[meteorite-list] Dry Lake Stewnfields??

From: Robert Verish <bolidechaser_at_meteoritecentral.com>
Date: Thu Apr 22 10:17:50 2004
Message-ID: <20031218031211.62037.qmail_at_web60302.mail.yahoo.com>

Mark's post reminded me that I never properly answered
Tom's original Gold Basin question.

In D. Kring et al (2001) "Gold Basin Meteorite Strewn
Field..." this is the only mention of post-fall
transportation in the entire paper:

"The locations of the samples, particularly those on
bedrock, indicate they have not been significantly
transported after impact."

Again, not my words. And I'm not going to comment.

But there is an image in this article that shows a
Gold Basin stony locked into a "desert pavement" and a
description that speaks of this stony having a coating
of "desert varnish". Given the long duration of time
required to develop this kind of patina on an
immobilized sediment, this speaks to me more of
minimal transportation after impact.

And then there's this desert-varnished GB find in my
collection that was found buried 6inches down and
under a cobble! No there's a suspect waypoint, and it
has a very low weighting on my GB strewn field map
(along with any find from a steeply sloping surface).
;-)
Bob V.

--- Mark Jackson <chaositymeteoritics_at_yahoo.com>
wrote:
> Rob, Bob and Listers,
>
> I embrace Bob's descriptive term for scattered, but
> paired, drylake finds as accumulation zones. I
> believe that is the term used to describe the areas
> on the Antarctic ice sheet where meteorites by the
> armloads seem to be "gathered". The fact of the
> matter is, the meteorites, whether landing here or
> in Antarctica, join a world where the forces of
> fluid dynamics act incessantly to move them from
> thier original location. Does it mean find data is
> useless for mapping weight distributions of these
> zones . . . yes and no (maybe). If the fall is young
> enough then clearly there has been little time to
> interfere with the distribution, and it's probably
> trusty info; there are other cases like Gold Basin
> where there not only wasn't any observable weight
> distribution in the ~3000 finds recorded but also
> 3-4 other unrelated, independent finds within the
> strewnfield! How does THAT happen? For my money, for
> whatever reason, Gold Basin is a super-accumulation
> zone for the desert in that region.
>
> Anyway, regardless of whether sf data can be
> trusted, the Garmin GPS gets queried and recorded
> everytime I collect a candidate in the field;
> followed by an expanding circle search out to at
> least a couple of hundred yards for pairings.
>
> Happy holidays folks . . .
>
> Mark Jackson
> Chaosity Meteoritics
> chaositymeteoritics_at_yahoo.com
>
> ---------------------------------


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Received on Wed 17 Dec 2003 10:12:11 PM PST