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Ages of SNCs



dean bessey schrieb:

> ... long ago the meteorites were blasted off the Martian surface, ...
> How long the meteorites were in space, ...
> how long they have been on the earth.


Hello Dean and List,

                       Igneous    Exposure
                         age         age

                         (Ga)      (Ma)

Chassigny           1.3           10
Nakhla                1.3           11
Lafayette             1.3           11
Governador         1.3           09
Valadares
Zagami             0.18-1.3     2.6
Shergotty          0.18-1.3     2.5
ALHA 77005   0.18-1.3     2.8
EETA 79001    0.18-1.3     0.5

Dar al Gani 476:

Preliminary analysis  indicates the rock was ejected from Mars about 1
million years ago, and impacted Earth between 20,000 to 40,000 years
ago.

... exposure age 1.1  0.2 Ma ... (MetBull. 83, 1999, July).


Best wishes,

Bernd

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