Primitive achondrites winonaites

Elemental abundances, normalized to Mg and Cl chondrites, for two groups of primitive achondrites (acapulcoites and winonaites) that experienced low degrees of partial melting. These abundances are similar to chondritic abundances (average H-chondrite composition is illustrated). Modified from Mittlefehldt (2004). 

Kimura M., Tsuchiayama A., Fukuoka T., and limura Y. (1992) Antarctic primitive achondrites, Yamato-74025, -75300, and -75305 their mineralogy, thermal history, and the relevance to winonaites. Proc. NIPR Symp. Antarct. Meteorit. 5, 165-190. 

Figure 11 Oxygen isotopic compositions of whole-rock primitive achondrites. Data for a given class are much more scattered than data for differentiated achondrites shown in Figure 10, as a result of incomplete melting and homogenization. Several genetic associations are implied by the data (i) aubrites and enstatite chondrites (ii) acapulcoites and lodranites (iii) lAB irons and winonaites and (iv) ureilites and dark inclusions in carbonaceous chondrites. This and Figure 10 are drawn to the same scale for comparison (source Clayton and Mayeda, 1996).

The winonaites and silicate inclusions in some lAB iron meteorites compose the other major primitive achondrite clan. Choi et al. (1995) compared metal compositions of lAB and IIICD irons and concluded that they represent a single meteorite group. Three IIICD meteorites contain silicate inclusions. McCoy et al. (1993) discussed some petrologic distinctions between them and inclusions in lAB irons, but Choi et al. (1995) did not find these to be compelling arguments... 

Prinz M., Waggoner D. G., and Hamilton P. J. (1980) Winonaites a primitive achondritic group related to silicate inclusions in lAB irons. In Lunar Planet. Sci. XT The Lunar and Planetary Institute, Houston, pp. 902-904. 

---