Abstract 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 δ13C value of the Zag clast was +23.0 ± 4.1‰ which was close to the value of the Tagish Lake meteorite; the δ15N 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 δ15N 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.

中文翻译：

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Zag H球粒陨石中捕虏体碎屑中的原始有机质：可能与D/P小行星有关

摘要 陨石中的一些包体碎屑可能起源于独特的原始太阳系天体。这些碎屑将为了解太阳系的早期演化提供新的见解。我们对 Zag (H5) 陨石中的类 CI 包体碎屑中的有机物 (OM) 进行了多次分析，包括整体元素和同位素分析、FTIR、STXM/XANES 和 NanoSIMS。Zag 碎屑中的大量 C 和 N 丰度分别为 +5.1 ± 0.4 wt.% 和 +0.26 ± 0.01 wt.%，这是在各种球粒陨石群中观察到的最高值。Zag碎屑块体δ13C值为+23.0±4.1‰，与Tagish Lake陨石值接近；δ15N 值为+300±3‰，接近CR球粒陨石和Bells（独特的CM）的值。NanoSIMS获得的富C区域的δD值约为+600至+2000‰，接近CI、CM和Tagish Lake的IOM值。观察到一些同位素“热点”，δD 值高达 ≈ +4000‰，δ15N 值高达 ≈ +5500‰。Zag 碎屑的红外透射光谱与在碎屑中观察到的丰富的页硅酸盐和碳酸盐一致。STXM 以各种形式显示出丰富的 OM。来自 OM 的 C-XANES 光谱通常与 CI/CM/CR 球粒陨石相似。然而，分子结构中存在一些变化。Zag 碎屑中的 OM 部分与碳酸盐有关。功能组，