TY - JOUR
T1 - Accretion and core formation on Mars
T2 - molybdenum contents of melt inclusion glasses in three SNC meteorites
AU - Richter, Kevin
AU - Hervig, Richard
AU - Kring, David A.
N1 - Funding Information:
We would like to thank G. Macpherson and L. Schramm for kindly loaning Smithsonian sections 624-1 and 624-2 of Chassigny; M. M. Lindstrom for loaning section LEW 88516, 21; and R. Friedman, A. J. Brearley, and K. Keil for loaning section UNM-480 of Governador Valadares. Discussions with and comments of M. J. Drake are greatly appreciated. Journal reviews of A. H. Treiman and K. W. W. Sims helped to clarify the presentation of this work. This research is supported through NASA Grants NAGW-3348, NAG5-4084, and NAGW-3373.
PY - 1998/6
Y1 - 1998/6
N2 - Molybdenum, cerium, barium, yttrium, and rubidium contents of glasses in melt inclusions in three SNC meteorites (LEW 88516, Governador Valadares, and Chassigny) have been measured by ion microprobe. Ratios of Mo/Ba and Mo/Ce have been used to estimate the Mo content of the primitive Martian mantle, 120±60 ppb. Abundances of five moderately siderophile elements (Ni, Co, Mo, W, and P) and Re in the Martian mantle are consistent with metal-silicate equilibrium between S-bearing metallic liquid (in a core 22 wt% of the planet) and peridotite melt at 75 kb, 1620°C, and oxygen fugacity 1.4 logfO2 units below the IW buffer. This homogeneous accretion scenario is different than many heterogeneous accretion models for the Earth, but similar to recent studies suggesting homogeneous accretion in the presence of a deep terrestrial magma ocean.
AB - Molybdenum, cerium, barium, yttrium, and rubidium contents of glasses in melt inclusions in three SNC meteorites (LEW 88516, Governador Valadares, and Chassigny) have been measured by ion microprobe. Ratios of Mo/Ba and Mo/Ce have been used to estimate the Mo content of the primitive Martian mantle, 120±60 ppb. Abundances of five moderately siderophile elements (Ni, Co, Mo, W, and P) and Re in the Martian mantle are consistent with metal-silicate equilibrium between S-bearing metallic liquid (in a core 22 wt% of the planet) and peridotite melt at 75 kb, 1620°C, and oxygen fugacity 1.4 logfO2 units below the IW buffer. This homogeneous accretion scenario is different than many heterogeneous accretion models for the Earth, but similar to recent studies suggesting homogeneous accretion in the presence of a deep terrestrial magma ocean.
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U2 - 10.1016/S0016-7037(98)00132-X
DO - 10.1016/S0016-7037(98)00132-X
M3 - Article
AN - SCOPUS:0032101497
SN - 0016-7037
VL - 62
SP - 2167
EP - 2177
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 12
ER -