[meteorite-list] Re: New Lunar? New Continent

From: Treiman, Allan <treiman_at_meteoritecentral.com>
Date: Thu Nov 4 15:33:41 2004
Message-ID: <7C188E1BAB399F4897C1F743DCD718363C6E77_at_exch_be.cass.loc>

Hi, Meteorite list --

   From the data in that abstract, I'd be very cautious
this rock.

   First, the data in the abstract are not consistent with
themselves. For isntance the rock is cited as 45% anorthite,
but only 3.7% Al2O3. Anorthite contains ~36% Al2O3, so a
rock that is 45% anorthite must contain at least 45% of 36%
Al2O3, or 16% Al2O3. Only a factor of four off!!!

   Second, the chemical analysis is far off any known a moon rock.
It shows 26.15% SiO2, which is not even enough if the rock were
all olivine. The rock has 5.38% MnO, which is way more than any
lunar rock. An earth rock with that much MnO would be mined as
ore! The analysis has CaO of 39.6%, which is way higher than
any moon rock -- lunar anorthosite has ~19% CaO, and mare basalts
have ~8-12% CaO.

   If it is lunar, its like nothing else.

   Allan


Allan H. Treiman
Senior Staff Scientist
Lunar and Planetary Institute
3600 Bay Area Boulevard
Houston, TX 77058-1113
   281-486-2117
   281-486-2162 (FAX)


-----Original Message-----
From: meteorite-list-bounces_at_meteoritecentral.com
[mailto:meteorite-list-bounces_at_meteoritecentral.com]On Behalf Of
Mikestockj_at_aol.com
Sent: Thursday, November 04, 2004 2:16 PM
To: meteorite-list_at_meteoritecentral.com; COMeteoriteClub@yahoogroups.com
Subject: [meteorite-list] Re: New Lunar? New Continent


Hi All
Just wanted to let the word out about the new possible Lunar meteorite. It is
a 3200 gram beauty from.........and no it is not the dry deserts of Africa or
Antarctica..... a little hint it's the first North American Lunar.....drum
roll please....Colorado. How exciting is that. I guess it is good/lucky to be in
Colorado (two achondrites in one year).
It is from Granada near Lamar for all of you Coloradans. That would be the
south eastern side of the state near Kansas for everybody else or about 200
miles SE of Denver.
Again it is only a possible Lunar.....but I'll keep you posted.
I have included an abstract to the upcoming Geological Society of America
meeting in Denver about the meteorite.

PRELIMINARY ANALYSIS OF A NEW ACHONDRITE (MARE BASALT?) OF POSSIBLE LUNAR
ORIGIN FROM NEAR GRANADA, COLORADO, USA

http://gsa.confex.com/gsa/2004AM/finalprogram/abstract_76183.htm

Time to go hunt......anyone want to go. Oops I'm half way there. :)

Mike


Mike Jensen IMCA 4264
Bill Jensen IMCA 2359
Jensen Meteorites
16730 E Ada PL
Aurora, CO 80017-3137
303-337-4361
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Received on Thu 04 Nov 2004 03:33:37 PM PST