Dating antarcic meteorites Chat room cybersex free member

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If they were from another planetary body, it would have to be substantially identical to Mars as it now is understood."The Martian meteorites are divided into three groups (orange) and two grouplets (yellow).

SHE = Shergottite, NAK = Nakhlite, CHA = Chassignite, OPX = Orthopyroxenite (ALH 84001), BBR = Basaltic Breccia (NWA 7034).

By the early 1980s, it was obvious that the SNC group of meteorites (Shergottites, Nakhlites, Chassignites) were significantly different from most other meteorite types.

Among these differences were younger formation ages, a different oxygen isotopic composition, the presence of aqueous weathering products, and some similarity in chemical composition to analyses of the Martian surface rocks in 1976 by the Viking landers.

The young formation ages of Martian meteorites was one of the early recognized characteristics that suggested their origin from a planetary body such as Mars.A Martian meteorite is a rock that formed on the planet Mars and was then ejected from Mars by the impact of an asteroid or comet, and finally landed on the Earth.Of over 61,000 meteorites that have been found on Earth, 224 were identified as Martian as of January 2019 In October 2013, NASA confirmed, based on analysis of argon in the Martian atmosphere by the Mars Curiosity rover, that certain meteorites found on Earth thought to be from Mars were indeed from Mars.Because Phobos has similarities to C-type asteroids and because the Kaidun meteorite is a carbonaceous chondrite, Kaidun is not a Martian meteorite in the strict sense.However, it may contain small fragments of material from the Martian surface.

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In 2000, an article by Treiman, Gleason and Bogard gave a survey of all the arguments used to conclude the SNC meteorites (of which 14 had been found at the time) were from Mars.

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