摘要
Six Chinese ordinary chondrites (four of them have fallen in recent years and the trace element abundances have not yet been reported for the other two) were examined.The contents of 21 elements (Na,Cr,Mn,Sc,Se,Zn,Br,Ni,Fe,Co,Ir,Cu,Ga,As,Au,Sb,Os,W,Re,Pt,and Ru)in the magnetic fractions and 20 elements (Na,K,Ca,Sc,Cr,Mn,Fe,Co,Ni,Zn,Se,Br,La,Sm,Eu,Yb,Lu,Ir,Au,and As) in the non-magnetic fractions were de-termined by INAA. The results indicate that the 5 H-group chondrites show almost no difference in composition,but they are different from the Zhaodong L-group chondrite in elemental abundance.As a normalized element(relative to CI),the concentrations of Ga in the magnetic fractions can be used to classify ordinary chondrites(H-,L- and LL-group).The bulk composition and modal weight of each component calculated from element concentrations in different phases are in good agreement with the bulk rock analyses presented in the literature.
Six Chinese ordinary chondrites (four of them have fallen in recent years and the trace element abundances have not yet been reported for the other two) were examined. The contents of 21 elements (Na, Cr, Mn, Sc, Se, Zn, Br, Ni, Fe, Co, Ir, Cu, Ga. As. Au, Sb, Os, W, Re, Pt, and Ru) in the magnetic fractions and 20 elements (Na, K, Ca, Sc, Cr, Mn, Fe, Co, Ni, Zn, Se, Br, La, Sm, Eu, Yb, Lu, Ir, Au, and As ) in the non-magnetic fractions were de- termined by INAA. The results indicate that the 5 H-group chondrites show almost no difference in composition, but they are different from the Zhaodong L-group chondrite in elemental abundance. As a normalized element (relative to CI), the concentrations of Ga in the magnetic fractions can be used to classify ordinary chondrites (H-, L-and LL-group). The bulk composition and modal weight of each component calculated from element concentrations in different phases are in good agreement with the bulk rock analyses presented in the literature.
