Major and trace element analysis of Ca-Mg-carbonates and carbonate melt at 6 and 9 GPa

Sieber, Melanie J.; Wilke, Franzsika D. H.; Appel, Oona; Oelze, Marcus; Koch-Müller, Monika;

2022 || GFZ Data Services

The melting relations of the CaCO3 MgCO3 system are investigated and trace element partition coefficient of Li, Na, K, Mn, Fe, Sr, Ba, Pb, Nb, Y and rare earth elements (REEs) between carbonates (Mg-calcite, Ca-magnesite) and dolomitic melt are established from high pressure (6 and 9 GPa) and temperature (1300 1800 ℃) experiments utilizing a rocking multi anvil press. We show that Ca Mg carbonates are stable within the subducting slab beyond ~300 km (9 GPa) but will (partial) melt beneath mid ocean ridges and in upwelling plumes. In contrast to previous studies, we report incongruent melting of carbonates producing a carbonate melt and periclase between 4 and 9 GPa. Partial melting of carbonates produces dolomitic melts whereby the trace element signature largely depends on the Ca/Mg-ratio of the bulk system. For instance, REE will be fractionated by two orders or magnitude between Ca magnesite and dolomitic melt. In contrast, melting of Ca rich carbonates will not lead to a significant REE fractionation.

The here published data set includes all chemical analysis (major and trace elment composition) of run products and starting materials. From this data set we obtained the melting relations and partition coefficients reported in Sieber et al. (2020); Sieber et al. (under review).

Originally assigned keywords

Corresponding MSL vocabulary keywords

MSL enriched keywords

MSL enriched sub domains
  • rock and melt physics
  • geochemistry
Source http://dx.doi.org/10.5880/gfz.3.6.2022.001
Source publisher GFZ Data Services
DOI 10.5880/gfz.3.6.2022.001
Authors
  • Sieber, Melanie J.
  • 0000-0001-6166-0094
  • GFZ German Research Centre for Geosciences, Potsdam, Germany; University of Potsdam, Institute for Geosciences, Potsdam, Germany;
  • Wilke, Franzsika D. H.
  • 0000-0002-3463-6176
  • GFZ German Research Centre for Geosciences, Potsdam, Germany;
  • Appel, Oona
  • GFZ German Research Centre for Geosciences, Potsdam, Germany;
  • Oelze, Marcus
  • 0000-0002-3950-6629
  • GFZ German Research Centre for Geosciences, Potsdam, Germany;
  • Koch-Müller, Monika
  • 0000-0001-6973-4967
  • GFZ German Research Centre for Geosciences, Potsdam, Germany;
Contributors
  • FAMILI Fluid And Melt Inclusion LA-ICP-MS Lab (GFZ German Research Centre for Geosciences, Germany)
  • HostingInstitution
  • GFZ German Research Centre for Geosciences, Potsdam, Germany;
  • Elemental Mapping by LA-ICP-MS (GFZ German Research Centre for Geosciences, Germany)
  • HostingInstitution
  • GFZ German Research Centre for Geosciences, Potsdam, Germany;
  • Microprobe Lab (GFZ German Research Centre for Geosciences, Germany)
  • HostingInstitution
  • GFZ German Research Centre for Geosciences, Potsdam, Germany;
  • Sieber, Melanie J.
  • ContactPerson
  • University of Potsdam, Institute for Geosciences, Potsdam, Germany;
References
  • Sieber, M. J., Wilke, F., & Koch-Müller, M. (2020). Partition coefficients of trace elements between carbonates and melt and suprasolidus phase relation of Ca-Mg-carbonates at 6 GPa. American Mineralogist, 105(6), 922–931. https://doi.org/10.2138/am-2020-7098
  • 10.2138/am-2020-7098
  • IsSupplementTo
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  • 10.1111/j.1751-908X.2011.00120.x
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  • 10.1039/C1JA10172B
  • Cites
  • Sieber, M. J., Wilke, F., & Koch-Müller, M. (2020). Partition coefficients of trace elements between carbonates and melt and suprasolidus phase relation of Ca-Mg-carbonates at 6 GPa. American Mineralogist, 105(6), 922–931. https://doi.org/10.2138/am-2020-7098
  • 10.2138/am-2020-7098
  • Cites
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  • 10.1111/j.1751-908X.2007.00104.x
  • Cites
Contact
  • Sieber, Melanie J.
  • University of Potsdam, Institute for Geosciences, Potsdam, Germany;
Citation Sieber, M. J., Wilke, F. D. H., Appel, O., Oelze, M., & Koch-Müller, M. (2022). Major and trace element analysis of Ca-Mg-carbonates and carbonate melt at 6 and 9 GPa (Version 1) [Data set]. GFZ Data Services. https://doi.org/10.5880/GFZ.3.6.2022.001