Re: [meteorite-list] Dino killer size
If you go to the following URL below, the 6th painting from The top is the K-T Event. Be sure to click on it to see a much Larger photo of it: http://michaelbloodmeteorites.com/JerryArmstrong.html Best wishes, Michael on 4/11/08 9:46 AM, E.P. Grondine at [EMAIL PROTECTED] wrote: Hi Sterling - I would imagine a lot of the cosmic osmium would have been sequestered in the impact spherules. The KT fossil meteorite seems to have been ignored by this group, so How would you determine the composition of what hit? First, take samples from around the crater. Then working from known densities and crater size, estimate your velocity. That said, the idea of using osmium ratios as a way of detecting impacts to have occurred looks valid. E.P. Grondine Man and Impact in the Americas __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list Life is short! Break the rules! Forgive quickly! Kiss slowly! Love truly, Laugh uncontrollably.. And never regret anything that made you smile. __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Dino Killer size
Hi Sterling, all - From the article: Another possibility is that the impacting objects were comets rather than asteroids, and contained much less osmium to begin with. But chemical traces of the impactors left behind in rocks and reported in previous studies suggest otherwise. The last I heard, the impactor was carbonaceous chondrite, i.l. comet, and K-T fossil meteorite showed that. Has this changed? E.P. Grondine Man and Impact in the Americas __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Dino Killer size
According to Cr and Mn isotopic analyses of KTB samples, the impactor was a carbonaceous chondrite - see report at: http://www.lpi.usra.edu/meetings/impact2000/pdf/3041.pdf Ted Bunch On 4/13/08 7:48 AM, E.P. Grondine [EMAIL PROTECTED] wrote: Hi Sterling, all - From the article: Another possibility is that the impacting objects were comets rather than asteroids, and contained much less osmium to begin with. But chemical traces of the impactors left behind in rocks and reported in previous studies suggest otherwise. The last I heard, the impactor was carbonaceous chondrite, i.l. comet, and K-T fossil meteorite showed that. Has this changed? E.P. Grondine Man and Impact in the Americas __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Dino Killer size
On Sun, 13 Apr 2008 09:32:33 -0700, you wrote: According to Cr and Mn isotopic analyses of KTB samples, the impactor was a carbonaceous chondrite - see report at: http://www.lpi.usra.edu/meetings/impact2000/pdf/3041.pdf Yes, but it appears that comets are essentially carbonaceous chondrites that formed far enough from the sun to not lose their volitile mineral ddihydrogen monoxide. So saying that it is a carbonaceous chondrite doesn't conclude if it iwas a wet one (called a comet) or a dry one (called an asteroid). __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Dino Killer size
Hi Ted, Darren, Listees, Thanks to Ted for the link of the first paper (should scientists now mind their pdf's or perish rather than call them papers) to use isotope (vs. elemental, i.e. Iridium) presence/ratios to show the proposed K/T impactor was a carbonaceous chondrite. As the authors show, it was done by confirming especially high chromium 54-Cr as well as a 53-Cr proportion compared with the terrestrial 52-Cr baseline, according to the pdf. Darren, I believe Ed asked if it was a carbonaceous chondrite and that is what Ted responded to, not whether it was wet or dry with water and other volatiles, which is another topic entirely. As to the comment that a dry carbonaceous chondrite is called an asteroid and a wet one, a comet, while that sounds nice and logical, I think it is a little misleading in common speech (just like his comment on dihydrogen monoxide which we all better know as water, so perhaps Darren is joking around). As we know best, the fate of many comets is fragmentation (and we've even seen impact), and this is nearly complete into little grains as far as we can tell in meteoroid streams. Rubble-Pile is a possibility after drying - but has this been proven? Other asteroids are called dormant comets under the impression that they are mostly inactive at their perihelia, though a change could revive them. I am not sure we ought to call something a comet that is half baked and has never errupted. For this reason neither Pluto nor Ceres are normally called comets. Hidalgo, I couldn't begin to guess... But he was a great man and also fine Mustang... Best wishes and Great Health, Doug On Sun, 13 Apr 2008 09:32:33 -0700, you wrote: According to Cr and Mn isotopic analyses of KTB samples, the impactor was a carbonaceous chondrite - see report at: