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Re: Meteorites Found in Lunar Samples?
Martin Horejsi schrieb:
> Here is an entry from the The Meteoritical Bulletin, No. 81, 1997 July
>
> which may be of interest in this discussion.
>
> Martin
>
> Here is the URL if anyone is interested:
> http://www.uark.edu/studorg/metsoc/metbull/bull81-f.htm
>
> Hadley Rille
> Lunar: 26º26.0'N 3º39.33'E
>
> The Moon
> Found 1971 July-August
> Enstatite chondrite (EH)
>
> An object in the 1-2 mm size fraction of soil sample 15602,29 was
> recovered
> by Apollo 15 astronauts at Station 9, near Hadley Rille; the original
> mass,
> estimated from the thin section, was ~3 mg. Mineralogy and
> classification
> (Haggerty, 1972, and A. Rubin, UCLA): contains enstatite, kamacite
> (2.9-3.2% Si), niningerite, silica, schreibersite, troilite, albite,
> and
> daubreelite. Specimen: Lunar Sample Curator, JSC.
Hello Martin, hello List,
Here is some more:
Haggerty S.E. (1972) An enstatite chondrite from Hadley Rille (abs.
Apollo 15 Lunar Samples, pp. 85-87, Lunar Science Inst., Houston,
Texas).
RUBIN A.E. (1997) The Hadley Rille enstatite chondrite and its
agglutinate-like rim: Impact melting during accretion to the Moon
(Meteoritics 32-1, 1997, 135):
Abstract - Hadley Rille is a millimeter-size EH chondrite containing
euhedral and acicular enstatite grains, kamacite globules and
preferentially aligned silicate aggregates separated by elongated
kamacite-rich patches. The Hadley Rille chondrite was significantly
impact melted when it accreted to the lunar regolith at relative
velocities of greater than or equal to 3 km s-1; ~65-75% of the
chondrules present initially were melted. During the impact, portions of
the local regolith were melted a nd an agglutinate-like rim formed
around the chondritic projectile; the rim consists of flow-banded
vesicular glass, blebs of troilite and low-Ni metallic Fe, rock
fragments, glass(?) shards and mineral grains. The mineral grains
include enstatite (which is otherwise absent from the Moon and must have
been derived from the projectile) and poorly characterized,
micrometer-size phases enriched in LREE (which probably formed during
the impact). Several of the rock fragments contain greater than or equal
to 33 mg/g Cl, probably derived through impact-induced volatilization of
Cl from chondrule mesostases in the EH projectile.
Regards, Bernd
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