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Type 3 chondrites

Hello List,

Hewin's, et al, "Chondrules and the Protoplanetary Disk" is exceptional.  It is basically a volume of technical papers from a Lunar and Planetary Institute conference of the same name.  However, the editors did an exceptional job pushing the authors for well written papers with references and not the usual collection of brief abstracts.  This is a professionally-bound volume, not LPI's typical paperback.

Two of my favorite papers are by Wood and Boss respectively.  Wood poses all of the questions that must be answered in order for any chondrule formation model to be correct.  Boss does an excellent overview of all of the chondrule formation models, assessing their strengths and weaknesses (using much of the same reasoning as Wood).

I shopped around for this volume (still in print) and found the best price at Amazon.Com   It arrived within a week of placing my order (which is great for a science / technical volume).

While the price tag is stiff, there really is not another volume on chondrites, chondrules and chondrule formation models like it.  No meteoritephile's library should be without it.

Steve

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Steven Excell
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-----Original Message-----
From:	Martin Horejsi [SMTP:martinh@isu.edu]
Sent:	Monday, May 18, 1998 1:00 PM
To:	meteorite-list@meteoritecentral.com
Subject:	Type 3 chondrites


Hello All,

I'm wondering if anyone has read the book: Chondrules and the
Protoplanetary Disk by Roger H. Hewins, Rhian Jones, and Ed R.D. Scott?  It
was published in 1996.  Is this book one to get (even at $125)?

I have been spending some time looking at chondrules under magnification,
especially in LL3s.  In particular, one type 3 chondrite I have been
looking at is DaG 313 which Rolf offers at the SML. Compared to Ragland,
DaG 313  is quite similar, but occasionally it has some angular pieces of
different colored rock mixed in nicely with the circular chondrules. The
small rock inclusions have sharp corners and appear to be different from
broken chondrules.

Have the driving forces behind the accumulation of chondrules within a
meteorite's matrix been identified? What about the forces which formed the
chondrules in the first place?  Also, are chondrule-loaded specimens of
higher petrologic number such as Cole Creek and Baratta more like a
metamorphosed type 3, or was the chondrule accretion process in effect when
the meteorite was changing from a low number to a higher number?  In the
DaG 313, there are also regions of a different colored matrix material, but
the chondrule shape, size, and density seem unaffected except for a mild
darkening. I don't see this same situation in either Ragland, Sahara 97210,
or Wells among others.

I would like to hear thoughts on the matter of chondrule formation and
accumulation. If anyone is interested, I have a photograph I can send you
as an email attachment (132k jpeg) showing a clear example of an angular
rock inclusion among the chondrules.

Sincerely,

Martin