New Martian Meteorite: Northwest Africa (NWA 7034)

1
New Martian MeteoriteNorthwest Africa (NWA 7034)
Meteorite NWA 7034 is a breccia, with minerals
and rock fragments set in a fine-grained glassy
matrix.
2
Evidence for a Martian Origin
Mn and Fe concentrations in pyroxene is an
effective way to distinguish rocks from different
planetary bodies. Note that the data for NWA 7034
fall along the line defined by Martian meteorites.
3
New Martian Meteorite is Similar toTypical
Martian Crust
TAS diagram for classification of igneous rocks.
NWA 7034 falls with rocks and soils from the
surface and mean surface measured from orbit
(GRS) Martian meteorites (SNC) are depleted in
alkalis.
4
Distinctive Mantle Source Region
NWA 7034 has different REE abundances and
pattern, and slightly different oxygen isotopic
compositions compared to known Martian
meteorites.
5
NWA 7034 Older Than Most Martian Meteorites
Martian meteorite ages ALH 84001 4100 Ma NWA
7034 2089 Ma Nakhlites Chassigny 1300
Ma Shergottites 170-575 Ma