[meteorite-list] Terrestrial meteorite

[Rob Matson]

Excellent point, Alan. This is also the reason we should not expect to find Venusian meteorites on our planet. It’s not so much the dynamics of material transfer to Earth from the deeper solar gravity well of Venus – it’s the absurdly thick atmosphere those impactites would have to pass through to go into a heliocentric, earth-crossing orbit.  --Rob

Sent from Mail for Windows

From: ALAN RUBIN via Meteorite-list
Sent: Wednesday, July 12, 2023 4:57 PM
To: Mark Hammergren
Cc: meteorite-list at meteoritecentral.com; Michael Farmer
Subject: Re: [meteorite-list] Terrestrial meteorite

I discussed the possibility of terrestrial meteorites in Rubin (2015),
Icarus 257, 221-229. Neglecting the effects of the Earth's atmosphere,
it would take five times as much energy to launch a basaltic rock off
the Earth as it would to launch the same mass rock off Mars. Except
for Black Beauty, essentially every shergottite has been severely
shocked during launch off Mars, transforming the crystalline
plagioclase into maskelynite. (A few shergottites with no maskelynite
were shocked-heated even more strongly.) A terrestrial basalt launched
off Earth would be heavily shocked or completely impact melted. This
does not seem to be the case for NWA 13188. I don't think it is
terrestrial.

On Wed, Jul 12, 2023 at 4:36 PM Mark Hammergren via Meteorite-list
<meteorite-list at meteoritecentral.com> wrote:
>
> Thirty years ago, my thesis advisor, Don Brownlee, and I talked about potential terrestrial meteorites and how their "asteroids" might be identified among the population of near-Earth objects. Unfortunately for me at the time, we decided that any strong identification would rely on details of silicate chemistry that are tough to measure through ground-based remote sensing. But we were certain that such bodies must exist.
>
> On the same subject, the moon will be a great place to search for terrestrial meteorites, and may prove to be the best place to investigate the conditions of early Earth. Heck, we might even find fossils.
>
> On Wed, Jul 12, 2023, 12:27 PM Bob King via Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
>>
>> Mike,
>>
>> Go to https://www.researchgate.net/publication/361365963_Northwest_Africa_13188_A_meteorite_from_the_Earth
>> At the top click on the blue bar that says download full text pdf. I just did it and no fee is required.
>>
>> Bob
>>
>> On Wed, Jul 12, 2023 at 9:12 AM Michael Farmer via Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
>>>
>>> Unfortunately paywall
>>>
>>>
>>> Sent from Yahoo Mail for iPhone
>>>
>>> On Wednesday, July 12, 2023, 2:05 AM, Albert Jambon via Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
>>>
>>> There was a presentation at the Goldschmidt Conference in Lyon this week. Here is a link
>>>
>>>
>>>
>>> https://www.newscientist.com/article/2381928-meteorite-left-earth-then-landed-back-down-after-round-trip-to-space/
>>>
>>>
>>>
>>> Albert JAMBON
>>>
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-- 
Alan Rubin
Institute of Geophysics and Planetary Physics
Department of Earth, Planetary, and Space Sciences
University of California
3845 Slichter Hall
603 Charles Young Dr. E
Los Angeles, CA  90095-1567
USA

office phone: 310-825-3202
fax: 310-206-3051
e-mail: aerubin at ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html
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