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Fracture dolomite as an archive of continental palaeo-environmental conditions

The origin of Quaternary dolomites in continental environments (e.g. karst and lakes) is barely constrained compared to marine dolomites in sedimentary records. Here we present a study of dolomite and aragonite formations infilling young fractures of the ‘Erzberg’ iron ore deposit, Austria, under co...

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Main Authors: Baldermann, Andre (Author) , Mittermayr, Florian (Author) , Bernasconi, Stefano M. (Author) , Dietzel, Martin (Author) , Grengg, Cyrill (Author) , Hippler, Dorothee (Author) , Kluge, Tobias (Author) , Leis, Albrecht (Author) , Lin, Ke (Author) , Wang, Xianfeng (Author) , Zünterl, Andrea (Author) , Boch, Ronny (Author)
Format: Article (Journal)
Language:English
Published: 21 October 2020
In: Communications earth & environment
Year: 2020, Volume: 1, Pages: 1-12
ISSN:2662-4435
DOI:10.1038/s43247-020-00040-3
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1038/s43247-020-00040-3
Verlag, kostenfrei, Volltext: https://www.nature.com/articles/s43247-020-00040-3
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Author Notes:Andre Baldermann, Florian Mittermayr, Stefano M. Bernasconi, Martin Dietzel, Cyrill Grengg, Dorothee Hippler, Tobias Kluge, Albrecht Leis, Ke Lin, Xianfeng Wang, Andrea Zünterl & Ronny Boch
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Summary:The origin of Quaternary dolomites in continental environments (e.g. karst and lakes) is barely constrained compared to marine dolomites in sedimentary records. Here we present a study of dolomite and aragonite formations infilling young fractures of the ‘Erzberg’ iron ore deposit, Austria, under continental-meteoric and low temperature conditions. Two dolomite generations formed shortly after the Last Glacial Maximum (~20 kyr BP): dolomite spheroids and matrix dolomite. Clumped isotope measurements and U/Th disequilibrium ages reveal formation temperatures of 0-3 °C (±6 °C) and 3-20 °C (±5 °C) for the both dolomite types, and depositional ages around 19.21 ± 0.10 kyr BP and 13.97 ± 0.08 kyr BP or younger, respectively. Meteoric solution and carbonate isotope compositions (δ18O, δ13C and 87Sr/86Sr) indicate the dolomites formed via aragonite and high-Mg calcite precursors from CO2-degassed, Mg-rich solutions. Our study introduces low temperature dolomite formations and their application as a sedimentary-chemical archive.
Item Description:Gesehen am 21.08.2024
Physical Description:Online Resource
ISSN:2662-4435
DOI:10.1038/s43247-020-00040-3

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