Geology Reference
In-Depth Information
12
Number of lunar meteorites by year
N
= 89
10
Antarctica 22%
8
Australia 2%
Africa 46%
Oman 29%
6
4
2
0
1980
1985
1990 1995
Find or purchase year
2000
2005
2010
Figure 6.21.
Number of lunar meteorites by find or purchase year. For paired stones, the find year of the first found stone of
the pair group is represented. The rate of lunar finds from Antarctica (ANSMET and NIPR) has remained rather constant over
the 35-year time period.
Although the number of lunar meteorites from hot
deserts (about 78%) substantially exceeds those from
Antarctica, most meteorites from hot deserts are con-
taminated, to varying degrees, with products of terres-
trial alteration, whereas there is little evidence for even
minor postfall changes in bulk composition among the
lunar meteorites in the ANSMET and NIPR collection.
Most hot-desert meteorites are seriously contaminated
with Sr and Ba (Figure 6.20), but enrichments in Na,
K, Ca, P, Zn, As, Se, Br, Sb, Au, U, carbonates, and
sulfates have also been recorded [e.g.,
Zeigler et al
.,
2006;
Korotev
, 2012].
Perhaps because of the systematic way in which
ANSMET and NIPR searches are done, the find rate of
lunar meteorites in Antarctica has been constant over the
past 35 years (Figure 6.21). This constancy suggests that
continued searching will yield more lunar meteorites
from Antarctica.
REFERENCES
Anand, M., L. A. Taylor, C. R. Neal, G. A. Snyder,
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Geochim. Cosmochim. Acta
,
67
, 3499-3518.
Anand, M., L. A. Taylor, C. Floss, C. R. Neal, K. Terada, and
S. Tanikawa (2006), Petrology and geochemistry of LaPaz
Icefield 02205: A new unique low-Ti mare-basalt meteorite,
Geochim. Cosmochim. Acta
,
70
, 246-264.
Arai, T., and P. H. Warren (1999), Lunar meteorite Queen
Alexandra Range 94281: Glass compositions and other evi-
dence for launch pairing with Yamato 793274,
Meteorit.
Planet. Sci.
,
34
, 209-234.
Arai, T., T. Ishi, and M. Otsuki (2002), Mineralogical study of
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,
XXXIII
, abstract 2064.
Arai, T., K. Misawa, and H. Kojima (2005), A new lunar mete-
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Lunar Planet. Sci.
,
XXXVI
, abstract 2361.
Arai, T., K. Misawa, and H. Kojima (2007), Lunar meteorite
MIL 05035: mare basalt paired with Asuka-881757,
Lunar
Planet. Sci.
,
XXXVIII
, abstract 1582.
Arai, T., H. Takeda, A. Yamaguchi, and M. Ohtake (2008),
A new model of lunar crust: asymmetry in crustal compo-
sition and evolution,
Earth, Planets and Space
,
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433-444.
Arai, T., B. R. Hawke, T. A. Giguere, K. Misawa,
M. Miyamoto, and H. Kojima (2010), Antarctic lunar
meteorites Yamato-793169, Asuka-881757, MIL 05035,
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Geochim. Cosmochim. Acta
,
Acknowledgments
This work was funded by NASA
grants NAG5-8609, NAG5-4172, NNG04GG10G, and
NNX07AI44G. We thank the Antarctic Search for
Meteorites (U.S.), Antarctic Meteorite Research Center
of the National Institute of Polar Research (Japan),
Cecilia Satterwhite, Kathleen McBride, and John Schutt
for finding and providing these wonderful rocks and
information about them. Many thanks to Mark Robinson
for calling the
Shoemaker et al
. [1963] work to our
attention and Brad Jolliff for constructing Figure 6.1. We
appreciate the helpful reviews of Barb Cohen, Paul
Warren, and editor Cari Corrigan.
74
,
2231-2248.
