[meteorite-list] Czech meteorite fragments 20 years
Mark Bowling
minador at yahoo.com
Thu Oct 16 13:49:11 EDT 2014
Thanks Carl I see that others have commented too. I wrote last night but didn't execute until today.
I hope to hear more soon. Pretty interesting topic.:-)
Regards,
Mark
From:"Carl Esparza via
Meteorite-list"
<meteorite-list at meteoritecentral.com>
Date:Thu, Oct 16, 2014 at 7:23 AM
Subject:Re: [meteorite-list] Czech meteorite
fragments 20 years
Hi Mark,
These
guys are legit.
http://cs.wikipedia.org/wiki/Pavel_Spurn%C3%BD
Hope all is well with you.
Carl
Meteoritemax
--
Love &
Life
---- Mark Bowling via
Meteorite-list <meteorite-list at meteoritecentral.com>
wrote:
> Just to play Devil's
advocate, is this desert varnish,
or some kind of reaction to a humid, heavily mineralized
soil? Have they been shared with other institutions?
It's implied that they were found buried in the
ground. Perhaps they did find them, and it's some sort
of alteration caused by local ard/gossan conditions.
Any geos on there who might
know of a mechanism that could cause a similar looking
weathering product? These are just photos, which, more
often than not, are very hard to interpret. I'm partly
curious as I've observed some interesting rocks while
prospecting high sulfide locations.
Assuming they were genuinely found, in such
conditions it may be possible they are 20 years old. Or
they could be much older, and it's just chance that they
found some very old, highly-weathered meteorites unrelated
to their "impact location". In such a case, is
there a dating method that could determine their true
terrestrial age?
Yes
Holbrooks are
pretty fresh, but they are in a semi-arid location, in sand
dunes which probably wick away moisture. Stones found in
the dunes are very fresh, while some in the flats are a lot
more rusty.
Anne brings up
a good point that diverse types can be found from one
event. I'm not saying that she agrees - odds are they
are planted. But I just want to keep an open mind and keep
asking questions.
Another
possibility is that one or two team members planted them and
kept other members in the dark. They may have documented
removal of the last couple found, thus adding more
"evidence" that they are legit. But while they
selected similar looking stones, they actually were
different types (?).
Anybody know some of these team members and if
they are qualified to do this sort of work/have good
reputations? Is this peer reviewed?
Odds are they are kooks or cheats. But maybe
they are on the up and up, but
simply have foolishly linked these "finds" to a
relatively recent fall(???).
It will be interesting to see what develops!
Mark Bowling
________________________________
From: Michael Farmer via Meteorite-list <meteorite-list at meteoritecentral.com>
To: Paul Gessler <cetuspa at shaw.ca>
Cc:
meteorite-list <meteorite-list at meteoritecentral.com>;
MEM <mstreman53 at yahoo.com>
Sent: Wednesday, October 15, 2014 5:13 PM
Subject: Re: [meteorite-list] Czech meteorite
fragments 20 years
Not to mention they are highly desert
varnished, something never seen in a wet place, and
different
types.
Whoever pulled this scam is pretty
foolish.
Michael Farmer
Michael Farmer
> On Oct 15, 2014, at 5:02 PM, Paul Gessler
via Meteorite-list <meteorite-list at meteoritecentral.com>
wrote:
>
> Looks like
something that was found sitting in a Moroccan sale bin for
the last 20 years.
> They look a lot
older than 20 years to me.
>
> Paul G
>
>
> -----Original
Message----- From: MEM via Meteorite-list
> Sent: Wednesday, October 15, 2014 4:53
PM
> To: Meteorite Mailing List
> Subject: [meteorite-list] Fw: [Geology2]
Meteorite fragments discovered 20years after bolide event in
Czech Republic
>
>
>
<www.sciencedaily.com/releases/2014/10/141014142736.htm>
>
> Meteorite fragments
discovered 20 years after bolide event in Czech Republic
>
Date: October 14, 2014
> Source:
Astronomy & Astrophysics
> Summary:
Scientists have discovered meteorite fragments 20 years
after the corresponding bolide
> was seen
in the skies of the Czech Republic. This discovery was made
possible by reanalyzing the trajectory, which moved the
impact line by 330 meters. Interestingly, the meteorites
found on the ground are of
> different
types, pointing to a parent asteroid of heterogeneous
composition.
>
>
>
>
________________________________
>
>
> First three Benešov
meteorites found in April 2011, with metal detectors. From
left to
> right: H5 chondrite of 1.56 g,
LL3.5 chondrite of 7.72 g with achondrite clast, and LL3.5
chondrite of 1.99 g [2].
> Credit: Image
courtesy of Astronomy & Astrophysics
>
>
> Astronomy & Astrophysics is publishing
the spectacular discovery of meteorite fragments 20 years
after the
corresponding bolide was seen in the skies of the Czech
> Republic. This discovery was made possible
by reanalyzing the
> trajectory, which
moved the impact line by 330 meters. Interestingly,
> the meteorites found on the ground are of
different types, pointing to a parent asteroid of
heterogeneous composition.
> Collisions
of meter-sized meteoroids with Earth's atmosphere are
> relatively rare, occurring about 40 times
a year. They cause very
> spectacular
events, known as superbolides. One of the best known such
> events, the Benešov bolide, occurred on 7
May 1991 at 23h 03m 46s UT
> over the
Czech Republic. It was recorded during systematic
photographic
> observations by the
European Fireball Network and certainly ended in a
> multiple meteorite fall, but no meteorite
was found in the weeks and
> years after
the fall, despite many attempts.
> In
February 2011, nearly 20 years
after the event, P. Spurný and his
>
colleagues [1] measured the records again and analyzed the
data with
> improved methods. This led to
a new picture of the whole event with a
>
revised atmospheric trajectory and a new impact location.
This allowed
> the team to recover the
Benešov meteorites, 20 years after the fall,
> exactly in the newly predicted area. It is
the first time a meteorite is found so long after the bolide
observation.
> The team found four small,
highly-weathered meteorites with a total
> mass of 12 g. The probability that these
four fragments come from
> different
meteoroids and were found by chance at the same place is
> estimated to be 1 in 100,000 or less. Even
more interestingly, these
> four
meteorites are of three different mineralogical types. This
means
> that the Benešov meteoroid was
heterogeneous and contained at least
>
three different types of
material. After the Almahata Sitta fall, this
> is the second time that such a
heterogeneous composition has been found. It raises the
possibility that a significant fraction of all asteroids
> are heterogeneous and that they were
strongly reprocessed by collisions
> with
other asteroids in the main belt.
>
________________________________
>
> Story Source:
> The
above story is based on materials provided by Astronomy
& Astrophysics. Note: Materials may be edited for
content and length.
>
________________________________
>
> Journal Reference:
>
1. Pavel Spurný, Jakub Haloda, Jiří Borovička, Lukáš
Shrbený, Patricie Halodová. Reanalysis of the Benešov
bolide and recovery of polymict breccia meteorites – old
mystery solved after 20 years. Astronomy & Astrophysics,
2014; 570: A39 DOI: 10.1051/0004-6361/201424308
> ________________________________
>
>
> Astronomy & Astrophysics.
"Meteorite fragments discovered 20 years after
> bolide event in Czech Republic."
ScienceDaily. ScienceDaily, 14 October
>
2014.
<www.sciencedaily.com/releases/2014/10/141014142736.htm>.
>
>
>
> .
>
> __,_._,___
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