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Fe-Ni sulphides in Tagish Lake and CI1 and CM2 carbonaceous chondrites
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Fe-Ni Sulphides within a CM1 clast in Tagish Lake
The composition, abundance and mineral associations of Fe-Ni sulphides within a CM1 clast in Tagish Lake are described, and compared with Fe-Ni sulphides in the carbonate-rich and carbonate-poor lithology of Tagish Lake, as well as Fe-Ni sulphides from CI and CM chondrites
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Different degrees of aqueous alteration in sulphides within the CI1 chondrites
Sulphides in four different CI1 chondrites were analysed, to evaluate their composition, texture and morphology. The results reinforce the view that CI1 chondrites could be divided into two subgroups, based on their level of aqueous alteration
Excited baryon resonances in the relativistic quark model
The masses of positive parity and nonstrange and
strange baryons are calculated in the relativistic quark model. The
relativistic three-quark equations of the multiplets are found in
the framework of the dispersion relation technique. The approximate solutions
of these equations using the method based on the extraction of leading
singularities of the amplitude are obtained. The calculated mass values of the
multiplets are in good agreement with the experimental ones.Comment: latex, 23 pages, 3 figure
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