Geology Reference
In-Depth Information
Andrew Beck, Linda Welzenbach, and Kat Gardner-
Vandy (SI) all contributed ideas and commented on
earlier versions of this manuscript, which significantly
improved its clarity and utility. I am particularly grateful
to the Smithsonian Institution for supporting my efforts
in studying these weird and wonderful samples for the
past 17 years.
REFERENCES
Beck, A. W., and H. Y. McSween Jr. (2010), Diogenites as poly-
mict breccias composed of orthopyroxenite and harzburgite,
Meteoritics Planet. Sci., 45 , 850-872.
Beck, A. W., J. M. Sunshine, T. J. McCoy, and T. Hiroi (2012),
Challenges to finding olivine on the surface of 4Vesta
(abstract), Lunar Planet. Sci., 43 , CD #2218.
Bischoff, A., and K. Keil (1983), Ca-Al-rich chondrules and
inclusions in ordinary chondrites, Nature, 303 , 588-592.
Bogard, D. D., and D. H. Garrison (2003), 39 Ar- 40 Ar ages of
eucrites and thermal history of asteroid 4 Vesta, Meteoritics
Planet. Sci., 38 , 669-710.
Burbine, T. H., T. J. McCoy, and T. L. Dickinson (2000), Origin
of plagioclase-“enriched,” igneous, enstatite meteorites
(abstract), 63rd Meteoritical Society Meeting, #5158.
Cohen, B. A., T. D. Swindle, and D. A. Kring (2000), Support
for the lunar cataclysm hypothesis from lunar meteorite
impact melt ages. Science, 290 , 1754-1756.
Corrigan, C. M., B. A. Cohen, K. Hodges, N. Lunning , and
E. Bullock (2012), 3. 9 billion years ago and the asteroid belt:
Impact melts in ordinary chondrites, Lunar Planet. Sci., 43,
#1577.
Day, J. M. D., R. J. Walker, R. D. Ash, Y. Liu, D. Rumble III, A. J.
Irving, C. A. Goodrich, K. Tait, W. F. McDonough, and L. A.
Taylor (2012), Origin of felsic achondrites Graves Nunataks
06128 and 06129, and ultramafic brachinites and brachinite-
like achondrites by partial melting of volatile-rich primitive
parent bodies, Geochim. Cosmochim. Acta, 81 , 94-128.
Fogel, R. A. (1997), On the significance of diopside and old-
hamite in enstatite chondrites and aubrites, Meteoritics
Planet. Sci., 32 , 577-591.
Goodrich, C. A., and K. Righter (2000), Petrology of unique
achondrite Queen Alexandra Range 93148: A piece of the
pallasite
Figure 8.4. The unbrecciated, metamorphosed diogenite
Grosvenor Mountains 95555 formed during high-grade thermal
metamorphism at sufficient depth to escape brecciation. The
Dawn mission has revealed the importance of impact basins in
the geologic evolution of 4 Vesta, which is thought to be the
source asteroid for the howardite-eucrite-diogenite clan of
meteorites. GRO 95555 might provide important clues to both
the nature and timing of metamorphism on 4 Vesta. Scale bar
is 1 mm.
basin-forming events a major heat source? Alternatively,
was metamorphism unrelated to impact, instead resulting
from global burial metamorphism [e.g., Yamaguchi et al .,
1997]? In any of these models, metamorphosed HEDs
might provide important clues to both the nature and
timing of metamorphism on 4 Vesta.
8.9. CONCLUSIONS
The Antarctic meteorite program has revolutionized
our understanding of the evolution of our solar system in
large part because of the steady production of new, inter-
esting, and sometimes unexpected meteorites. These mete-
orites challenge our concepts and fill in gaps in our
knowledge. It is important to recognize, however, that the
missing pieces of the puzzle often already exist in our col-
lection, awaiting rediscovery through future recovery, ana-
lytical breakthrough, or changing paradigm that will
allow us to fully reveal the picture of the early solar system.
(howardite-eucrite-diogenite?)
parent
body?
Meteoritics Planet. Sci., 35 , 521-535.
Gross, J., A. H. Treiman, and H. C. Connolly Jr. (2013), A new
subgroup of amphibole-bearing R-chondrites: Evidence
from the new R chondrite MIL 11207, 44th Lunar Planet.
Sci. Conf., #2212.
Grossman, J. N., G. J. MacPherson, W. Hsu, and E. K. zinner
(1995), Plagioclase-rich objects in the ungrouped E3 chon-
drite Lewis Cliff 87234: Petrology and aluminum-magnesium
isotopic data (abstract), Meteoritics, 30 , 514.
Izawa, M. R. M., R. L. Flemming, N. R. Banerjee, and
S. Mateev (2011), QUE 94204: A primitive enstatite achondrite
produced by the partial melting of an E chondrite-like proto-
lith, Meteoritics Planet. Sci., 46 , 1742-1753.
Acknowledgments . This chapter would not have been
possible without the  dedicated efforts of all involved in
the U.S. Antarctic Meteorite Program and the passion of
the meteoritics community in driving our scientific explo-
ration of the early solar system. My colleagues Ralph
Harvey (Case), Kevin Righter (JSC), Cari Corrigan,
Emma Bullock, Glenn MacPherson, Yulia Goreva,
Search WWH ::




Custom Search