Precipitation of dolomite from seawater on a Carnian coastal plain (Dolomites, northern Italy): evidence from carbonate petrography and Sr isotopes

Rieder, Maximilian; Wegner, Wencke; Horschinegg, Monika; Klackl, Stefanie; Preto, Nereo; Breda, Anna; Gier, Susanne; Klötzli, Urs; Bernasconi, Stefano M.; Arp, Gernot; Meister, Patrick

doi:https://doi.org/10.5194/se-10-1243-2019

Articles | Volume 10, issue 4

https://doi.org/10.5194/se-10-1243-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/se-10-1243-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 10, issue 4

Research article

|

31 Jul 2019

Research article |

| 31 Jul 2019

Precipitation of dolomite from seawater on a Carnian coastal plain (Dolomites, northern Italy): evidence from carbonate petrography and Sr isotopes

Maximilian Rieder, Wencke Wegner, Monika Horschinegg, Stefanie Klackl, Nereo Preto, Anna Breda, Susanne Gier, Urs Klötzli, Stefano M. Bernasconi, Gernot Arp, and Patrick Meister

Supplement

https://doi.org/10.5194/se-10-1243-2019-supplement

Data sets

Strontium, carbon, and oxygen isotopes in Triassic dolomites - Travenanzes Formation (Italy) M. Rieder, W. Wegner, M. Horschinegg, S. Klackl, N. Preto, A. Breda, S. Gier, U. Klötzli, S. M. Bernasconi, G. Arp, and P. Meister https://doi.org/10.1594/PANGAEA.902276

Short summary

The formation of dolomite (CaMg(CO₃)₂), an abundant mineral in Earth's geological record, is still incompletely understood. We studied dolomites embedded in a 100 m thick succession of coastal alluvial clays of Triassic age in the southern Alps. Observation by light microscopy and Sr isotopes suggests that dolomites may spontaneously from concentrated evaporating seawater, in coastal ephemeral lakes or tidal flats along the western margin of the Triassic Tethys sea.