Geology Reference
In-Depth Information
matrix CAI/AOA inclusions, metal, presolar grains,
isotopic studies, and organics [see
Weisberg and Righter
,
2014 (this volume)]. Many Antarctic CR2s have provided
materials for a variety of studies; however, they have
been heavily requested and are of limited size, and thus
availability of material has become steadily smaller for
some samples. Two examples are given: 128.9-g GRA
95229 and pairing group EET 92042 (Figure 3.16;
Plate 25).
GRA 95229 has been an important sample for organic
geochemists, with a diversity of compounds being dis-
covered and analyzed including amino acids, hydroxyl
acids, and ammonia [
Pizzarello et al
., 2008, 2010, 2011].
Although it was originally >100 g, its popularity has
resulted in ~50% of the original mass remaining for study
(Figure 3.16).
Studies of EET 92042 (Plate 25), which is a highly
primitive sample, have produced interesting results
on organics, presolar grains, chondrules, and inclusions
[
Busemann et al
., 2006;
Glavin et al
., 2010;
Schrader et al
.,
2011;
Makide et al
., 2009]. Even though it is 45 g with
only 45% left from the original mass, it is paired with
nearly 50 other samples as part of a large pairing group
spanning several collection seasons (1987, 1990, and
1992), with a combined mass of 1342.6 g. Collectively,
there are 304.2 g of material remaining at JSC (from 22
specimens or 22.7% of available mass) and 941.3 g of
material at SI (from 46 specimens or 70.1% of available
mass), with 97.1 g allocated to scientists for various
studies (7.2% of available mass).
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3.4. SUMMARY
The U.S. Antarctic meteorite collection has grown
more than anyone could have predicted in 1980. The cura-
tion of the samples has benefitted from the combined
resources and genial cooperation of the three managing
agencies. Rapid characterization of the hundreds of mete-
orites collected over more than 35 seasons has allowed
community access to samples of high scientific interest.
Detailed documentation of their handling and proces-
sing, as well as the safe and secure storage, has enabled
researchers to access samples from Earth's Moon, Mars,
and asteroids, to know their detailed history and to have
material available for future studies using approaches and
techniques that may not even have been developed yet.
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