Primordial organic matter in the xenolithic clast in the Zag H chondrite: Possible relation to D/P asteroids

• Published in: Geochimica et Cosmochimica Acta
• Main Authors: Kebukawa Yoko, Zolensky Michael E., Ito Motoo, Ogawa Nanako O., Takano Yoshinori, Ohkouchi Naohiko, Nakato Aiko, Suga Hiroki, Takeichi Yasuo, Takahashi Yoshio, Kobayashi Kensei
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2020
• Subjects: Chondrites; Organic matter; Aqueous alteration; EA/IRMS; FTIR; STXM; XANES; NanoSIMS; Tagish; Tagish Lake
• Online Access: http://hdl.handle.net/10131/00012914; https://ynu.repo.nii.ac.jp/?action=repository_uri&item_id=10252; https://ynu.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10252&item_no=1&attribute_id=20&file_no=1; https://ynu.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10252&item_no=1&attribute_id=20&file_no=2

Some xenolithic clasts in meteorites may have originated from unique primitive Solar System bodies. These clasts would provide novel insights into the early evolution of the Solar System. We conducted multiple analyses of organic matter (OM) in a CI-like xenolithic clast in the Zag (H5) meteorite including bulk elemental and isotopic analysis, FTIR, STXM/XANES, and NanoSIMS. The bulk C and N abundances in the Zag clast were +5.1 ± 0.4 wt.% and +0.26 ± 0.01 wt.%, respectively, which were the highest observed among various chondrite groups. The bulk δ^13C value of the Zag clast was +23.0 ± 4.1‰ which was close to the value of the Tagish Lake meteorite; the δ^15N value was +300 ± 3‰ which was close to the values of CR chondrites and Bells (a unique CM). The δD values of C-rich regions obtained by NanoSIMS were approximately +600 to +2000‰ which were close to the values of IOM from CI, CM and Tagish Lake. Some isotopic “hot spots” were observed with δD values up to ≈ +4000‰ and δ^15N values up to ≈ +5500‰. The infrared transmission spectrum of the Zag clast was consistent with the abundant phyllosilicates and carbonates observed in the clast. The STXM showed abundant OM in various forms. C-XANES spectra from the OM were generally similar to CI/CM/CR chondrites. However, some variations existed in the molecular structures. OM in the Zag clast was partially associated with carbonates. The functional group, elemental and isotopic signatures of the OM in the Zag clast support the idea that the Zag clast is unique among known carbonaceous chondrite groups and originated from the outer Solar System such as aqueously-altered D/P type asteroids.