Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3437d&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3437
Computer Science
Scientific paper
The Rb-Sr and Pb-Pb isotopic systematics of the SNC meteorites postulated as Martian rocks indicate a very early differentiation process in 3 isotopically distinct reservoirs on Mars, which remained isolated for a period of 4.3±0.2 Ga. These reservoirs are: 1) The crust, enriched in radiogenic Sr and Pb as well as in Xe-129. The observed higher 129Xe/132Xe ratio in the Martian atmosphere compared to the interior of Mars points also to a very early extraction of iodine in the crust because of the short 129-I half-life of 16 my. 2) The early formation of the enriched crust has caused the early depletion of the mantle indicated by the primitive Sr and Pb isotopes and the excess 142Nd in mantle derived SNCs. 3) A third Martian meteorite group with intermediate Sr isotopic composition and a relatively undifferentiated chemical composition might originate from a primitve unfractionated mantle. The Hf-W systematics in SNCs [1, 2, and 3] also reveal a rapid accretion of their parent body and a very early core mantle differentiation during the first 30 Ma. Since the isotopic signature of the primary differentiation is preserved, plate tectonic activity and crustal recycling back to the mantle must be absent on Mars. This is in contrast to the geochemical evolution of the Earth. On Earth isotopic signature remains of the early evolution are obscured by tectonic activities. The absence of plate tectonic activity on early Mars excludes a crustal recycling. Ref.: [1] Lee D.C. &Halliday A.N. (1997) Nature 388, 854--857. [2] Yin Q. et al. (2002) Nature 418, 949--951. [3] Kleine T. et al. (2002) Nature 418, 952--955.
Dreibus Gerlind
Jagoutz Emil
No associations
LandOfFree
Early planetary differentiation processes on Mars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Early planetary differentiation processes on Mars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Early planetary differentiation processes on Mars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-842525