Lithium Isotopes in Basaltic Shergottites: Evidence for a Hydrated

Rb-Sr AND Sm-Nd STUDIES OF OLIVINE-PHYRIC SHERGOTTITES RBT 04262 AND LAR 06319: ISOTOPIC EVIDENCE FOR RELATIONSHIP TO ENRICHED BASALTIC SHERGOTTITES

Introduction: RBT 04262 and LAR 06319 are two Martian meteorites recently discovered in Antarctica. Both contain abundant olivines, and were classified as olivinephyric shergottites [1]. A detailed petrographic study of RBT 04262 by [2] suggested it should be reclassified as a lherzolitic shergottite. However, the moderately LREE-depleted REE distribution pattern [3] indicated that it is closel...

SHOCK METAMORPHISM ON BADDELEYITE: IMPLICATION FOR U-Pb ISOTOPIC SYSTEMATICS OF SHERGOTTITES

Introduction: The age significance of isotope chronometers in basaltic shergottites is not agreed yet [1-3]. Bouvier et al. [3] argued that crystallization ages of shergottites were old (~4.1 Ga), and suggested that young ages of shergottites (i.e., ~180 Ma) represent reset by shock metamorphism. Baddeleyite (ZrO 2) is an important mineral for U-Pb dating of basaltic shergottites. By compressio...

Crystallization Experiments of Dar Al Gani Martian Meteoites: a Preliminary

Introduction: Recently, a lot of basaltic shergottites have been found from the desert areas in northern Africa and Middle East Asia. Most of them contain large olivine grains that are not present in the previously known basaltic shergottites (except for EETA79001). These olivine grains are mostly Mg-rich, but they show different mineralogical features in each meteorite. Dar al Gani 476 and its...

Estimates of Oxygen Fugacity in the Basaltic Shergottites from Electron Microprobe Oxygen Analysis

The Magmatism of Mars Inferred from Chemical Composition of Shergottites

Introduction: It is well known that shergottites have a large variation of rare earth elements (REEs) abundance patterns and isotopic compositions. Jones [1] and Borg and Draper [2] suggest that light REEs (LREEs)-enriched shergottites resulted from mixing of a LREEs-enriched component with their parental magma. The LREEsenriched component is thought to be either Martian crust [1] or a KREEP-li...