Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phdt........82m&link_type=abstract
"PhD thesis, Università degli Studi di Bari "Aldo Moro"
Other
Chondrule Microstructures, Enstatite Chondrite, Mesostasis, Cr Sulfides
Scientific paper
In order to determine if and to what extent compositional features of chondrules are related to enstatite chondrite properties, the mineralogy and chemistry of enstatite chondrite type 3 chondrules together with other phases of an EL3 and three EH3 chondrites have been investigated by optical microscope, scanning and transmission electron microscope and electron microprobe techniques. It was observed that the criteria of classification used for ordinary chondrite chondrules (Sears,1992,1995) were not appliable for classifying chondrules investigated in this work. It was not appliable the criterion for distinguishing chondrules on the basis of the variation diagram FeO%-CaO% in olivine, and neither was the criterion for distinguishing EH3 and EL3 based on chondrule mesostasis compositions. Furthermore, high sodium content was found in EET90299 (EL3) chondrules comparable with SAH97072 (EH3) chondrules. This high Na content in EET90299 could have been the result of similar cooling rate as for SAH97072 (as proposed by Schneider et al., 2002) but it could indicate also that Na in mesostasis has not to be related to the chondrite class. So, these Na contents could have had a primary origin, related to chondrule formation more than a secondary one, related to the host chondrite. Furthermore, TEM investigations showed tiny (TEM scale) Fe-Cr-Ti, Cr-Ti sulfides and Fe metal particles occurrences that have never been reported in mesostasis. These might have been already present in the melt pre-chondrule formation, or they could be a result product of Cr redistribution during thermal metamorphism in the chondrite. According to Bendersky et al. (2007) these could formed by Cr-diffusion from oxide to sulfide. So, they inferred that Cr sulfides in enstatite chondrules formed by body precursor metamorphic processes. The hypothesis of a common parent body could explain the chondrules distribution in EH and EL. Different depth of the precursor body could also explain different microstructures in Fe-Ni alloy found in EET90299 EL3 and SAH97072 EH3.
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