High C and H Contents of Chondrules

Details High C and H Contents of Chondrules High C and H Contents of Chondrules

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..485h&link_type=abstract

Lunar and Planetary Science, volume 27, page 485

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Carbon, Chondrules, Chondrules: Carbon Content, Chondrules: Hydrogen Content, Hydrogen, Reduction

Scientific paper

Carbon and hydrogen concentrations (reported hereafter as in ppm C and [H] in ppm H2O) of 33 chondrules of all petrological types and sizes, and belonging to some of the least altered and metamorphosed chondrites were determined with the CRPG Nancy ion-microprobe. Special care was taken in order to efficiently get rid of the terrestrial contamination. Before analysis, each sampling area (0~25 micrometers and ~50 micrometers for the smaller chondrules) was sputtered by the O^2- primary beam (20nA) for 5 minutes. Precise chemical concentrations for H and C were obtained for a -60V offset applied to the sample, along with an energy filtering of +/- 10V. Mass resolution (M/Delta M) of 1800 is sufficient to discriminate the 24Mg++ signal from the 12C+. Mid-ocean ridge basalts were used for calibration of C and H. Major element concentrations in phases were obtained by electron probe analysis. Then, in each chondrule, phase proportions were visually estimated allowing the calculation of a bulk concentration for the major elements. [C] and [H] were obtained by two methods : 1) using internal chondrule correlations between individual ion-probe spots for carbon (or H) and major elements contents or 2) by averaging all ion-probe [C] and [H] determinations. _

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