Journal Title
Title of Journal: Contrib Mineral Petrol
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Abbravation: Contributions to Mineralogy and Petrology
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Publisher
Springer Berlin Heidelberg
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Authors: Audrey M Martin Kevin Righter
Publish Date: 2013/07/09
Volume: 166, Issue: 4, Pages: 1067-1098
Abstract
The assemblage clinopyroxene + magnesite was observed in Earth’s highpressure metamorphic samples and its stability in subducting slabs was confirmed by experiments Recent studies also suggested that the fO2 variations observed in SNC meteorites can be explained by polybaric graphiteCOCO2 equilibria in the Martian mantle Although there is no direct evidence for the stability of the cpx + mc assemblage in Mars mantle its highpressure–hightemperature decomposition to cpx + fo + CO2 makes it a good analogue for the source of carbon metasomatism in particular to study nakhlites formation Iron which is present in the Earth’s and Martian mantles may however influence the speciation of carbon We performed experiments on a clinopyroxene + magnesite assemblage at 18 and 30 GPa and temperatures corresponding to the Earth’s and Martian mantles The role of iron and of fO2 was investigated by 1 replacing all or part of the magnesite by siderite FeCO3 2 adding Fe0 and 3 using graphite C capsules A carbonatesilicate melt forms at both Earth and Mars conditions Clinopyroxene and olivine are the main solid phases in the ironfree experiments Fe2+ and Fe0 decrease their melting temperatures and increase the silicate fraction in the melt The produced carbonatesilicate melts may be involved in the formation of some carbonrich lavas on Earth eg carbonatites ultramafic lamprophyres or kamafugites Our results may also be used to interpret ophiolite samples or inclusions In particular we show that wüstite may form in equilibrium with carbonatesilicate melt in opxand silica poor regions of the mantle below 3 GPa Our results also confirm the hypothesis of carbon metasomatism in the Martian nakhlites source Immiscibility or reduction could explain the absence or rarity of C in Martian lavasK Pando and L R Danielson are gratefully acknowledged for their support on the experimental devices A Peslier G Robinson and K Ross for their help on the microscopes L Le for her assistance during Raman analyses and S Sutton and M Newville for their support during XANES analyses E Médard is also acknowledged for his insightful comments We thank three anonymous reviewers for their comments and Gordon Moore for his editorial work This research was supported by an appointment to the NASA Postdoctoral Program at the Johnson Space Center administered by Oak Ridge Associated Universities through a contract with NASA and by an RTOP to KR from the Mars Fundamental Research Program Portions of this work were performed at GeoSoilEnviroCARS Sector 13 Advanced Photon Source APS Argonne National Laboratory GeoSoilEnviroCARS is supported by the National Science Foundation—Earth Sciences EAR1128799 and Department of Energy—Geosciences DEFG0294ER14466 Use of the Advanced Photon Source was supported by the U S Department of Energy Office of Science Office of Basic Energy Sciences under Contract no DEAC0206CH11357
Keywords:
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Other Papers In This Journal:
- Precise estimation of pressure–temperature paths from zoned minerals using Markov random field modeling: theory and synthetic inversion
- Formation of cordierite-bearing lavas during anatexis in the lower crust beneath Lipari Island (Aeolian arc, Italy)
- An Early Cretaceous garnet pressure–temperature path recording synconvergent burial and exhumation from the hinterland of the Sevier orogenic belt, Albion Mountains, Idaho
- Crystal reaming during the assembly, maturation, and waning of an eleven-million-year crustal magma cycle: thermobarometry of the Aucanquilcha Volcanic Cluster
- Origin of phlogopite-orthopyroxene inclusions in chromites from the Merensky Reef of the Bushveld Complex, South Africa
- An empirical garnet (YAG) – xenotime thermometer
- Magma storage and mixing conditions for the 1953–1974 eruptions of Southwest Trident volcano, Katmai National Park, Alaska
- In situ Re–Os isotopic analysis of platinum-group minerals from the Mayarí-Cristal ophiolitic massif (Mayarí-Baracoa Ophiolitic Belt, eastern Cuba): implications for the origin of Os-isotope heterogeneities in podiform chromitites
- Reply to comments by Sengupta, Raith and Dasgupta on S. B. Bhattacharya and R. K. Kar (2002)
- Trace element mapping by LA-ICP-MS: assessing geochemical mobility in garnet
- Metasomatized lithospheric mantle beneath Turkana depression in southern Ethiopia (the East Africa Rift): geochemical and Sr–Nd–Pb isotopic characteristics
- In situ observations of bubble growth in basaltic, andesitic and rhyodacitic melts
- NanoSIMS mapping and LA-ICP-MS chemical and U–Th–Pb data in monazite from a xenolith enclosed in andesite (Central Slovakia Volcanic Field)
- Phosphorus-controlled trace element distribution in zircon revealed by NanoSIMS
- Hydroxyl in olivines from mantle xenoliths in kimberlites of the Siberian platform
- Electrical conductivity of orthopyroxene and plagioclase in the lower crust
- Chromite in komatiites: 3D morphologies with implications for crystallization mechanisms
- In situ Sr isotopic analyses of epidote: tracing the sources of multi-stage fluids in ultrahigh-pressure eclogite (Ganghe, Dabie terrane)
- Source components of the Gran Canaria (Canary Islands) shield stage magmas: evidence from olivine composition and Sr–Nd–Pb isotopes
- The stability and origin of sodicgedrite in ultrahigh-temperature Mg-Al granulites: a case study from the Gondwana suture in southern India
- Plagioclase in the Skaergaard intrusion. Part 1: Core and rim compositions in the layered series
- The Campanian Ignimbrite (southern Italy) geochemical zoning: insight on the generation of a super-eruption from catastrophic differentiation and fast withdrawal
- Immiscible separation of metalliferous Fe/ Ti-oxide melts from fractionating alkali basalt: P - T - f O2 conditions and two-liquid elemental partitioning
- Experimental calibration of a garnet–clinopyroxene geobarometer for mantle eclogites
- A case for hornblende dominated fractionation of arc magmas: the Chelan Complex (Washington Cascades)
- Melting phase relations of a mica–clinopyroxenite from the Milk River area, southern Alberta, Canada
- Shoshonite and sub-alkaline magmas from an ultrapotassic volcano: Sr–Nd–Pb isotope data on the Roccamonfina volcanic rocks, Roman Magmatic Province, Southern Italy
- The role of slab melting in the petrogenesis of high-Mg andesites: evidence from Simbo Volcano, Solomon Islands
- Evolution of the Taupo Volcanic Center, New Zealand: petrological and thermal constraints from the Omega dacite
- Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia
- Hercynian, Pan-African, Proterozoic and Archean ion-microprobe zircon ages for a Betic-Rif core complex, Alpine belt, W Mediterranean – consequences for its P - T - t path
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