[meteorite-list] vast geoablation in Argentina, craters from SW to NE -- Cox re Boslough bursts: Rich Murray 2011.07.31
vast geoablation in Argentina, craters from SW to NE -- Cox re Boslough bursts: Rich Murray 2011.07.31 http://rmforall.blogspot.com/2011_07_01_archive.htm Sunday, July 31, 2011 [ at end of each long page, click on Older Posts ] http://groups.yahoo.com/group/astrodeep/message/91 [ you may have to Copy and Paste URLs into your browser ] http://www.bibliotecapleyades.net/ciencia/ciencia_asteroids_comets27.htm Something Wicked This Way Comes Meteor A New Kind of Catastrophe by Dennis Cox 09 April 2011 from SOTT Website "...At Sandia Labs, Mark Boslough used their 'Red Storm' supercomputer to simulate the airburst and impact of a 120-meter diameter stony asteroid. [ http://www.space.com/2295-supercomputer-takes-cosmic-threat.html ] The colors in the simulation we see in the below video, are graded by temperature. White = 5800°K - 5527°C Red = 2000°K - 1727°C http://www.youtube.com/watch?v=Gr7i33UhmC8&feature=player_embedded Simulation of an asteroid exploding in Earth's atmosphere, taking into account the momentum. [ 21 second video ] Dr Boslough tells us that, in it, we see the ablated meteoritic vapor mixes with the atmosphere to form an opaque fireball with a temperature of thousands of degrees. As it hits the ground, the hot vapor cloud expands to a diameter of 10 km within seconds, remaining in contact with the surface, with velocities of several 100m/s. And at temperatures exceeding the melting temperature of quartz for more than 20 seconds. Moreover, the air speed behind the blast wave exceeds several hundred meters per second during this time. For comparison, an ordinary oxy-acetylene cutting torch in a steel shop uses a thin stream of hot gases at only about 900°C. and 40 psi to cut steel. The speed of that stream of hot gasses is only a little bit more than a stiff breeze. But that's all it takes to turn solid iron into a melted, aerosol, spray. And to blow it away in runnels of melt into heaps of slag. Dr Boslough tells us that: "Simulations suggest strong coupling of thermal radiation to the ground, and efficient ablation of the resulting melt by the high-velocity shear flow." We have its existence predicted in peer reviewed literature. But so far I haven't heard anyone attempt to describe the form that such geo-ablative melt might take as it is emplaced. While in motion, any ablated materials from a large, geo-ablative, airburst like that would be in atmospheric suspension, in a density current similar to a pyroclastic flow. And when everything comes to rest, the resulting rock form might be visually indistinguishable from ordinary volcanic tuff, or ignimbrite. If so, we face a conundrum in the Earth sciences. Because it has always been assumed without question that only terrestrial volcanism can melt the rocks of the Earth, or produce 'Tuff'. If very large airbursts can produce formations of geo-ablative melt, instead of craters, then almost every last pebble of airburst melt on this fair world of ours has been mis-defined as volcanogenic. Astronomers Victor Clube, and William Napier, had been talking about the giant comet they described as the progenitor of the Taurid Complex since 1982, in their book The Cosmic Serpent. But no one had connected the dots, and put the Younger Dryas comet, and the Taurid Progenitor together. Except in private, speculative, emails, and letters. And to the best of my knowledge there was nothing in refereed literature. http://dl.dropbox.com/u/2268163/Paleolithic%20extinctions.pdf 7 page Then, in early 2010 Professor Napier published a paper in the Journal Monthly Notices of the Royal Astronomical Society titled, "Paleolithic extinctions and the Taurid Complex," -- in it we read: "The proposition that an exceptionally large comet has been undergoing disintegration in the inner planetary system goes back over 40 years (Whipple 1967), and the evidence for the hypothesis has accumulated to the point where it seems compelling. Radio and visual meteor data show that the zodiacal cloud is dominated by a broad stream of largely cometary material which incorporates an ancient, dispersed system of related meteor streams. Embedded within this system are significant numbers of large NEOs, including Comet Encke. Replenishment of the zodiacal cloud is sporadic, with the current cloud being substantially over-massive in relation to current sources. The system is most easily understood as due to the injection and continuing disintegration of a comet 50-100 km in diameter. The fragmentation of comets is now recognized as a major route of their disintegration, and this is consistent with the numerous sub-streams and co-moving observed in the Taurid complex. The probable epoch of injection of this large comet, ~20-30 kyr ago, comfortably straddles the 12.9 kyr date of the Younger Dryas Boundary. The hypothesis that terrestrial catastrophes may happen on timescales ~0.1 Myr, due to the Earth running through swarms of debris from disintegrating large c
