The primary objective of this proposal is to identify calciumaluminum- rich inclusions (CAls) whose isotopic compositions exhibit large, massdependent Fractionations, Unknown Nuclear effects (FUN). and no reso lvable excesses in 26Mg. FUN CAIs contain vital information regarding the origin and evolution of the early Solar System. However, no absolute ages have been determined for any previously identified FUN CAls. and little material remains for such geochemical studies. Thus. it is critical to locate new FUN (Als in a relatively non-destructive manner, preserving the bulk of material for complementary geochemical study including Pb-Pb age determinations. To successfully achieve this objective, we will conduct a large-scale survey focusing on the isotope systematics ofCAls in carbonaceous chondrite meteorites. Accomplishing these objectives, while consuming min imal amounts of sample. will require the utilization of in situ isotope analyses. All in situ isotopic measurements will be made using laser ablation multi collector inductively coupled plasma mass spectrometry at the Isotope Cosmochemistry and Geochronology Laboratory at Arizona State University. This project will provide significant ins ight into the formation and evolution of the early Solar System and addresses the following science questions:"How did the Sun's fam ily of planets and mi nor bodies originate?"and "How did the Solar System evolve to its current diverse state?"
|Effective start/end date||9/1/12 → 8/31/14|
- NASA: Goddard Space Flight Center: $59,590.00