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High Precision Oxygen Three Isotope Analysis of Wild-2 Particles and Anhydrous Chondritic Interplanetary Dust ParticlesOne of the most important discoveries from comet Wild-2 samples was observation of crystalline silicate particles that resemble chondrules and CAIs in carbonaceous chondrites. Previous oxygen isotope analyses of crystalline silicate terminal particles showed heterogeneous oxygen isotope ratios with delta(sup 18)O to approx. delta(sup 17)O down to -50% in the CAI-like particle Inti, a relict olivine grain in Gozen-sama, and an olivine particle. However, many Wild-2 particles as well as ferromagnesian silicates in anhydrous interplanetary dust particles (IDPs) showed Delta(sup 17)O values that cluster around -2%. In carbonaceous chondrites, chondrules seem to show two major isotope reservoirs with Delta(sup 17)O values at -5% and -2%. It was suggested that the Delta(sup 17)O = -2% is the common oxygen isotope reservoir for carbonaceous chondrite chondrules and cometary dust, from the outer asteroid belt to the Kuiper belt region. However, a larger dataset with high precision isotope analyses (+/-1-2%) is still needed to resolve the similarities or distinctions among Wild-2 particles, IDPs and chondrules in meteorites. We have made signifi-cant efforts to establish routine analyses of small particles (< or =10micronsm) at 1-2% precision using IMS-1280 at WiscSIMS laboratory. Here we report new results of high precision oxygen isotope analyses of Wild-2 particles and anhydrous chondritic IDPs, and discuss the relationship between the cometary dust and carbonaceous chondrite chondrules.
Document ID
20110005555
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Nakashima, D. (Wisconsin-Madison Univ. Madison, WI, United States)
Ushikubo, T. (Wisconsin-Madison Univ. Madison, WI, United States)
Zolensky, Michael E. (NASA Johnson Space Center Houston, TX, United States)
Weisberg, M. K. (City Univ. of New York Brooklyn, NY, United States)
Joswiak, D. J. (Washington Univ. Seattle, WA, United States)
Brownlee, D. E. (Washington Univ. Seattle, WA, United States)
Matrajt, G. (Washington Univ. Seattle, WA, United States)
Kita, N. T. (Wisconsin-Madison Univ. Madison, WI, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Geophysics
Report/Patent Number
JSC-CN-22740
Meeting Information
Meeting: 42nd Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 7, 2011
End Date: March 11, 2011
Sponsors: Lunar and Planetary Inst.
Distribution Limits
Public
Copyright
Public Use Permitted.

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