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Allan Hills 84001 (ALH84001 [1]) is a fragment of a Martian meteorite that was found in the Allan Hills in Antarctica on December 27, 1984, by a team of American meteorite hunters from the ANSMET project. Like other members of the shergottite–nakhlite–chassignite (SNC) group of meteorites, ALH84001 is thought to have originated on Mars ...
The Martian meteorite NWA 7034 (nicknamed "Black Beauty"), found in the Sahara desert during 2011, has ten times the water content of other Mars meteorites found on Earth. [2] The meteorite contains components as old as 4.42 ± 0.07 Ga (billion years), [ 25 ] and was heated during the Amazonian geologic period on Mars.
ALH 84001 is an extraterrestrial example of an orthopyroxenite. It is an achondrite meteorite from Mars. Orthopyroxenite is an ultramafic and ultrabasic rock that is almost exclusively made from the mineral orthopyroxene, the orthorhombic version of pyroxene and a type of pyroxenite. It can have up to a few percent of olivine and clinopyroxene.
An electron microscope reveals bacteria-like structures in meteorite fragment ALH84001. In 1996, the Martian meteorite ALH84001, a specimen that is much older than the majority of Martian meteorites that have been recovered so far, received considerable attention when a group of NASA scientists led by David S. McKay reported microscopic ...
Meteorite Found Mass (g) Notes Allan Hills 77005: 1977-12-29 482.5 First Antarctic find. Allan Hills 84001: 1984 1939.9 Orthopyroxenite, 4.091 billion years old, is believed to be the oldest Martian meteorite. Chassigny: 1815-10-03 4000 Mainly olivine with intercumulous pyroxene, feldspar, and oxides. Dar al Gani 476: 1996-2000 2015 Dar al Gani ...
The thermal remanent magnetization of carbonates in meteorite ALH84001 [5] revealed that the early (4.1–3.9 Ga) Martian magnetic field was ~50 μT, much higher than the modern field, suggesting that a Martian dynamo was present until at least this time.
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They are similar to the structures found in ALH84001, a Mars meteorite found in the Antarctic. A 2022 study concluded that ALH84001 did not contain Martian life; the discovered organic molecules were found to be associated with abiotic processes (ie, "serpentinization and carbonation reactions that occurred during the aqueous alteration of ...
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