Zr/Hf ratio in zircons and baddeleyites and chemistry of pyroxenes from some antarctic basaltic achondrites

Details Zr/Hf ratio in zircons and baddeleyites and chemistry of pyroxenes from some antarctic basaltic achondrites Zr/Hf ratio in zircons and baddeleyites and chemistry of pyroxenes from some antarctic basaltic achondrites

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..451b&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 451-452

Computer Science

1

Achondrites, Basalt, Meteoritic Composition, Meteoritic Microstructures, Pyroxenes, Zirconium Compounds, Antarctic Regions, Chemical Composition, Cosmochemistry, Grain Size, Inclusions, Mineralogy, Petrology

Scientific paper

The Zr-bearing minerals, zircon and baddeleyite, are common accessory minerals in Antarctic and non-Antarctic basaltic achondrites, usually from 3 to 30 microns in diameter. Within the set of 11 Antarctic basaltic achondrites, zircons and baddeleyites were found, and in 7 were analyzed by electron microprobe, Zr/Hf ratio was counted, and they were documented for the later SHRIMP ion microprobe measurements. Four samples studied had grains too small to be analyzed. Petrology and pyroxene chemistry of the single clasts were studied. ALHA 81006,33: Narrow En (34-37) was found in two inclusions around baddeleyites; they differ in Wo. Pyroxenes at the whole sample, including those in matrix, have a wide En range from 34 to 62 (mol%). ALHA 81012,6: Pyroxenes of at least 10 different groups of clasts with different textures were separately analyzed. Olivine (Fa 84-88) was found in two inclusions. EET 83231,6: Sample rich in inclusions of various types; pyroxenes with quite narrow En (38-49) are pronounced in two fields, low and high in Wo, only one inclusion has no cpx. EET 83251,21: two different inclusions have either low En 29-35 or opx high in En 66-80. The detailed studies of the pyroxene composition and mainly opx-cpx pairs support the idea that these basaltic achondrites come from either different parent bodies or from various depths. The Antarctic achonrites studied differ in En from many non-Antarctic eucrites. Inclusion A in EET 83251 has exceptionally Mg-rich diogenitic opx. The Zr/Hf ratio supports some differences in these groups -- (1) highest 55-79, (2) lowest 41-46, (3) middle range, mean value 47. For comparison Zr/Hf ratios in Juvinas and Bereba was 32-37, in Jonzac, Millbillillie, and Cachari 41-45, Padvarninkai, Stannern, and Pasamonte 56-62.

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