Hi Jim, Shawn, all
We had last Saturday in Ensisheim (meteorite show) a nice talk about
the Dawn mission. It was entitled:
"Vesta,Vestoids and HEDS: Waiting for Dawn."
It dealt with various issues, among which relationships between HED's
and Vesta, but also (and mainly) other Vestoids.
Perhaps you may want to contact our speaker, Vishnu Reddy (PhD &
research faculty at the Department of Space Studies, University of
North Dakota, presently member of the Dawn Framing Camera team at the
Max-Planck Institute for Solar System Research, Germany).
His research interests include compositional study of asteroids and
asteroid-meteorite links, and, in particular, studying the composition
of the surface of Vesta.
Vishnu is the (very kind end expertized) person who might want to tell
you more.
I can provide his direct mail contact on request, off list.
For general info on the Dawn mission and Vishnu's involvements, click
here and follow the links:
http://www.dawn.mps.mpg.de/index.php?id=21&L=1
Kind regards,
Zelimir
Jim Wooddell <[email protected]> a écrit :
Thank you for this, Shawn. My references were from the work Rose did
in the 1860's and forward. I think the current schema follows this
somewhat as Weisberg points out.
I think maybe not enough is known to classify at the higher division
levels, thus the disagreements and the lack of unity at these levels
and unwillingness to change??? It appears at lower levels, documents
all around tend to speak the same language and have commonality. In
part of my working life, commonality and correct terminology could
have meant the difference between life and death in a matter of a few
seconds....which has made me very critical when I do not see it.
Classification must remain fluid and not get stuck on the journey.
The work on the IAB-complex meteorites, it's groups and grouplets,
etc., for example, need to be represented in new systematic diagrams
that I have yet to see in any documentation, not that I've read them
all, I am sure. I'd sure love to see one I could hang on my wall! I
find this sort of diagram a value added asset while I study
meteorites.
I hope Dawn is the being of a new era in classification. And it is
becoming to be very exciting to watch what happens as Dawn approaches!
Simply awesome.
Wouldn't it be nice to land, drill and retrieve a deep core sample!
Back to honey-do's
Kind Regards,
Jim Wooddell
On Tue, Jun 21, 2011 at 1:22 AM, Shawn Alan <[email protected]> wrote:
Hello Jim and Listers
While we are on the topic of meteorite classification here is some
historical information about classification of meteorites.
De Drée, 1803: The First Meteorite Classification
De Drée took a great interest in meteorites and
immediately began to work out a classification of them based
chiefly on their materials, as reported by Howard and
Vauquelin, and the circumstances of their falls. He
distinguished the following four classes (de Drée 1803b:410):
Class I: Stones consisting of similar materials that fell in
serene weather without thunderstorms: Salles, Ensisheim,
Barbotan, Benares, Wold Cottage.
Class II: Stones of the same materials as class I but which
fell from enflamed clouds with lightning flashes with or
without detonations: Siena, Tabor.
Class III: Masses mainly of malleable iron, of which the
only observed fall occurred at Agram in Croatia after a
fireball and an explosion followed by rumbling sounds.
Class IV: All masses for which the circumstances of fall
are not verified and their compositions fall outside those of
the first three classes or are uncertain: his list of about 20
included the irons found in Siberia, Argentina, and Senegal;
stones from observed falls including Lucé, Eichstädt, and
Portugal, and about a dozen historical accounts taken mainly
from Chladni.
De Drée’s attempt illustrates the importance given at that
early time to the circumstances of falls as though they might
have genetic significance. It also shows the immensity of the
labors that lay ahead in efforts to understand meteorites and
construct meaningful classifications of them.
Source: Ernst Florens Friedrich Chladni (1756–1827) and the origins
of modern meteorite research by Ursula B. MARVIN
I wondering if the Dawn project will shed new light on
classification of meteorites from Vesta or in general?
Shawn Alan
IMCA 1633
eBaystore
http://shop.ebay.com/photophlow/m.html
[meteorite-list] Currently used classification scheme -
DivisionsJim Wooddell jimwooddell at gmail.com
Mon Jun 20 20:39:50 EDT 2011
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Hi all,
I am looking for some information in regards to the Division of
Meteorites in the currently used classification scheme.
It is my understanding that there are currently 3 divisions that all
meteorites fall under....or at least at one time there were three.
Chondrites, Primitive Achondrites and Achondrites.
1. Referencing Weisberg et al: Systematics and Evaluation of
Meteorite Classification, has there been any divisions added since
this document was printed? Are there still only 3 divisions?
2. Is there a more up to date schema or diagram which supersedes the
document above? I know there are changes in the IAB complex groups
and grouplets, referencing a document by Wasson accepted in 2002, are
there other changes?
Thank you for any info on this.
Kind Regards
Jim Wooddell
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