Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmmr13b1710d&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #MR13B-1710
Physics
1028 Composition Of Meteorites (3662, 6240), 6240 Meteorites And Tektites (1028, 3662)
Scientific paper
Chondrules generally show wide range of chemical properties which can be attributed to several processes (e.g. evaporation, condensation and metal/silicate fractionation) occurred during high temperature chondrule forming event and low temperature secondary events (e.g. igneous fractionation) on parent body. To find out which process had maximum impact, we examine the relation between Fe/Mg and Fe/Mn for the individual chondrules in Semarkona (LL3.0), Chainpur (LL3.4), Allende (CV3) and Renazzo (CR2) chondrites. Significant variation of Fe is observed for most chondrules and Renazzo shows the largest range. Chondrules show different trend (mostly depleted in Fe) compared to their host chondrites. CAIs in Allende fall in Mn/Mg chondritic range and show distinct trend on Fe/Mg vs. Fe/Mn plot and lesser variation in Fe compared to chondrules. Relative to CI, chondrules show depletion in Mn relative to Mg, which can be attributed to loss of Mn due to volatility controlled fractionation. Among chondrules and CAIs in Allende, chondrules are more depleted in Mn relative to Mg. This is understandable as chondrules have experienced longer duration of heating, resulting in higher fractionation of Mn. Some chondrules in Semarkona and Chainpur show higher Mg/Mn ratio, indicating effect of igneous process like crystallization. Chainpur chondrules reveal negligible or no effect of secondary alteration as they overlap with Semarkona chondrules. Chondrules in LL chondrites and Allende fall in different regions. This suggests significantly different precursors for them. Variation in Fe is the major effect on the chondrules and this can be attributed to either heterogeneity in chondrule precursors or metal/silicate fractionation (mainly loss of metal/sulfide) during chondrule formation. It is also possible that both the reasons are responsible. Study of CR2 chondrules with larger Fe variation can be useful for further examination.
Das Jayajit
Lee Daehee
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