Re: [meteorite-list] vast geoablation in Argentina, craters from SW to NE -- Cox re Boslough bursts: Rich Murray 2011.07.31
While no one is going to address all of these points from this long post, I'll tackle one --- the Libyan Desert Glass: Low Altitude Airburst... from a ~100 meter diameter NEO melted sand into glass across a region about 10 km in diameter during Libyan Desert Glass impact... 35 million years ago. The problem is that when walks the incredible inferno of this part of the Sahara and its vast sands, one thinks: how could this sand have been fused in glass? And that is a DEAD WRONG question. 35 to 28 million years ago this area, and tens of thousands of square miles around it, were UNDERWATER. These low desert basins were a lacrustine environment -- shallow waters, with an occasional patch of swampy ground (on what are now hilltops). When I say "shallow," I mean 100 meters more or less. Underlying the LDG area is sandstone, the upper layers of which is younger than the LDG, sandstone that formed at those lake bottoms. The LDG is found along the former shoreline in one area of the SW shore of the Depression. There's a nice Google map of those lacrustine basins at: http://www.inognidove.it/egypt/ If the LDG formed from dry desert sand by incredible heat from an airburst or an impact, it had to have happened somewhere else and the LDG was moved here, or they are yellow tektites from the same event as other tektites their age or another event of similar age elsewhere. If the Belize tektites are "australites" in age, they were tossed a long way. The LDG could have been tossed from Chesapeake Bay, which BTW was a lot closer to Egypt in the Oligocene than it is now, as the Atlantic was narrower, not that great distances matter much to tektites. I would give a bunch of references, but since I've posted about this twice over the last ten years and put lots of citations in them, just check the List Archives if you want references. Here's one, though. "The 1981 expedition... established that the present mass of glass exceeds 14,000,000 tons; the original mass of glass may have been 10,000 times greater, or 140,000,000,000 tons." [units converted] http://www.sciencedirect.com/science/article/pii/0022309384901777 140 billion tons of glass is one heck of a lot of glass for one little 100-meter NEO to whip up a batch of. Let's see. First you have to boil 10-100 meters of water off, then dry out the wet bottoms and all the sand, then you have to melt 140,000,000,000 tons of it. I think you need a bigger bang... even to toss it there. Sterling K. Webb - Original Message - From: "Rich Murray" To: ; "Rich Murray" ; "Rich Murray" Sent: Sunday, July 31, 2011 2:11 PM Subject: [meteorite-list] vast geoablation in Argentina, craters from SW to NE -- Cox re Boslough bursts: Rich Murray 2011.07.31 vast geoablation in Argentina, craters from SW to NE -- Cox re Boslough bursts: Rich Murray 2011.07.31 http://rmforall.blogspot.com/2011_07_01_archive.htm Sunday, July 31, 2011 [ at end of each long page, click on Older Posts ] http://groups.yahoo.com/group/astrodeep/message/91 [ you may have to Copy and Paste URLs into your browser ] http://www.bibliotecapleyades.net/ciencia/ciencia_asteroids_comets27.htm Something Wicked This Way Comes Meteor A New Kind of Catastrophe by Dennis Cox 09 April 2011 from SOTT Website "...At Sandia Labs, Mark Boslough used their 'Red Storm' supercomputer to simulate the airburst and impact of a 120-meter diameter stony asteroid. [ http://www.space.com/2295-supercomputer-takes-cosmic-threat.html ] The colors in the simulation we see in the below video, are graded by temperature. White = 5800°K - 5527°C Red = 2000°K - 1727°C http://www.youtube.com/watch?v=Gr7i33UhmC8&feature=player_embedded Simulation of an asteroid exploding in Earth's atmosphere, taking into account the momentum. [ 21 second video ] Dr Boslough tells us that, in it, we see the ablated meteoritic vapor mixes with the atmosphere to form an opaque fireball with a temperature of thousands of degrees. As it hits the ground, the hot vapor cloud expands to a diameter of 10 km within seconds, remaining in contact with the surface, with velocities of several 100m/s. And at temperatures exceeding the melting temperature of quartz for more than 20 seconds. Moreover, the air speed behind the blast wave exceeds several hundred meters per second during this time. For comparison, an ordinary oxy-acetylene cutting torch in a steel shop uses a thin stream of hot gases at only about 900°C. and 40 psi to cut steel. The speed of that stream of hot gasses is only a little bit more than a stiff breeze. But that's all it takes to turn solid iron into a melted, aerosol, spray. And to blow it away in runnels of melt into heaps of slag. Dr Boslough tells us that: "Simulations suggest strong coupling of thermal radiati
