalski, Justyna Domańska-Siuda, Geoffrey Manby, Aleksandra Hołda-Michalska, Jiři Sláma, published by Mineralogical Society of Poland
This work is licensed under the Creative Commons Attribution 4.0 License.