Hi list, Nice shatter cones Mark...
Here is some photos of shatter cone boulders at Keurusselk� impact structure found last November. Unfortunately, they are not in my collection, since they are too big boulders: http://www.somerikko.net/impacts/keurusselka.html see also our Keurusselk� LPSC-abstract (made in hurry): http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1619.pdf Shatter cone photos can be seen also in my collection pages (click impactites): http://www.somerikko.net/old/geo/col/col.htm As for hint where to look at: I have shatter cones from: Beaverhead, Charlevoix, Dellen, Flynn Creek (weak), Gardnos, Glover Bluff, Kara, Karikkoselk�, Kentland, Keurusselk� (no photos yet), Lappaj�rvi, Marquez Dome, Middlesboro (weak), Paasselk�, Ries, Rochechouart, Rubielos de la C�rida, Saarij�rvi, Serpent Mound, Siljan, Steinheim, Sudbury, Suvasvesi structures, Suvasvesi S, S��ksj�rvi, Vredefort and Wells Creek. Jarmo Moilanen www.somerikko.net [EMAIL PROTECTED] MARK BOSTICK kirjoitti 20.02.2004 kello 03:57: > Hello List, > Shatter cones are one of my favorite types of meteorite impactite. Found > around large impact craters, called astroblemes (from Greek astron, > blema, > meaning "star wound"). Shatter cones have a distinctively patterned > structure that are formed in the rock by a large impacting object. Often > conically-shaped, these rocks have close-spaced "grooves" or "lines" > that > radiate outward from the apex. The apex, or point, of the stone points > towards the impact area. I've always thought of shatter cones as a sound > fossil. An Earth rock that has recorded the sound wave of the a large > object from outer space announcing its arrival to earth. > The following are photos showing most of the shatter cones in my > personal > collection. A couple I wanted to show were cut and you could see a > cross of > shatter cones in layers. Usually, you can break a shatter cone, and > create > two shatter cones. Some times something pretty, some times not. The > three > bottom photos show a shatter cone many of you might find of > interest. This > was found by Robert Szep, who told me he found it along the S.W. > portion of > Wanapitei Lake, about 30 yards from the shoreline. This was sold to > me as a > "double shatter cone", something that I have seen reported in several > books. According to Szep both ends, or apex were pointed in the correct > fashion for it to be a double shatter cone (each towards one of the > craters). However, I understand that sometimes, the sound-shock wave > from > the Sudbury impact, appeared to bounce in the target rock, leaving a > crinkle. The examples I have seen have been only in photos and are very > large, not on a small scale such as this specimen. The shatter cone > breaks > at almost a 90 degree angle. > Any impact cratering, physics or sound expert out there have any > opinion on > this rock? I have always felt sorry for the stone, hit by two > meteorites. > > Beaverhead Shatter cone. (Not large for the local, but for most > collections > it is). Almost perfect cone shape. > http://www.meteoritearticles.com/files/Beaverhead_Shattercone.jpg > http://www.meteoritearticles.com/files/Beaverhead_Shattercone_on_side.jpg > > Kentland Shatter cone > http://www.meteoritearticles.com/files/Kentland_Shattercone.jpg > > Rochochouart Shatter cone > http://www.meteoritearticles.com/files/Shattercone_Roch.jpg > > Sheinheim Shatter Cone. The second one is "cute". > http://www.meteoritearticles.com/files/Steinheim_Shattercone.jpg > http://www.meteoritearticles.com/files/Steinheim_Shattercone_nice.jpg > > Wells Creek Shatter Cones > First photo is positive side, second is negative side > http://www.meteoritearticles.com/files/Shattercone_Wellcreek_1.jpg > http://www.meteoritearticles.com/files/Shattercone_Wellcreek_b.jpg > Shattercone with nice "horsetailing", second photo is closeup > http://www.meteoritearticles.com/files/wells_Creek_Shattercone.jpg > http://www.meteoritearticles.com/files/Wells_Creek_Shattercone_foxtailingjpg > > > Serpent Mound Shatter Cones > http://www.meteoritearticles.com/files/Sijin_Shattercone.jpg > > Siljan Shatter cone > http://www.meteoritearticles.com/files/Serphant_Monnd_Shattercone.jpg > > Sudbury Shatter cones > 3.5 kilogram Sudbury Shatter cone. > http://www.meteoritearticles.com/files/Sudbury_Shattercone_3.5kg_side.jpg > http://www.meteoritearticles.com/files/Sudbury_Shattercone_3.5kg.jpg > > Large flat Sudbury Shatter cone. > http://www.meteoritearticles.com/files/Sudbury_flat_shattercone_side_1.jpg > http://www.meteoritearticles.com/files/Sudbury_flat_shattercone_side2.jpg > > A Sudbury and Winnipeg double shatter cone. > http://www.meteoritearticles.com/files/Sudbury_Winnipeg_Shattercone.jpg > http://www.meteoritearticles.com/files/Sudbury_Winnipeg_Shattercone_Side_1.j > pg > http://www.meteoritearticles.com/files/Sudbury_Winnipeg_Shattercone_Side_1.j > pg > > > > Please visit, www.MeteoriteArticles.com, a free on-line archive of > meteor > and meteorite articles. .............................................................. MTV3 Laajakaista - Hauskemman el�m�n puolesta. http://www.mtv3.fi/liittyma/hankinta/laajakaista/ ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
