Statistics – Applications
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmmb52a..06n&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #MB52A-06
Statistics
Applications
5205 Formation Of Stars And Planets, 6023 Comets: Dust Tails And Trails (6210), 1028 Composition Of Meteorites (3662, 6240), 1041 Stable Isotope Geochemistry (0454, 4870), 1094 Instruments And Techniques
Scientific paper
Primitive meteorites and interplanetary dust particles (IDPs) collected in the Earth's stratosphere contain microscale components with highly unusual isotopic compositions, relative to most materials in the Solar System. These components include presolar mineral grains that formed in stellar outflows and explosions [1] and organic matter that originated in cold interstellar clouds [2]. Over the last two decades, advances in Secondary Ion Mass Spectrometry (SIMS) technology have allowed the isotopic compositions of these materials to be probed on ever smaller spatial scales. With the advent of the high-sensitivity Cameca NanoSIMS ion microprobe, it is now possible to investigate isotopic variations on <500nm spatial scales and correlate these with information obtained by complementary microanalysis techniques (e.g., TEM, STXM). This talk will review recent applications of SIMS isotopic imaging to the identification and characterization of presolar materials in meteorites and IDPs, including presolar grains from red giant stars and supernovae and presolar organic matter from interstellar space. Because many IDPs are believed to originate from comets, it is also expected that the cometary samples recently returned by NASA's STARDUST mission will contain isotopically anomalous materials on a microscale. Preliminary SIMS analyses of these samples have begun and will be discussed. [1] Nittler L. R. (2003) EPSL, 209, 259-273. [2] Busemann H., et al. (2006) Science, in press.
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