[meteorite-list] Hadley Rille (EH)

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Fri Sep 1 16:10:35 2006
Message-ID: <DIIE.0000007200000C6E_at_paulinet.de>

Best wishes, Bernd


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, 135-141):

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 and 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.

Hadley Rille, 26? 26.0' N / 3? 39.33' E, 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 (Met.Bull. 81, 1997, A160).
Received on Fri 01 Sep 2006 03:14:37 PM PDT