http://www.lpi.usra.edu/meetings/impact2000/pdf/3041.pdf Yes, but it appears that comets are essentially carbonaceous chondrites that formed far enough from the sun to not lose their volitile mineral ddihydrogen monoxide. So saying that it is a carbonaceous chondrite doesn't conclude if it iwas a wet one (called a comet) or a dry one (called an asteroid -Original Message- From: Darren Garrison [EMAIL PROTECTED] To: meteorite-list@meteoritecentral.com Sent: Sun, 13 Apr 2008 12:51 pm Subject: Re: [meteorite-list] Dino Killer size On Sun, 13 Apr 2008 09:32:33 -0700, you wrote: According to Cr and Mn isotopic analyses of KTB samples, the impactor was a carbonaceous chondrite - see report at: http://www.lpi.usra.edu/meetings/impact2000/pdf/3041.pdf Yes, but it appears that comets are essentially carbonaceous chondrites that formed far enough from the sun to not lose their volitile mineral ddihydrogen monoxide. So saying that it is a carbonaceous chondrite doesn't conclude if it iwas a wet one (called a comet) or a dry one (called an asteroid). __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Dino killer size
Hi Sterling - I would imagine a lot of the cosmic osmium would have been sequestered in the impact spherules. The KT fossil meteorite seems to have been ignored by this group, so How would you determine the composition of what hit? First, take samples from around the crater. Then working from known densities and crater size, estimate your velocity. That said, the idea of using osmium ratios as a way of detecting impacts to have occurred looks valid. E.P. Grondine Man and Impact in the Americas __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Dino killer size
Hi, EP, List, I think the method will prove valuable. Tho I know little of the chemistry of osmium, they say that, once vaporized, it goes with the atmospheric moisture and is rained out and ends up in the muck. The iridium distribution is spotty and hard to find, but ocean (and lake) muck is widespread. Now that they've found the cosmic osmium where we expect it to be, I want'em to look for osmium-188 spikes (or enrichment) in some long sedimentary cores from geologically more recent times for evidence of impacts we are unaware of, or only suspect. Sterling K. Webb --- - Original Message - From: E.P. Grondine [EMAIL PROTECTED] To: meteorite-list@meteoritecentral.com Sent: Friday, April 11, 2008 11:46 AM Subject: [meteorite-list] Dino killer size Hi Sterling - I would imagine a lot of the cosmic osmium would have been sequestered in the impact spherules. The KT fossil meteorite seems to have been ignored by this group, so How would you determine the composition of what hit? First, take samples from around the crater. Then working from known densities and crater size, estimate your velocity. That said, the idea of using osmium ratios as a way of detecting impacts to have occurred looks valid. E.P. Grondine Man and Impact in the Americas __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Dino killer size
Hi Sterling Glaciologists would be the people to talk to. They do extensive varve sampling of current and paleo-glacial lakes looking for details they like. That would be a great place to start. Mark Ferguson - Original Message - From: Sterling K. Webb [EMAIL PROTECTED] To: E.P. Grondine [EMAIL PROTECTED]; meteorite-list@meteoritecentral.com Sent: Friday, April 11, 2008 5:08 PM Subject: Re: [meteorite-list] Dino killer size Hi, EP, List, I think the method will prove valuable. Tho I know little of the chemistry of osmium, they say that, once vaporized, it goes with the atmospheric moisture and is rained out and ends up in the muck. The iridium distribution is spotty and hard to find, but ocean (and lake) muck is widespread. Now that they've found the cosmic osmium where we expect it to be, I want'em to look for osmium-188 spikes (or enrichment) in some long sedimentary cores from geologically more recent times for evidence of impacts we are unaware of, or only suspect. Sterling K. Webb --- - Original Message - From: E.P. Grondine [EMAIL PROTECTED] To: meteorite-list@meteoritecentral.com Sent: Friday, April 11, 2008 11:46 AM Subject: [meteorite-list] Dino killer size Hi Sterling - I would imagine a lot of the cosmic osmium would have been sequestered in the impact spherules. The KT fossil meteorite seems to have been ignored by this group, so How would you determine the composition of what hit? First, take samples from around the crater. Then working from known densities and crater size, estimate your velocity. That said, the idea of using osmium ratios as a way of detecting impacts to have occurred looks valid. E.P. Grondine Man and Impact in the Americas __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
