[meteorite-list] H7 - L7 - LL7 statistics

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:41:09 2004
Message-ID: <3A8866C3.9A2DAFB6_at_lehrer1.rz.uni-karlsruhe.de>

Hello Listees and Listoids,

In the summary section of M.M. Grady's Fifth Edition of the
Meteorite Catalogue on p. 7, you find the following entries:

      Falls Finds Total (up to December 1999)
H7: 0 5 5 (3 are listed on p. 19)
L7: 0 15 15
LL7: 1 8 9 (7 are listed on p. 27)
E7: 0 1 1

My personal database (METCAT - up to Met.Bull. 85, July 2001):

H7: 0 4 4
L7: 0 18 18
LL7: 1 10 11
E7: 0 2 2


As for the transition from chondrites to achondrites:

LEVI F.A. et al. (1994) L7 Chondrites in FRO 90 Antarctic
Meteorite Collection (Meteoritics 29-4, 1994, A490):

A major problem in stony meteorite research appears to still be
unsolved. A clear identification of a petrologic transition from
chondritic to achondritic material is not yet obtained.

And:

TOSHIYUKI BABA et al. (1992) Mineralogy of Frontier Mountains
L7 chondrites with reference to the chondrite-achondrite transition
(Meteoritics 27-3, 1992, A199):

Achondrites have been generally assumed to be derived from magma
formed from some chondritic melts or mixtures, and the genetic
model often proposes specific crystallization sequences to account
for particular achondrite properties. However, some achondrites such
as primitive achondrites (Acapulco-type chondrites and/or Lodranites)
and ureilites still preserve primitive signatures of chondritic source
materials (Palme et al. 1981).


Best wishes
and Good Night,

Bernd
Received on Mon 12 Feb 2001 05:42:11 PM PST