Re: [meteorite-list] Show me the Shock
It would have a cosmic-ray exposure age of 4.4 billion years. No iron meteorite has a CRE age anywhere near that. On Tue, Jul 25, 2023, 1:32 PM Alfredo Petrov via Meteorite-list < meteorite-list@meteoritecentral.com> wrote: > There could be pieces of iron from Earth's core floating around the solar > system, left over from the collision that created the Moon. Since we have > no direct chemical analyses of Earth core material, when an iron meteorite > falls, how would we know whether it was originally Earth material or not? > > On Tue, 25 Jul 2023 at 20:57, Robert Verish via Meteorite-list < > meteorite-list@meteoritecentral.com> wrote: > >> https://www.space.com/boomerang-meteorite-left-earth-and-returned >> >> A dark reddish-brown stone, picked up from the Sahara desert in Morocco a >> few years ago, appears to be an Earth rock that was flung into space >> where >> it stayed for thousands of years before returning home ? surprisingly >> intact. >> >> If scientists are right about this, the rock will officially be named the >> first meteorite to boomerang from Earth. [Not for certain!] >> >> The discovery team's work was *presented* >> ( >> https://conf.goldschmidt.info/goldschmidt/2023/meetingapp.cgi/Paper/20218 >> ) >> last week at an international geochemistry conference and has not yet been >> published in a peer-reviewed journal. >> >> "I think there is no doubt that this is a meteorite," said Frank Brenker, >> a >> geologist at the Goethe University Frankfurt in Germany, who was not >> involved with the new study. "It is just a matter of debate if it is >> really >> from Earth." [But, still could be the other way around.] >> >> Early diagnostic tests show the unusual stone features the same chemical >> composition as volcanic rocks on Earth. Interestingly, however, a few of >> its elements seem to have been altered into lighter forms of themselves. >> These lighter versions are known to occur only upon interacting with >> energetic *cosmic rays* ( https://www.space.com/32644-cosmic-rays.html ) >> in space, which provided one of two key pieces of evidence >> declaring the rock's trip beyond Earth, geologists say. >> >> Other pending measurements include unambiguous data about how much shock >> from the original impact the stone absorbed. This unique signature can be >> detected >> in the permanently altered microstructures of the mineral crystals >> forming the rock. >> Estimating the meteorite's shock levels is "something that can be checked >> or done >> in one hour or so max, using naked eyes," Ferrière said, "thus, not >> costly and a >> very important observation in this case." >> >> ( https://cdn.mos.cms.futurecdn.net/uh7CnCZNh4MNnFY78yR2ke.jpg ) >> __ >> Meteorite-list mailing list >> Meteorite-list@meteoritecentral.com >> https://pairlist2.pair.net/mailman/listinfo/meteorite-list >> > __ > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > https://pairlist2.pair.net/mailman/listinfo/meteorite-list > __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist2.pair.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Show me the Shock
There could be pieces of iron from Earth's core floating around the solar system, left over from the collision that created the Moon. Since we have no direct chemical analyses of Earth core material, when an iron meteorite falls, how would we know whether it was originally Earth material or not? On Tue, 25 Jul 2023 at 20:57, Robert Verish via Meteorite-list < meteorite-list@meteoritecentral.com> wrote: > https://www.space.com/boomerang-meteorite-left-earth-and-returned > > A dark reddish-brown stone, picked up from the Sahara desert in Morocco a > few years ago, appears to be an Earth rock that was flung into space where > it stayed for thousands of years before returning home ? surprisingly > intact. > > If scientists are right about this, the rock will officially be named the > first meteorite to boomerang from Earth. [Not for certain!] > > The discovery team's work was *presented* > ( > https://conf.goldschmidt.info/goldschmidt/2023/meetingapp.cgi/Paper/20218 > ) > last week at an international geochemistry conference and has not yet been > published in a peer-reviewed journal. > > "I think there is no doubt that this is a meteorite," said Frank Brenker, a > geologist at the Goethe University Frankfurt in Germany, who was not > involved with the new study. "It is just a matter of debate if it is > really > from Earth." [But, still could be the other way around.] > > Early diagnostic tests show the unusual stone features the same chemical > composition as volcanic rocks on Earth. Interestingly, however, a few of > its elements seem to have been altered into lighter forms of themselves. > These lighter versions are known to occur only upon interacting with > energetic *cosmic rays* ( https://www.space.com/32644-cosmic-rays.html ) > in space, which provided one of two key pieces of evidence > declaring the rock's trip beyond Earth, geologists say. > > Other pending measurements include unambiguous data about how much shock > from the original impact the stone absorbed. This unique signature can be > detected > in the permanently altered microstructures of the mineral crystals forming > the rock. > Estimating the meteorite's shock levels is "something that can be checked > or done > in one hour or so max, using naked eyes," Ferrière said, "thus, not costly > and a > very important observation in this case." > > ( https://cdn.mos.cms.futurecdn.net/uh7CnCZNh4MNnFY78yR2ke.jpg ) > __ > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > https://pairlist2.pair.net/mailman/listinfo/meteorite-list > __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist2.pair.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Show me the Shock
