RE: [meteorite-list] shock effect?
Frank wrote: Much of the ring structure appears to parallel the shape of the meteorite suggesting to me that weathering is responsible for the major part of what we are seeing, especially if, as I suspect, it was found on a now not so dry lake. Well, it is a lake bed find, but that parallel shape is a coincidence on this one face. The back side of that slice (2mm away) looks like this: http://www.home.earthlink.net/~jlp3/images/M0301-7.jpg And the end that I cut off for the type sample didn't show it at all. It seems to be a local phenomenon. Contributing to my suspicion that it is a shock effect are pre-terrestrial (fused by the fusion crust where they meet it) cracks concentrically arranged farther out from the dark area. But I've been wrong before! Jeff The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable priviledge. Please do not disseminate this message without the permisson of the author. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] shock effect?
Check out the concentric bands in this photo of my Nevada find First of all: Congrats on that exceptional find! http://www.home.earthlink.net/~jlp3/images/M0301-8.jpg Presumably a fossilized shockwave, written in darkened silicates That would also be my uneducated guess but I will go one step further: If this meteorite had had more time on its parent body, it would have become one of those incredible impact melts like Cat Mountain or other well-known impact melt breccias. Somehow the shock process may have been interrupted or stopped and the meteorite been ejected from its parent body before it underwent complete shock darkening: a shock melt breccia in the making ... ? Cheers, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] shock effect?
On Fri, 14 Jan 2005 17:10:40 -0500, Jeff Pringle [EMAIL PROTECTED] wrote: found posted at the BOTTOM of the message: The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Snicker. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] shock effect?
Hello Jeff, Looks like the growth rings of an asteroidal tree. Presumably a fossilized shockwave, written in darkened silicates - Do you think that's the right reason for this structure? Any other ideas? Shock may have contributed something to the rings, but I'd suggest that the main reason may be from terrestrial weathering. Much of the ring structure appears to parallel the shape of the meteorite suggesting to me that weathering is responsible for the major part of what we are seeing, especially if, as I suspect, it was found on a now not so dry lake. My two cents, Frank __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
