Bob, List,
Ok, Franconia is very convoluted. (What a great place!)
Time to have a few of my (L) finds from there classified. It's so
confusing, now I have no idea what any of my meteorites from the area
are! I'd like to see a visual aid, side by side, the various stones
sliced and labeled with classifications.
Sincerely,
Larry Atkins
IMCA # 1941
Ebay alienrockfarm
-----Original Message-----
From: Robert Verish <[email protected]>
To: Meteorite-list Meteoritecentral
<[email protected]>
Sent: Mon, Apr 29, 2013 1:57 am
Subject: Re: [meteorite-list] Franconia AREA (was, Re:
...terminology...)
In my original post I neglected to add a link to the Hutson paper.
Here is the link to the "News" page from the Met. Bull. Database:
http://www.lpi.usra.edu/meteor/MetBullNews.php?id=1
On that MetBull webpage is a link to the Melinda Hutson paper:
http://onlinelibrary.wiley.com/doi/10.1111/maps.12062/abstract
It was my hope that my post would draw some interest and get more
people to read
this recent M&PS article. (2013 March, Vol.48 No.3 pg.365)
The thrust of my (partial) review was that many long-held assumptions
about the
Franconia area have been overturned by this paper. Actually, a better
phrase
would be, "many sacred-cows have been slaughtered".
My post was a plea that if you were going to put in print some
observation about
the Franconia Area, you had better read this paper first.
I am in agreement with what is at the heart of Erik's post, so I don't
want his
point missed because of a technicality with his reference to the Gold
Basin
Fall. I consider myself as a student of that strewn-field and,
although there
are many different meteorites found in the Gold Basin AREA, nowhere in
the
literature has anything other than L4-6 Fa:24±1 been attributed to the
Gold
Basin fall.
Prior to reading this recent paper, I was in complete agreement with
Larry about
the relative terrestrial age of the L-chondrites, particularly the
"fresh-appearing" BM002 & BM003 stones. But that was just another
cow-shaped
assumption. Terrestrial age-dating for 10 stones from the Franconia
Area were
presented in this paper, and aside from the lone H6 stone (BM001) all
of the
L-chondrites dated older than the H-falls.
Here is the relative order of falls:
1. BM 001 ~20kyr ago
2. BM 003 ~11kyr ago
3. Palo Verde Mine ~10kyr ago
4. BM 004 ~ 8kyr ago
5. BM 005 ~ 7kyr ago
6. BMW 4.0±0.7kyr ago
7. Franconia "fell recently"
Looking forward to hearing from others who have read this article.
Have a good night,
Bob V.
General List Policies:
6. Make sure you can back up statements with -facts and references-
--- On Sun, 4/28/13, Mark <[email protected]> wrote:
From: Mark <[email protected]>
Subject: Re: [meteorite-list] Franconia AREA (was, Re:
...terminology...)
To: "Larry Atkins" <[email protected]>
Cc: "[email protected]"
<[email protected]>
Date: Sunday, April 28, 2013, 5:15 PM
I agree with Eric too,
but not for the different dates that Larry refers to
(which is mentioned in the same article).
After seeing many diverse rock types in a same small rock mass,
I've always felt it's too simplistic to say
different class. = different fall.
I would go with the dating in this specific case that
indicates different fall events though.
Sent from my iPod Touch
On Apr 28, 2013, at 4:44 PM, Larry Atkins <[email protected]>
wrote:
> Eric,
>
> Though I'm not in total agreement with you,
> that is a good point.
> What it comes down to is terrestrial age.
> That would settle it.
> For instance, the L chondrites at Franconia are
> quite obviously from a more recent event,
> I'm certain they are not related.,
> they are distinctly different in hand
> and look fresher, and far rarer..
>
> Almahitta - Sita, among others, says they are not
always homogeneous. You make good points
>
> Sincerely,
> Larry Atkins
>
> IMCA # 1941
> Ebay alienrockfarm
>
>
> -----Original Message-----
> From: Erik Fisler <[email protected]>
> To: Meteorite List <[email protected]>
> Sent: Sun, Apr 28, 2013 7:11 pm
> Subject: Re: [meteorite-list] Franconia AREA (was, Re:
...terminology...)
>
>
> You mean all those H3-5's are paired?!? Lord.
>
> I think people forget that there are LL's, L's and H's
> found from the Gold Basin fall.
> To say that a mass from a parent body large
> enough to have a strewn field
> of this size and TKW should be one homogeneous
> petro.-type is silly.
> This business of trying to classify every stone as a
> different fall for what
> ever selfish or perverse reason along with having a
> personal attachment to the
> outcome of the over all conclusion is ridiculous and
> completely against the
> scientific method.
>
> How many of those Y[ucca]DCA or what ever H3-5's have been
> found outside the mapped strewn field? And how far?
>
> -Erik Fisler
>
> Sent from my iPhone
>
> On Apr 26, 2013, at 11:02 PM, Robert Verish <[email protected]>
wrote:
>
>> Hi All,
>> Just read another article in the 2013 March edition
of M&PS,
>> "Stones from Mohave County, Arizona:
>> Multiple falls in the 'Franconia strewn field' "
>> by Melinda Hutson, et al.
>>
>> There is much to digest from this 5-author paper
>> that is 25 pages long.
>> What with 14 stones being studied and 7 pairings to
>> be described, there is a lot to chew on.
>>
>> Here's something to chew on. According to this paper,
>> "Much unclassified
>> material that has been distributed [sold] as
>> 'Franconia' may not be from the Franconia fall".
>> The authors make a case that
>> more than half of the finds made in the "Franconia area"
>> are paired to the Buck Mountain Wash fall.
>>
>> It has taken 10 years, but these findings show that
>> I was justified in my belly-aching about all of the
>> self-pairing that was occurring back then.
>> It was on this very List that I was strongly criticized
>> for this, and many dealers that thought they knew better
>> defended their God-given right to name their stones
>> after the Franconia meteorite that I got classified.
>>
>> A closer look at the MetBull images for Franconia shows
>> that very few of them are from the Franconia fall.
>> I offer no apologies for taking great satisfaction
>> in the fact that I am now vindicated.
>>
>> The paper goes on to show that every Sacramento Wash
>> numbered meteorite is paired to Buck Mountain Wash,
>> which effectively has resulted in the demise of
>> the SaW DCA and hastened the formation of the Yucca DCA.
>>
>> As I said, if you read this paper, there's a lot
>> more to digest.
>> It's late and I'm thinking about chewing on an antacid pill.
>>
>> -- Bob V.
>>
>> --- On Thu, 4/25/13, Jim Wooddell <[email protected]>
wrote:
>>
>>> From: Jim Wooddell <[email protected]>
>>> Subject: Re: [meteorite-list] Chelyabinsk - IMB
or SMB? The
> nomenclature of
> Melts.
>>> To: "Meteorite List" <[email protected]>
>>> Date: Thursday, April 25, 2013, 5:29 PM
>>> Hi All!
>>> Just a point of information. I just read
Dr. Rubin's paper,
>>> "Multiple melting in a four-layered
barred-olivine chondrule with
>>> compositionally heterogeneous glass from LL3.0
Semarkona"
>>> Whew! That's a title for a paper!
>>> While we are on the subject of melts, I thought
I'd point-out
>>> this paper.
>>> Enjoyed reading it the first time....actually
understood some
>>> of it and will read it once again after
thinking about it
>>> for a while.
>>> You folks might enjoy reading it when you get a
chance!
>>> Thanks Alan!!
>>>
>>> Jim Wooddell
>> ++++++++++++++
>>
>> ______________________________________________
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