منابع مشابه
Identification (or Otherwise) of Martian Carbon in Martian Meteorites
Introduction: One of the goals of current martian exploration is to search for evidence of extinct (or even extant) life. In recent years, this goal has been interpreted as a search for evidence of water on Mars’ surface. The success of instrumentation (high resolution cameras and infrared spectrometers) on orbiting spacecraft, coupled with in situ data from the MER rovers have revolutionized o...
متن کاملIsotopic Evidence for a Martian Regolith Component in Martian Meteorites
Introduction: Noble gas measurements in gas-rich impact-melt (GRIM) glasses in EET79001 shergottite showed that their elemental and isotopic composition is similar to that of the Martian atmosphere [1-3]. The GRIM glasses contain large amounts of Martian atmospheric gases. Those measurements further suggested that the Kr isotopic composition of Martian atmosphere is approximately similar to tha...
متن کاملMartian surface paleotemperatures from thermochronology of meteorites.
The temporal evolution of past martian surface temperatures is poorly known. We used thermochronology and published noble gas and petrographic data to constrain the temperature histories of the nakhlites and martian meteorite ALH84001. We found that the nakhlites have not been heated to more than 350 degrees C since they formed. Our calculations also suggest that for most of the past 4 billion ...
متن کاملThe pre-atmospheric size of Martian meteorites
φn = P'(Krn)/σ79, (3) where P'(Krn) = 2.33 Â P(Krn) and has the dimension neutrons cms. The resonance integral σ79 is 110 Â cm [3]. Fig. 1 demonstrates the resulting neutron fluxes. They are shown in relation to the fluxes of > 5 MeV neutrons that were calculated based on cosmogenic Ne [8]. Two scenarios are possible how the meteoritic material might have experienced the observed neutron fluxes...
متن کاملAges and Geologic Histories of Martian Meteorites
We review the radiometric ages of the 16 currently known Martian meteorites, classified as 11 shergottites (8 basaltic and 3 lherzolitic), 3 nakhlites (clinopyroxenites), Chassigny (a dunite), and the orthopyroxenite ALH84001. The basaltic shergottites represent surface lava flows, the others magmas that solidified at depth. Shock effects correlate with these compositional types, and, in each c...
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ژورنال
عنوان ژورنال: Mineralogical Journal
سال: 1997
ISSN: 1881-4174,0544-2540
DOI: 10.2465/minerj.19.65