(ALH 84001,0) METEORITES FROM MARS 109 GRAM

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(ALH 84001,0) METEORITES FROM MARS 109 GRAM :
$39000.00

ALH 84001 stand for (Allan Hills 84001) was found in Antarctica during the 1984-1985 Antarctic summer. It was found by a team of meteorite hunters from the ANSMET program, which is sponsored by the Polar Programs Office of the U.S. National Science Foundation. ANSMET stands for Antarctica Search for Meteorites, and has been funded since 1977 by the NSF. In that time, ANSMET meteorite hunters have found more than 7000 meteorites, almost triple the number known from outside Antarctica. Stable carbon isotope measurements of the organic matter associated with the carbonate globules and the bulk matrix material in the ALH84001 Martian meteorite indicate that two distinct sources are present in the sample. The δ13C values for the organic matter associated with the carbonate globules averaged −26‰ and is attributed to terrestrial contamination. In contrast, the δ13C values for the organic matter associated with the bulk matrix material yielded a value of −15‰. The only common carbon sources on the Earth that yield similar δ13C values, other than some diagenetically altered marine carbonates, are C4 plants. A δ13C value of −15‰, on the other hand, is consistent with a kerogen-like component, the most ubiquitous form of organic matter found in carbonaceous chondrites such as the Murchison meteorite. Examination of the carbonate globules and bulk matrix material using laser desorption mass spectrometry (LDMS) indicates the presence of a high molecular weight organic component which appears to be extraterrestrial in origin, possibly derived from the exogenous delivery of meteoritic or cometary debris to the surface of Although Mars does not presently appear to have a global dynamo magnetic field, strong crustal fields have recently been detected by the Mars Global Surveyor above surfaces formed V3 or more Ga.Magnetic and textural studies of Martian meteorite ALH84001 demonstrating that 4 Ga carbonates containing magnetite and pyrrhotite carry a stable natural remnant magnetization. Because 40Ar/39Ar therm o-chronology demonstrates that most ALH84001 carbonates have probably been well below the Curie point of magnetite since near the time of their formation [Weiss et al., Earth Planet. Sci. Lett. (2002) this issue], their magnetization originated at 3.9^4.1 Ga on Mars. This magnetization is at least 500 million years older than that known in any other planetary rock, and its strong intensity suggests that Mars had generated a geodynamic and global magnetic field within 450^650 million years of its formation. The intensity of this field was roughly within an order of magnitude of that at the surface of the present-day Earth, sufficient for magneto taxis by the bacteria whose magneto fossils have been reported in ALH84001 and possibly for the production of the strong crustal anomalies. Chromite in ALH84001 may retain even older records of Martian magnetic fields, possibly extending back to near the time of planetary formation.(My personal collection)