CLASSIFICATION AND PETROLOGY OF SIX EQUILIBRATION ORDINARY CHONDRITIC METEORITE FINDS FROM WESTERN AUSTRALIA

WA Museum Records and Supplements | Updated 1 decade ago

Abstract: Six stony meteorite finds from Western Australia are described and classIfied. the meteorite: Baandee (H5), Jeedamya (H4), Wooramel (1.5), Mount Margaret (1.5), Nlmbernn (1.6) and Mlllrose (1.6), are all equilibrated ordinary chondrites. Bulk chemical analyses and total iron contents (Fe I) of Baandee (29.1 Xwt.%), Jeedamya (28.28 wt. %), Mount Margaret (224 wt. %) and Wooramel (22.28 wt%) are presented.

The chondrites display degrees of alteration attributable to pre-terrestrial shock-loading appropriate to facies b (Baandee, Jeedamya. Mount Margaret), facies d (Nimberrin. Millrose)
and facies d-e (Wooramel) of the Dodd and Jarosewich (1979) classification. Estimates are made of the P T levels of shock alteration, and the post-shock thermal bistorIes of the meteorites are discussed.