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Manganese partitioning during hydrous melting of peridotite

Balta, J. Brian and Mosenfelder, Jed L. and Asimow, Paul D. (2011) Manganese partitioning during hydrous melting of peridotite. Geochimica et Cosmochimica Acta, 75 (20). pp. 5819-5833. ISSN 0016-7037.

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Manganese contents and the iron/manganese ratio of igneous rocks have been used as a method of probing the heterogeneity in the Earth’s mantle during melting of peridotite and pyroxenite lithologies. Most previous work has assumed that changes in these parameters require differences in either source lithology or composition based on experiments indicating that manganese is slightly incompatible during melting and that the iron/manganese ratio is fixed by the presence of olivine. However, the presence of volatiles in the mantle drives melting at lower temperatures and with different compositions than in volatile-free systems, and thus the partitioning of Fe and Mn may in fact vary. We have produced silicate liquids in equilibrium with a peridotite assemblage under hydrous conditions at 3 GPa that show that Mn can also be unexpectedly compatible in garnet at 1375 °C and that Mn partitioning between solids and liquids can be strongly affected by temperature and liquid composition. The compatibility of Mn in garnet provides a mechanism for large variations of Mn contents and the Fe/Mn ratio in silicate melts that solely involves melting of mantle peridotite with only small compositional changes. Correlations between Mn variations and other indices indicative of melting in the presence of garnet may provide a means of more completely understanding the role of garnet at high pressures in peridotite melting.

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Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2011 Elsevier Ltd. Received 28 June 2010; accepted in revised form 10 November 2010; available online 25 May 2011. Associate editor: Michael Toplis. The authors thank Andrew Matzen and Mike Baker for illuminating discussions regarding the behavior and analysis of MnO in experiments. Associate Editor Michael Toplis, reviewer Claude Herzberg, and an anonymous reviewer helped improve the manuscript. This work was supported by the NSF Ocean Sciences Marine Geology and Geophysics program, Grant Nos. OCE-0241716 and OCE-0550216.
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NSF Ocean Sciences Marine Geology and Geophysics programOCE-0241716
NSF Ocean Sciences Marine Geology and Geophysics programOCE-550216
Issue or Number:20
Record Number:CaltechAUTHORS:20111107-075300895
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Official Citation:J. Brian Balta, Paul D. Asimow, Jed L. Mosenfelder, Manganese partitioning during hydrous melting of peridotite, Geochimica et Cosmochimica Acta, Volume 75, Issue 20, 15 October 2011, Pages 5819-5833, ISSN 0016-7037, 10.1016/j.gca.2011.05.026. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27637
Deposited By: Ruth Sustaita
Deposited On:07 Nov 2011 16:11
Last Modified:03 Oct 2019 03:25

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