Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgre..11401008d&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue E1, CiteID E01008
Mathematics
Logic
1
Planetary Sciences: Solar System Objects: Meteorites And Tektites (1028, 3662)
Scientific paper
Nitrogen amount and isotopic composition have been measured in individual chondrules of six ordinary chondrites (OC) and two each of carbonaceous (CC) and enstatite chondrites (EC). The [N (ppm), δ 15Nt (‰) {corrected for cosmogenic contribution}] for the chondrules have ranges of [0.8 to 61, -97 to +164], [19 to 140, -21 to -31], and [2 to 77, -27 to +116] among OC, EC, and CC, respectively. For OC, while N contents of chondrules fall in the range of bulk OC, δ 15N spans a wide range, in contrast to the narrow range (-25 to +14‰) for bulk. For CC chondrules, N contents are lower, while δ 15N is different and heavier than bulk. In contrast, EC chondrules and bulk have comparable N and δ 15N values. Neither N nor δ 15Nt of OC and CC chondrules show any size (expected for nebular exchange) or chemical/mineralogical dependence, ruling out the dominance of secondary effects of nebular or parent body origin. The range of δ 15Nt among OC and CC chondrules represents δ 15Nt heterogeneity of chondrule precursors and their survival after a high-temperature chondrule-forming event. On the basis of δ 15N of the chondrules, we propose the presence of at least three N components carried by phase Q, presolar diamonds (HL), and insoluble organic matter (IOM). The precursors of chondrules from OC and CC are different than the bulk OC and CC, which represents the different environment for their formation, compared to the bulk OC and CC. However, for EC chondrules, precursors as well as the formation environment are the same as those of enstatite chondrites.
Das J. P.
Murty Sripada V. S.
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