We have determined an age T = 1.87 AE for Nakhla and an initial s7Sr/S%r, I -0.7028. A rather thorough Sr equilibration took place at this time between all the phases of this meteorite, but there is clear evidence of somewhat incomplete isotopic equilibrium during the 1.87 AE event, which is not consistent with the derivation of Nakhla from a magma at this time. Nakhla has a young model age of ...

Introduction: The Martian meteorites Governador Valadares (GV hereafter) and Lafayette (Laf. hereafter) are finds [1]. GV was found in the Minas Gerais Region (Brazil) in 1958. Laf. was recognized in the collections of Purdue University in Lafayette (Indiana) in 1931. Both belong to the group of nakhlites, which consists of 7 meteorites, including 2 from Antarctica and 2 from Northwest Africa. ...

Major element contents of chondrite groups were volatility controlled and established in a nebula after formation of Ca-Al-rich inclusions but before chondrules formed. Elemental abundances in chondrules tend to correlate with chemical affinity. Calcium was fractionated from Al by a planetary, not a nebular process. Chondrules were contemporaneous with igneous activity and aqueous and thermal m...