Effect of variable carbonate concentration on the solidus of mantle peridotite

@article{Dasgupta2007EffectOV,
  title={Effect of variable carbonate concentration on the solidus of mantle peridotite},
  author={Rajdeep Dasgupta and Marc M. Hirschmann},
  journal={American Mineralogist},
  year={2007},
  volume={92},
  pages={370 - 379}
}
Abstract To explore the effect of variable CO2 concentrations on the solidus of natural carbonated peridotite, we determined near-solidus phase relations of three different nominally anhydrous, carbonated lherzolite bulk compositions at 6.6 GPa. Starting mixes (PERC, PERC2, and PERC3) were prepared by adding variable proportions of a carbonate mixture that has the same Ca:Mg:Fe:Na:K ratio as the base silicate peridotite [MixKLB-1: Mg no. = 89.7; Ca no. = molar Ca/(Ca + Mg + Fe*) = 0.05]. For… 

Figures and Tables from this paper

Links between Carbonatite and Kimberlite Melts in Chloride–Carbonate–Silicate Systems: Experiments and Application to Natural Assemblages
Recent data suggest an active role for chloride-bearing alkali carbonatitic melts in the formation and evolution of kimberlites, whereas experiments indicate that chlorides could be responsible for
A model for the activity of silica along the carbonatite–kimberlite–mellilitite–basanite melt compositional joint
Carbon dioxide and water, being present in the Earth’s mantle at concentration levels of tens to hundreds of ppm, greatly lower the peridotite solidus temperature and drastically modify the
Solidus and phase relations of carbonated peridotite in the system CaO–Al2O3–MgO–SiO2–Na2O–CO2 to the lower mantle depths
Abstract Melting phase relations have been determined in a model carbonated peridotite (5 wt.% CO 2 ) at 10.5–32.0 GPa and 1300–1850 °C. The assemblage of silicate minerals coexisting with partial
Partial Melting Experiments of Peridotite + CO2 at 3 GPa and Genesis of Alkalic Ocean Island Basalts
We document compositions of minerals and melts from 3 GPa partial melting experiments on two carbonate-bearing natural lherzolite bulk compositions (PERC: MixKLB-1þ2 5 wt% CO2; PERC3: MixKLB-1þ1wt%
The system Na2CO3–CaCO3 at 3 GPa
It was suggested that alkali–alkaline earth carbonates may have a substantial role in petrological processes relevant to metasomatism and melting of the Earth’s mantle. Because natrite, Na2CO3, Na–Ca
The Melting of Carbonated Pelites from 70 to 700 km Depth
Phase assemblages, melting relations and melt compositions of a dry carbonated pelite (DG2) and a carbonated pelite with 1·1wt % H2O (AM) have been experimentally investigated at 5·5^ 23·5 GPa and
Anomalous structure of MgCO 3 liquid and the buoyancy of carbonatite melts 1
16 MgCO3 is one of the most important components of mantle-derived carbonatite melts, and 17 yet also one of the most difficult to study experimentally. Attempts to constrain its thermodynamic 18
Ternary Ca–Fe–Mg carbonates: subsolidus phase relations at 3.5 GPa and a thermodynamic solid solution model including order/disorder
Subduction carries atmospheric and crustal carbon hosted in the altered oceanic crystalline basement and in pelagic sediments back into the mantle. Reactions involving complex carbonate solid
The system Na2CO3–MgCO3 at 3 GPa
ABSTRACT It was suggested that Na–Mg carbonates might play a substantial role in mantle metasomatic processes through lowering melting temperatures of mantle peridotites. Taking into account that
Composition of primary kimberlite magma: constraints from melting and diamond dissolution experiments
Abstract Experiments are applied to constrain the composition of primary kimberlitic magmas which were in equilibrium with lithospheric peridotite and could resorb the entrained diamond to form
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 43 REFERENCES
The effect of bulk composition on the solidus of carbonated eclogite from partial melting experiments at 3 GPa
To explore the effect of bulk composition on the solidus of carbonated eclogite, we determined near-solidus phase relations at 3 GPa for four different nominally anhydrous, carbonated eclogites.
Carbonatitic melts along the solidus of model lherzolite in the system CaO-MgO-Al2O3-SiO2-CO2 from 3 to 7 GPa
Abstract We have experimentally determined the solidus position of model lherzolite in the system CaO-MgO-Al2O3-SiO2-CO2 (CMAS.CO2) from 3 to 7 GPa by locating isobaric invariant points where liquid
The solidus of carbonated, fertile peridotite
The solidus for a fertile peridotite composition (“Hawaiian pyrolite”) in the presence of CO2 has been determined from 14 to 35 kbar. The solidus shape inP-T space is consistent with previous studies
An experimental determination of primary carbonatite magma composition
Carbonatites are uncommon carbonate-rich rocks usually found in continental intra-plate regions and often associated with rifting. There has been much debate as to whether carbonatite magmas are
Experimental reconstruction of sodic dolomitic carbonatite melts from metasomatised lithosphere
Abstract Investigations of peridotite xenolith suites have identified a compositional trend from lherzolite to magnesian wehrlite in which clinopyroxene increases at the expense of orthopyroxene and
Deep global cycling of carbon constrained by the solidus of anhydrous, carbonated eclogite under upper mantle conditions
Abstract We present partial melting experiments that constrain the near solidus phase relations of carbonated eclogite from 2 to 8.5 GPa. The starting material was prepared by adding 5 wt.% CO2 in
Phase relations of amphibole, amphibole-carbonate, and phlogopite-carbonate peridotite: petrologic constraints on the asthenosphere
Abstract The subsolidus mineralogy and the isobarically-invariant solidus of peridotite in the presence of small amounts of H 2 O and CO 2 have been determined from 13.5 to 26 kbar pressure. The
Storage capacity of H2O in nominally anhydrous minerals in the upper mantle
Abstract The H 2 O storage capacity of nominally anhydrous minerals or rocks is the concentration of water that can be sequestered in the mineral(s) without stabilizing a hydrous fluid or melt. The
Experiments on CaCO3-MgCO3 solid solutions at high pressure and temperature
Abstract Multi-anvil experiments have been performed in the system CaCO3-MgCO3 at pressures of 5.0-7.0 GPa and temperatures of 800-1600 °C. The reaction dolomite = aragonite + magnesite has been
Mantle solidus: Experimental constraints and the effects of peridotite composition
[1] A review of experiments on natural peridotites allows improved constraints on the location of the mantle solidus. Available constraints on the location of the nominally dry peridotite solidus
...
1
2
3
4
5
...