The composition of Mars
The composition of Mars
复制标题
火星的组成
DOI:
10.1016/j.gca.2020.01.011
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发表时间:
2020
影响因子:
5
通讯作者:
McDonough, William F.
中科院分区:
文献类型:
--
作者:
Yoshizaki, Takashi;McDonough, William F.
Comparing compositional models of the terrestrial planets provides insights into physicochemical processes that produced planet-scale similarities and differences. The widely accepted compositional model for Mars assumes Mn and more refractory elements are in CI chondrite proportions in the planet, including Fe, Mg, and Si, which along with O make up> 90% of the mass of Mars. However, recent improvements in our understandings on the composition of the solar photosphere and meteorites challenge the use of CI chondrite as an analog of Mars. Here we present an alternative model composition for Mars that avoids such an assumption and is based on data from Martian meteorites and spacecraft observations. Our modeling method was previously applied to predict the Earth’s composition. The model establishes the absolute abundances of refractory lithophile elements in the bulk silicate Mars (BSM) at 2.26 times higher than that in CI carbonaceous chondrites. Relative to this chondritic composition, Mars has a systematic depletion in moderately volatile lithophile elements as a function of their condensation temperatures. Given this finding, we constrain the abundances of siderophile and chalcophile elements in the bulk Mars and its core. The Martian volatility trend is consistent with⩽ 7 wt% S in its core, which is significantly lower than that assumed in most core models (ie,> 10 wt% S). Furthermore, the occurrence of ringwoodite at the Martian core-mantle boundary might have contributed to the partitioning of O and H into the Martian core.
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影响因子:
5
作者:
A. Udry;J. Day
通讯作者:
J. Day
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
E. Médard;A. Martin;M. Collinet;K. Righter;T. Grove;M. Newville;A. Lanzirotti
通讯作者:
A. Lanzirotti
DOI:
10.1098/rsta.1994.0132
发表时间:
1994-11
期刊:
Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences
影响因子:
--
作者:
H. Wänke;G. Dreibus
通讯作者:
H. Wänke;G. Dreibus
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
W. McDonough
通讯作者:
W. McDonough
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
H. McSween
通讯作者:
H. McSween