[meteorite-list] what is this, really

From: MexicoDoug <MexicoDoug_at_meteoritecentral.com>
Date: Sat Aug 26 02:41:15 2006
Message-ID: <00d701c6c813$bce07bc0$14cd5ec8_at_0019110394>

Hello Randy, List:

1. I just wanted to thank Dr. Korotev -- a long-established specialist in Lunar rocks from St. Louis, for the opportunity to hear his present and future comments on the list!

2. On the scale, does this mean the clasts get arbitrarily large for the known sample pool or is there a sort of maximum size assumed, my head is starting to hurt to imagine what sort of size distribution this could be. It couldn't be constant or you'd bump in to some very large pieces too frequently (??), but at the other extreme an inverse exponential wouldn't give you the robust size representations you are looking for in the asphalt, right, wrong, or... The 'fractal' thought suggests a pattern- is this just the "feel" of randomness at all reasonable lab scales or do you know if more can be read into this? If there really is a maximum size we can keep in mind for clasts, what would that be - over a variety of localities, and how much does this vary, I wonder. Any help would be kind, though the question is mostly curiosity, it could come in handy while hunting meteorites. And it is hard to reproduce this idea in a sandbox. The closest I can come is looking at a suspension like milk, under magnificati
on?

3. http://epsc.wustl.edu/admin/resources/moon/howdoweknow.html <== Everything you ever wanted to know is probably here on Lunar recognition, thanks to the excellent web site Randy maintains at Wash. U. St. Louis. (As in Missouri.)

Best wishes, Doug
  ----- Original Message -----
  From: Randy Korotev
  To: meteorite-list_at_meteoritecentral.com
  Sent: Thursday, August 24, 2006 12:26 PM
  Subject: Re: [meteorite-list] what is this, really


  1) In addition to not having a fusion crust, the object is suspiciously non-lunar in that the clasts are too much all the same size. Lunar regolith breccias are the closest lunar analogs to terrestrial sedimentary rocks, and there is often a superficial resemblance. In many (but not all) terrestrial sediments, however, wind and water processes lead to size sorting so that the clasts are all about the same size. There are no such sorting mechanisms on the Moon. I've called this a "fractal" effect - it doesn't make any difference what scale you look at a lunar regolith breccia, it always looks the same. To me, in the rock in the photo (asphalt?), there don't seem to be enough big clasts or small clasts, as, for example, in ALHA 81005:

  http://epsc.wustl.edu/admin/resources/meteorites/alha81005.html

  I've never heard of "meteorite expert" mentioned in the blurb.


  2) Regarding text of Pluto news release: "Although astronomers applauded after the vote, Jocelyn Bell Burnell -- a specialist in neutron stars from Northern Ireland ..."

  How many neutron stars are there in Northern Ireland?



  Randy Korotev



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