[meteorite-list] Nanodiamonds

From: Lance Wozniak <yumalan_at_meteoritecentral.com>
Date: Thu Apr 22 10:00:04 2004
Message-ID: <000701c22106$6f7d53c0$ecad3b41_at_hmtys>

Piper,

Thanks for the references and list, looks like I hit the jackpot. This
should keep me busy for a while with leisure reading.

Lance

----- Original Message -----
From: "Piper R.W. Hollier" <piper_at_xs4all.nl>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Sunday, June 30, 2002 2:16 PM
Subject: Re: [meteorite-list] Nanodiamonds


> Hello Lance, Bernd, and list,
>
> Nanodiamonds are found not just in carbonacous chondrites and enstatite
> chondrites, but also in ordinary chondrites of low metamorphic grade. See
> for example the article "Ubiquitous interstellar diamond and SiC in
> primitive chondrites - Abundances reflect metamorphism" by Gary R. Huss in
> Nature, vol. 347, Sept 13, 1990, pp. 159-162. An abstract is available
> online in the NASA ADS database:
>
> "It is shown here that interstellar diamond and SiC were incorporated into
> all groups of chondrite meteorites. Abundances rapidly go to zero with
> increasing metamorphic grade, suggesting that metamorphic destruction is
> responsible for the apparent absence of these grains in most chondrites.
In
> unmetamorphosed chondrites, abundances normalized to matrix content are
> similar for different classes. Diamond samples from chondrites of
different
> classes have remarkably similar noble-gas constants and isotropic
> compositions, although constituent diamonds may have come from many
> sources. SiC seems to be more diverse, partly because grains are large
> enough to measure individually, but average characteristics seem to be
> similar from meteorite to meteorite. These observations suggest that
> various classes of chondritic meteorites sample the same solar system-wide
> reservoir of interstellar grains."
>
> A more accessible article is "Presolar diamonds in Allende" by Tyrone L.
> Daulton, in Meteorite!, February 1999, pp. 26-29.
>
> For those who can stomach a rather technical treatment of the subject,
> there is a long (39 pages) two-part paper "Noble gases in presolar
> diamonds" by Gary R. Huss and Roy S. Lewis in Meteoritics 29 (1994) pp.
> 791-829. This paper is available online from the NASA ADS database:
>
> http://adsabs.harvard.edu/abstract_service.html
>
> Enter "presolar diamonds" as Title Words, choose Combine with: AND, and
> click Send Query. The list of results will include other relevant and more
> recent articles as well.
>
> In their introduction to their 1994 paper, Huss and Lewis say, "Presolar
> diamonds are relatively abundant in the most primitive members of all
> chondrite classes." Their study included these meteorites:
>
> Orgueil (CI)
> Semarkona (LL3.0)
> Bishunpur (LL3.1)
> Ragland (LL3.5)
> Mezo Madaras (L3.5)
> ALHA77214 (L3.5)
> Tieschitz (H3.6)
> Dimmitt (H3.8)
> Qingzhen (EH3)
> Indarch (EH3-4)
> Leoville (CV3)
> Vigarano (CV3)
> Allende (CV3)
> Kainsaz (CO3.2)
>
> Meteorites mentioned in more recent papers as sources of nanodiamonds
include:
>
> Axtell (CV3)
> Roosevelt County 075 (H3.2)
> Efremovka (CV3)
> Boriskino (CM)
> Kaidun (CR/CI polymict breccia)
>
> Don't be in a big rush to put your Allende slice under a microscope
looking
> for nanodiamonds. They are VERY tiny, as the "nano-" prefix suggests --
> each nanodiamond contains only a few thousand carbon atoms, with diameters
> ranging from 0.2 to 10 nanometers, and an average of about 2.8 nanometers.
> This means that one gram of Allende contains about 10 million billion
> nanodiamonds -- this figure from Tyrone Daulton's article.
>
> Best wishes to all,
>
> Piper
>
>
>
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Received on Mon 01 Jul 2002 09:51:41 AM PDT