[meteorite-list] Primitive Achondrite Question

From: cdtucson at cox.net <cdtucson_at_meteoritecentral.com>
Date: Tue, 6 Dec 2011 16:07:58 -0500
Message-ID: <20111206160758.4AVII.249122.imail_at_fed1rmwml114>

Alan,
I agree with Darryl. Very fascinating conversation.
Speaking of tidy categories.
How do you feel about the following suggested case for replacing the current obsolete metallurgy system for classifying Iron meteorites? see link;

http://meteormetals.com/Case_for_New_Meteorite_Metallurgy.pdf

Cheers,
Carl
meteoritemax

---- Alan Rubin <aerubin at ucla.edu> wrote:
> Classifications are just a way of making sense of the world by putting
> diverse objects into tidy categories. Even though real-world objects don't
> always fit (is light a wave or a particle?), good classifications last
> longer than interpretations. For example, the Linnaeus classification
> system was developed from a creationist perspective but is used today by
> every evolutionary biologist. So, to answer your question, classification
> is an end in itself -- it certainly helps in understanding relationships
> among diverse objects. But classification is not the only end --
> understanding the origins of objects is also rather important, but because
> we have incomplete knowledge of objects, our interpretations are always
> tentative, subject to revision when new data are acquired. Classifications
> should be longer-lasting.
> As an aside, if you are interested in bad classification systems for
> meteorites, look at George Merrill's "The Story of Meteorites" from 1929:
> There are andrites, eukrites, shergottites, howardites, bustites,
> chassignites, chladnites, amphoterites, howarditic chondrites, white
> chondrites, intermediate chondrites, gray chondrites, black chondrites,
> spherulitic chondrites, crystalline chondrites, carbonaceous chondrites,
> orvinites, tadjerites, ureilites, lodranies, grahamite mesosiderites,
> siderophyrs, and more. Some of the groups are still recogniable, others
> less so. The problem was that the knowledge base at the time was
> insufficient to distinguish essential from secondary properties. Similar
> problems arose among classification schemes of living creatures and
> especially fossils.
>
> Alan
>
>
> Alan Rubin
> Institute of Geophysics and Planetary Physics
> University of California
> 3845 Slichter Hall
> 603 Charles Young Dr. E
> Los Angeles, CA 90095-1567
> phone: 310-825-3202
> e-mail: aerubin at ucla.edu
> website: http://cosmochemists.igpp.ucla.edu/Rubin.html
>
>
> ----- Original Message -----
> From: "MexicoDoug" <mexicodoug at aim.com>
> To: <raremeteorites at yahoo.com>; <meteorite-list at meteoritecentral.com>
> Sent: Tuesday, December 06, 2011 9:31 AM
> Subject: Re: [meteorite-list] Primitive Achondrite Question
>
>
> > Adam wrote:
> >
> > "NWA 3133 is a CV Primitive Achondrite"
> >
> > Hi Adam, thanks ... The asteroid belt ought to be called the asteroid zoo!
> >
> > The question I have on this one, if CV is for certain, would be whether it
> > is the result of a collision with a typical CV type, or is it certain that
> > it is a fully baked CV (what happened to the possible CAI's - are there
> > any, or is the CV possibly just impact regolith?), or, whether some
> > innocent CV got hot all by itself.
> >
> >
> > Kinest wishes
> > Doug
> >
> > (Why does my wallet retract down my pocket every time ths stuff comes up!)
> >
> >
> >
> >
> > -----Original Message-----
> > From: Adam Hupe <raremeteorites at yahoo.com>
> > To: Adam <meteorite-list at meteoritecentral.com>
> > Sent: Tue, Dec 6, 2011 11:47 am
> > Subject: Re: [meteorite-list] Primitive Achondrite Question
> >
> >
> > Doug wrote: I can't wait until someone turns up a CV6+. Theoretically,
> > there is
> > no reason to
> > bar the possibility,, or is there...
> >
> > NWA 3133 is a CV Primitive Achondrite
> >
> > All of these oxygen isotope compositions
> > plot on the CV3 mixing line, suggesting that this achondritic meteorite
> > has
> > affinities with CV chondrites (Irving et al., 2004).
> >
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Received on Tue 06 Dec 2011 04:07:58 PM PST