Meteorites: A Petrologic-chemical Synthesis

abundant accretion Acta ages aggregates Allende analyses Anders Angra dos Reis appears association asteroids basis breccias carbonaceous chondrites Chapter chemical chon chondrules classification clasts CM chondrites components composition condensation consistent contain contents cooling rates Cosmochim crystals cumulate detail diogenites discussed distribution Dodd drites early elements enstatite chondrites et al eucrites evidence fall Figure formation formed fractionation Geochim groups indicate interpretation iron meteorites isotopic Larimer less liquids LL-group lunar major material matrix McSween mean melting mesosiderites metal metamorphism mineralogy minerals minor nebular nickel noted objects observed occur olivine ordinary chondrites origin oxygen pallasites parent bodies petrologic type phases pigeonite plagioclase possibility present pressure processes pyroxene ratios Rb-Sr relationship remains rocks samples separated shock silicates similar solar suggest summarized Table temperatures texture tion trends troilite ureilites variations vary Wasson wide