[meteorite-list] Oriented chondrules?
From: mark ford <markf_at_meteoritecentral.com>
Date: Mon Mar 21 13:24:54 2005 Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B31244D8D_at_s-southern01.s-southern.com> Darren and list, I have seen Some pieces of NWA 869 that have similar oriented Chondrules, (even though some people have classified it as a 3.8), maybe its due to some sort of early impact deformation, otherwise you would you not expect the chondrules to be a lot more indistinct? ... Interesting thread this! Best, Mark Ford -----Original Message----- From: Graham Christensen [mailto:voltage_at_telus.net] Sent: Tuesday, March 08, 2005 8:31 AM To: Meteorite-list_at_meteoritecentral.com Subject: Re: [meteorite-list] Oriented chondrules? Hi Darren Chondritic meteorites come from asteroids that aren't quite large enough to have completely melted, but usually still large enough to cause some thermal alteration. The heat that was present might have made the chondrules sufficiently pliable that they squished into oval shapes due to the downward pressure from the material that was above it in its parent asteroid. Or, possibly the chondrules were already elongated but the pressure from above caused them to settle that way while the matrix was still soft. Just throwing out ideas, Graham ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Graham Christensen voltage_at_telus.net http://www.geocities.com/aerolitehunter msn messenger: majorvoltage_at_hotmail.com ----- Original Message ----- From: "Darren Garrison" <cynapse_at_charter.net> To: <meteorite-list_at_meteoritecentral.com> Sent: Monday, March 07, 2005 11:24 PM Subject: [meteorite-list] Oriented chondrules? (Sorry, last question of the night.) Anyone know anything about "oriented" chondrules in a meteorite? I was looking at the scan of that condrite that I had shown in the question about polishing (thanks to all who gave advise, by the way) and noticed that, for objects in the matrix that are oblong, the long axises of a large percentage of them seem to be aligned in a prefered direction rather than point in random directions. Here is the base image: http://webpages.charter.net/garrison6328/base_image.jpg And one with arrows added to a few of the larger objects. Many other chondrules seem to tend to be aligned in the same direction. http://webpages.charter.net/garrison6328/flow_direction.jpg ______________________________________________ Meteorite-list mailing list Meteorite-list_at_meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Meteorite-list mailing list Meteorite-list_at_meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list Received on Tue 08 Mar 2005 04:37:03 AM PST |
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