Silver contents and Cu/Ag ratios in Martian meteorites and the implications for planetary differentiation

2017 ◽  
Vol 216 ◽  
pp. 96-114 ◽  
Author(s):  
Zaicong Wang ◽  
Harry Becker
Keyword(s):  
Martian Meteorites ◽  
Planetary Differentiation

scholarly journals Evidence for Past Life on Early Mars: How the Evidence Stands

2004 ◽  
Vol 213 ◽  
pp. 203-208 ◽  
Author(s):  
Everett K. Gibson ◽  
Kathie L. Thomas-Keprta ◽  
Simon J. Clemett ◽  
David S. Mckay ◽  
Christopher Romanek ◽  
...  
Keyword(s):  
Scientific Community ◽  
Current Status ◽  
Martian Meteorite ◽  
Martian Meteorites ◽  
Past Life ◽  
Early Mars ◽  
World’S Scientific Community

Martian Meteorite ALH84001 contains four unusual features which have been interpreted as possible signatures of relic biogenic activity. After six years of intense study by the world's scientific community, the current status of the biogenic hypothesis is reviewed and shown to still be valid. Furthermore additional features have been observed in two younger Martian meteorites. The strongest argument for possible evidence of biogenic activity within the ALH84001 meteorite is the presence of truncated hexa-octahedral magnetite crystals which are only known on Earth to be the products of biology.

scholarly journals What martian meteorites reveal about the interior and surface of Mars

2020 ◽  
Author(s):  
Arya Udry ◽  
Geoffrey Hamilton Howarth ◽  
Christopher Herd ◽  
James Day ◽  
Thomas John Lapen ◽  
...  
Keyword(s):  
Martian Meteorites

Compressibility of water in magma and the prediction of density crossovers in mantle differentiation

2008 ◽  
Vol 366 (1883) ◽  
pp. 4239-4252 ◽  
Author(s):  
Carl B Agee
Keyword(s):  
High Pressure ◽  
Compressible Liquid ◽  
Silicate Melt ◽  
Liquid Density ◽  
Low Velocity ◽  
Oxide Component ◽  
The Earth ◽  
Liquid Oxide ◽  
Planetary Differentiation ◽  
Pressure Regime

Hydrous silicate melts appear to have greater compressibility relative to anhydrous melts of the same composition at low pressures (<2 GPa); however, at higher pressures, this difference is greatly reduced and becomes very small at pressures above 5 GPa. This implies that the pressure effect on the partial molar volume of water in silicate melt is highly dependent on pressure regime. Thus, H 2 O can be thought of as the most compressible ‘liquid oxide’ component in silicate melt at low pressure, but at high pressure its compressibility resembles that of other liquid oxide components. A best-fit curve to the data on from various studies allows calculation of hydrous melt compression curves relevant to high-pressure planetary differentiation. From these compression curves, crystal–liquid density crossovers are predicted for the mantles of the Earth and Mars. For the Earth, trapped dense hydrous melts may reside atop the 410 km discontinuity, and, although not required to be hydrous, atop the core–mantle boundary (CMB), in accord with seismic observations of low-velocity zones in these regions. For Mars, a density crossover at the base of the upper mantle is predicted, which would produce a low-velocity zone at a depth of approximately 1200 km. If perovskite is stable at the base of the Martian mantle, then density crossovers or trapped dense hydrous melts are unlikely to reside there, and long-lived, melt-induced, low-velocity regions atop the CMB are not predicted.

scholarly journals Shock-induced transformation of olivine to a new metastable (Mg,Fe)2SiO4 polymorph in Martian meteorites

2007 ◽  
Vol 261 (3-4) ◽  
pp. 469-475 ◽  
Author(s):  
Bertrand Van de Moortèle ◽  
Bruno Reynard ◽  
Paul F. McMillan ◽  
Mark Wilson ◽  
Pierre Beck ◽  
...  
Keyword(s):  
Martian Meteorites

The nature of Martian fluids based on mobile element studies in salt-assemblages from Martian meteorites

2008 ◽  
Vol 113 (E6) ◽  
Author(s):  
M. N. Rao ◽  
L. E. Nyquist ◽  
S. J. Wentworth ◽  
S. R. Sutton ◽  
D. H. Garrison
Keyword(s):  
Mobile Element ◽  
Martian Meteorites

scholarly journals Oxygen Isotope Thermometry of DaG 476 and SaU 008 Martian Meteorites: Implications for Their Origin

Geosciences ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 15
Author(s):  
Arshad Ali ◽  
Iffat Jabeen ◽  
Sobhi Nasir ◽  
Neil Banerjee
Keyword(s):  
Oxygen Isotope ◽  
Martian Meteorites
Sign in / Sign up

Export Citation Format

Share Document