[meteorite-list] Terrestrial meteorite

[Albert Jambon]

Thanks to all who conributed to the discussion with insightful comments.

Of course we will answer, but a mail to the list is not the appropriate 
place. We will write a paper which will be peer reviewed giving more 
informations than what can be written in an abstract.

Albert


Le 13/07/2023 à 17:23, ALAN RUBIN via Meteorite-list a écrit :
> I hadn't heard that a crystallization age has been determined, but if
> it turns out to be close to 4.5 Ga, then it is even less likely to be
> from Earth.
>
> On Thu, Jul 13, 2023 at 8:21 AM Carl Agee <cb.agee at gmail.com> wrote:
>> I classified something similar but not exactly the same recently. Also plotting in the basaltic andesite field and near the TFL.
>> https://www.lpi.usra.edu/meteor/metbull.php?sea=NWA+15201&sfor=names&ants=&nwas=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&strewn=&snew=0&pnt=Normal%20table&code=78425
>> I definitely would not go out on a limb and say it is an Earth meteorite. It is just one (remote?) possibility for the origin. There are several types of meteorites that plot on or near the TFL, but that does not mean they are from Earth. There is a growing number of ungrouped achondrites that indicate significant basaltic to andesitic volcanism on early solar system bodies.  A crystallization age of NWA 13188 would be important to have to help prove it is from Earth -- I haven't seen the 2023 Goldschmidt abstract (only the 2022 MetSoc abstract). Has an age been determined yet?
>> Carl
>> *************************************
>> Carl B. Agee
>> Director, Institute of Meteoritics
>> Professor, Earth and Planetary Sciences
>> University of New Mexico
>>
>> Shipping Address:
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>>
>>
>>
>>
>>
>> On Wed, Jul 12, 2023 at 5:57 PM ALAN RUBIN via Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
>>>    [EXTERNAL]
>>>
>>> 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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>
>