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.

6 days ago · New research funded by elements of the NASA Astrobiology Program shows that the organic material in the famous Martian meteorite ALH84001 was not formed biologically, but rather by geochemical interactions between water and rock.

ALH 84001 is a meteorite, a rock that fell to Earth from space. It was found in December 1984 in Antarctica by a U.S. meteorite-hunting expedition. When it was found, ALH 84001 weighed about 4 and 3/4 pounds (1.93 kilograms).

Recovered from the Allan Hills ice field of Antarctica in 1984, the 1.9-kg (4.2-pound) igneous rock is thought to have crystallized from magma on Mars 4.5 billion years ago and later to have been shocked and altered, perhaps by one or more nearby meteoroid or asteroid impacts.

4 days ago · Based on its petrography, ALH84001 is a new, and unusual, SNC meteorite classified as a SNC orthopyroxenite. Oxygen Isotope Analysis: Robert Clayton. The oxygen isotope composition of ALH84001 is: δ18O = +4.60; δ17O = +2.65, excess 17O = 0.25. These analyses are indistinguishable from those of Nakhla and Lafayette.

De-spite the criticism on the biogenic-like features in ALH84001, the meteorite has opened a window into the early history of Mars. Clearly low-temperature fluids have left their signatures within the ALH84001 meteorite and subsequent cratering events on Mars have been recorded on observable features within the meteorite.

In 1993, researchers realised that ALH84001 is in fact from Mars, formed from volcanic lava over 4 billion years ago. That made it incredibly ancient, almost as old as the Solar System itself, …

Feb 1, 2022 · The Allan Hills 84001 (ALH 84001) martian meteorite is an approximately four billion-year-old igneous rock composed primarily of the mineral orthopyroxene. It was discovered in Antarctica in 1984 and subsequently studied for …

Jul 31, 2020 · Allan Hills 84001 (commonly abbreviated ALH84001 [1]) is a Martian meteorite that was found in Allan Hills, Antarctica on December 27, 1984, by a team of U.S. meteorite hunters from the ANSMET project.

Abstract-ALH84001 is an igneous meteorite, an orthopyroxenite of martian origin. It contains petrographic evidence of two shock metamorphic events, separated by thermal and chemical events.