I am really surprised that a press release was issued on work that has not even been submitted for peer-reviewed publication. There seems to be no age data, no bulk chemical data, and no shock data. The authors seem to claim it was launched off Earth just 10,000 years ago, but I don't know where this comes from. Of course, there is no large terrestrial crater of that age. If the crystallization age is 4.5 billion years, then it is not from Earth. If the rock was launched from Earth, the required energy would melt it. The rock is listed as an achondrite, so that part fits, but it would have melted during launch 10,000 years ago (if that number is valid), not billions of years ago. I remain skeptical and surprised at the precipitous press release. On Tue, Jul 25, 2023, 11:58 AM Robert Verish via Meteorite-list < meteorite-list@meteoritecentral.com> wrote: > https://www.space.com/boomerang-meteorite-left-earth-and-returned > > A dark reddish-brown stone, picked up from the Sahara desert in Morocco a > few years ago, appears to be an Earth rock that was flung into space where > it stayed for thousands of years before returning home ? surprisingly > intact. > > If scientists are right about this, the rock will officially be named the > first meteorite to boomerang from Earth. [Not for certain!] > > The discovery team's work was *presented* > ( > https://conf.goldschmidt.info/goldschmidt/2023/meetingapp.cgi/Paper/20218 > ) > last week at an international geochemistry conference and has not yet been > published in a peer-reviewed journal. > > "I think there is no doubt that this is a meteorite," said Frank Brenker, a > geologist at the Goethe University Frankfurt in Germany, who was not > involved with the new study. "It is just a matter of debate if it is > really > from Earth." [But, still could be the other way around.] > > Early diagnostic tests show the unusual stone features the same chemical > composition as volcanic rocks on Earth. Interestingly, however, a few of > its elements seem to have been altered into lighter forms of themselves. > These lighter versions are known to occur only upon interacting with > energetic *cosmic rays* ( https://www.space.com/32644-cosmic-rays.html ) > in space, which provided one of two key pieces of evidence > declaring the rock's trip beyond Earth, geologists say. > > Other pending measurements include unambiguous data about how much shock > from the original impact the stone absorbed. This unique signature can be > detected > in the permanently altered microstructures of the mineral crystals forming > the rock. > Estimating the meteorite's shock levels is "something that can be checked > or done > in one hour or so max, using naked eyes," Ferrière said, "thus, not costly > and a > very important observation in this case." > > ( https://cdn.mos.cms.futurecdn.net/uh7CnCZNh4MNnFY78yR2ke.jpg ) > __ > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > https://pairlist2.pair.net/mailman/listinfo/meteorite-list > __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist2.pair.net/mailman/listinfo/meteorite-list
[meteorite-list] Show me the Shock
https://www.space.com/boomerang-meteorite-left-earth-and-returned A dark reddish-brown stone, picked up from the Sahara desert in Morocco a few years ago, appears to be an Earth rock that was flung into space where it stayed for thousands of years before returning home ? surprisingly intact. If scientists are right about this, the rock will officially be named the first meteorite to boomerang from Earth. [Not for certain!] The discovery team's work was *presented* ( https://conf.goldschmidt.info/goldschmidt/2023/meetingapp.cgi/Paper/20218 ) last week at an international geochemistry conference and has not yet been published in a peer-reviewed journal. "I think there is no doubt that this is a meteorite," said Frank Brenker, a geologist at the Goethe University Frankfurt in Germany, who was not involved with the new study. "It is just a matter of debate if it is really from Earth." [But, still could be the other way around.] Early diagnostic tests show the unusual stone features the same chemical composition as volcanic rocks on Earth. Interestingly, however, a few of its elements seem to have been altered into lighter forms of themselves. These lighter versions are known to occur only upon interacting with energetic *cosmic rays* ( https://www.space.com/32644-cosmic-rays.html ) in space, which provided one of two key pieces of evidence declaring the rock's trip beyond Earth, geologists say. Other pending measurements include unambiguous data about how much shock from the original impact the stone absorbed. This unique signature can be detected in the permanently altered microstructures of the mineral crystals forming the rock. Estimating the meteorite's shock levels is "something that can be checked or done in one hour or so max, using naked eyes," Ferrière said, "thus, not costly and a very important observation in this case." ( https://cdn.mos.cms.futurecdn.net/uh7CnCZNh4MNnFY78yR2ke.jpg ) __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist2.pair.net/mailman/listinfo/meteorite-list
