Labile trace elements and cosmogenic radionuclides in chondritic hosts of three consortium igneous inclusions

• Main Authors: Wang,Ming-Sheng, Michlovich,Edward S., Vogt,Stephan, Lipschutz,Michael E.
• Format: Report
• Language: English
• Published: Departments of Chemistry,Purdue University/Departments of Physics,Purdue University/Departments of Chemistry,Purdue University/Departments of Chemistry,Purdue University 1994
• Subjects: Yamato; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4642; http://id.nii.ac.jp/1291/00004642/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4642&item_no=1&attribute_id=18&file_no=1

Three ordinary chondrites from the Yamato Mountains (Y) region of Antarctica contain cm-sized igneous inclusions being studied by a consortium. RNAA data for the labile elements Ag, Bi, Cd, Cs, Ga, In, Rb, Sb, Se, Te, Tl and Zn, and refractory Au and U in the L6 hosts of Y-75097 and Y-793241 indicate that each experienced at least one preterrestrial, high-temperature episode. This heating occurred during formation of the igneous inclusions and/or as a result of the severe shock that affected most equilibrated L chondrites. Cosmogenic 720ka ^<26>Al, and 301ka^<36>Cl (which are determined by AMS) in metal from these two meteorites and nominal terrestrial ages (based on ^<36>Cl) hint that the L6 chondrites are not paired but are inconclusive in this regard. RNAA data for the H chondrite host of Y-794046 generally resemble those of other H4-6 chondrites : its contents of cosmogenic radionuclides in general, and its ^<36>Cl content, in particular, correspond to a nominal terrestrial age of 70±60ka.