[meteorite-list] CV metachondrite pairings

[David Weir]

Adam Hupe wrote:

> By the way, It has been cleared with both Dr. Irving and Dr. Bunch for you
> to contact them in regards to previous statements you made that are in
> error.

Yesterday I had a conversation with Ted Bunch as you suggested, and he 
will inform webmaster Wittke of the incorrect statement on the NAU 
website that expresses a pairing of NWA 3133 with NWA 1839. From the 
maintainence of my website, which contains almost a quarter of a million 
words that change regularly according to ongoing research results, I can 
empathize with his and Dr. Wittke's efforts to keep an up-to-date 
website and also do his teaching, research, and publishing, not to 
mention maintaining a family life. I am most grateful for their 
excellent website.

http://www4.nau.edu/microanalysis/Microprobe/Probe.html

In a prior post I stated that I thought the probabilities would be 
vanishingly small (although not zero) to find two unpaired, CV 
metachondrites, with overlapping mineralogy and chemistry, at the same 
proximity and time. Apparently I should buy a lottery ticket. These two 
meteorites have taken convoluted classification paths, both originally 
"listed" as L7 according to Ted, then NWA 3133 was determined to be a CV 
metachondrite and was eventually classified as an ungrouped primitive 
achondrite. I suspect it will eventually be reclassified as CV 
metachondrite consistent with what is presented on the NAU website. NWA 
1839 never made the official transition from L7 to ungrouped PAC, but it 
too will probably eventually get a CV metachondrite label as it is 
presently recognized on the NAU website.

Ted said that these two CV metachondrites have different O-isotope plots 
along the CV mixing line and thus are not paired. I have updated my 
website where necessary. So now the big pairing mystery seems to be 
cleared up, and we have TWO new CV metachondrites to expand our 
knowledge base. Nice!

Now I would like to take this opportunity to acknowledge my gratitude 
and friendship to Aziz Habibi for gifting me almost a gram of 
NWA011/2400 (that's 1000 x what I have!), which will now become the 
official representative specimen of this probably extinct asteroid on my 
website. Many thanks Aziz!

David