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: | , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
21 October 2020
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| 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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| 520 | |a 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. | ||
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