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 <[email protected]> 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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Placitas, NM 87043
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Email: [email protected]
On Wed, Jul 12, 2023 at 5:57 PM ALAN RUBIN via Meteorite-list
<[email protected]> 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
<[email protected]> 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
<[email protected]> 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
<[email protected]> wrote:
Unfortunately paywall
Sent from Yahoo Mail for iPhone
On Wednesday, July 12, 2023, 2:05 AM, Albert Jambon via Meteorite-list
<[email protected]> 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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