Data Publication

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

GFZ Data Services

(2022)

Descriptions

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).

Keywords

MSL enriched keywords

minerals

carbonate minerals

calcite

magnesite

Apparatus

deformation testing

compression testing

multi-anvil

measured property

barium

iron

lead (Pb)

lithium

manganese

niobium

sodium

strontium

MSL enriched sub domains i

rock and melt physics

geochemistry

Source

https://dataservices.gfz-potsdam.de/panmetaworks/showshort.php?id=8e1f95f2-2ad3-11ed-88a2-c7c587541054

Source publisher

GFZ Data Services

DOI

10.5880/gfz.3.6.2022.001

Creators

Sieber, Melanie J.

GFZ German Research Centre for Geosciences, Potsdam, Germany | University of Potsdam, Institute for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0001-6166-0094

Wilke, Franzsika D. H.