Fracture dolomite as an archive of continental palaeo-environmental conditions
| Autor: | Stefano M. Bernasconi, Andre Baldermann, Andrea Zünterl, Martin Dietzel, Ronny Boch, Tobias Kluge, Cyrill Grengg, Xianfeng Wang, Dorothee Hippler, Ke Lin, Florian Mittermayr, Albrecht Leis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Geography & travel Dolomite Geochemistry engineering.material 010502 geochemistry & geophysics Palaeoclimate 01 natural sciences Matrix (geology) Sedimentary depositional environment chemistry.chemical_compound GE1-350 Sedimentology ddc:910 0105 earth and related environmental sciences General Environmental Science Calcite geography QE1-996.5 geography.geographical_feature_category Aragonite Geology FOS: Earth and related environmental sciences Karst Environmental sciences chemistry engineering General Earth and Planetary Sciences Carbonate Sedimentary rock |
| Zdroj: | Communications Earth & Environment, 1 (1) Communications Earth & Environment, Vol 1, Iss 1, Pp 1-12 (2020) Communications earth & environment, 1 (1), 35 |
| ISSN: | 2662-4435 |
| DOI: | 10.5445/ir/1000126175 |
| Popis: | 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. Communications Earth & Environment, 1 (1) ISSN:2662-4435 |
| Databáze: | OpenAIRE |
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