Chemical compositions of the ALH-77302 polymict eucrite

• Main Authors: Takaaki Fukuoka, Noboru Nakamura
• Format: Report
• Language: English
• Published: Department of Chemistry, Faculty of Science, Gakushuin University 1981
• Subjects: Dy; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1213; http://id.nii.ac.jp/1291/00001213/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1213&item_no=1&attribute_id=18&file_no=1

The abundances of 16 major, minor, and trace elements (Fe, Na, Cr, Co, Sr, Ba, Sc, La, Nd, Sm, Eu, Tb, Yb, Lu, Hf and Ta) in two matrices, one fusion crust, 10 igneous clast samples of ALH-77302 polymict eucrite have been determined by instrumental neutron activation analysis. The abundances of 14 minor and trace elements (K, Rb, Sr, Ba, La, Ce, Nd, Sm, Eu, Gd, Dy, Er, Yb and Lu) in a matrix sample of ALH-77302 have been also determined by mass spectrometric isotope dilution method. The chondritic normalized REE patterns of the matrices, fusion crust, and igneous clasts are similar to those of known non-cumulative eucrites. The La abundances in the clasts range from the lowest La abundance in the previously reported non-cumulative eucrites to the highest one. The chemical features of the ALH-77302 polymict eucrite have been discussed in more detail.