Noun Manale, Baklouti Donia, Brunetto Rosario, Borondics Ferenc, Calligaro Thomas, Dionnet Zélia, Le Sergeant d'Hendecourt Louis, Nsouli Bilal, Ribaud Isabelle, Roumie Mohamad, Della-Negra Serge
Institut de Physique Nucléaire d'Orsay, UMR 8608, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France.
Lebanese Atomic Energy Commission, NCSR, Beirut 11-8281, Lebanon.
Life (Basel). 2019 May 30;9(2):44. doi: 10.3390/life9020044.
This study is a multi-technique investigation of the Paris carbonaceous chondrite directly applied on two selected 500 × 500 µm² areas of a millimetric fragment, without any chemical extraction. By mapping the partial hydration of the amorphous silicate phase dominating the meteorite sample matrix, infrared spectroscopy gave an interesting glimpse into the way the fluid may have circulated into the sample and partially altered it. The TOF-SIMS in-situ analysis allowed the studying and mapping of the wide diversity of chemical moieties composing the meteorite organic content. The results of the combined techniques show that at the micron scale, the organic matter was always spatially associated with the fine-grained and partially-hydrated amorphous silicates and to the presence of iron in different chemical states. These systematic associations, illustrated in previous studies of other carbonaceous chondrites, were further supported by the identification by TOF-SIMS of cyanide and/or cyanate salts that could be direct remnants of precursor ices that accreted with dust during the parent body formation, and by the detection of different metal-containing large organic ions. Finally, the results obtained emphasized the importance of studying the specific interactions taking place between organic and mineral phases in the chondrite matrix, in order to investigate their role in the evolution story of primitive organic matter in meteorite parent bodies.
本研究是对巴黎碳质球粒陨石的多技术研究，直接应用于毫米级碎片的两个选定的500×500 µm²区域，无需任何化学提取。通过绘制主导陨石样品基质的无定形硅酸盐相的部分水合作用图谱，红外光谱对流体可能进入样品并使其部分改变的方式提供了有趣的见解。飞行时间二次离子质谱（TOF-SIMS）原位分析能够对构成陨石有机成分的多种化学基团进行研究和绘图。综合技术的结果表明，在微米尺度上，有机物总是在空间上与细粒且部分水合的无定形硅酸盐以及不同化学状态的铁的存在相关联。这些在先前对其他碳质球粒陨石研究中已阐明的系统性关联，通过TOF-SIMS对氰化物和/或氰酸盐的鉴定得到进一步支持，这些可能是母体形成期间与尘埃一起积聚的前体冰的直接残余物，并且通过检测到不同的含金属大有机离子得到支持。最后，所获得的结果强调了研究球粒陨石基质中有机相和矿物相之间发生的特定相互作用的重要性，以便研究它们在陨石母体中原始有机物演化历程中的作用。
