Organic matter in extraterrestrial water-bearing salt crystals.
Organic matter in extraterrestrial water-bearing salt crystals.
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DOI：
10.1126/sciadv.aao3521
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发表时间：
2018-01
期刊：
影响因子：
13.6
通讯作者：
Mase K
中科院分区：
文献类型：
--
作者：
Chan QHS;Zolensky ME;Kebukawa Y;Fries M;Ito M;Steele A;Rahman Z;Nakato A;Kilcoyne ALD;Suga H;Takahashi Y;Takeichi Y;Mase K
在一颗水火山活跃的小行星的含盐水岩盐晶体中发现了丰富的有机化合物。扎格陨石和莫纳汉斯（1998）陨石中45亿年前的岩盐晶体提供了太阳系外一个富含水的世界存在复杂的生命前化学的直接证据。这项研究提供了第一个全面的有机分析的可溶性和不溶性有机化合物中发现的毫米大小的岩盐晶体含有盐水包裹体，并揭示了原始母体上的水性流体的性质和活动。与这些被捕获的盐水相关联的是有机化合物，它们表现出广泛的化学变化，代表有机前体、中间体和反应产物，这些有机前体、中间体和反应产物构成了生命的前体分子，如氨基酸。该有机化合物还包含具有宽范围结构顺序的含C-、O-和N-的大分子碳材料的混合物，以及芳族、酮、亚胺和/或咪唑化合物。15 N的富集程度与原始Renazzo型碳质玄武岩中的有机质相当，这反映了星际15 N的来源，如氨和氨基酸。Zag岩盐的氨基酸含量偏离了陨石基质，支持岩盐的外源起源，因此，Zag陨石含有在两个不同母体上合成的有机物。我们的研究表明，石盐沉淀的小行星母体，可能是小行星1谷神星，显示了生物学和前生物学相关分子复杂组合的证据。
Abundant organic compounds were detected in brine-bearing halite crystals from a hydrovolcanically active asteroid. Direct evidence of complex prebiotic chemistry from a water-rich world in the outer solar system is provided by the 4.5-billion-year-old halite crystals hosted in the Zag and Monahans (1998) meteorites. This study offers the first comprehensive organic analysis of the soluble and insoluble organic compounds found in the millimeter-sized halite crystals containing brine inclusions and sheds light on the nature and activity of aqueous fluids on a primitive parent body. Associated with these trapped brines are organic compounds exhibiting wide chemical variations representing organic precursors, intermediates, and reaction products that make up life’s precursor molecules such as amino acids. The organic compounds also contain a mixture of C-, O-, and N-bearing macromolecular carbon materials exhibiting a wide range of structural order, as well as aromatic, ketone, imine, and/or imidazole compounds. The enrichment in 15N is comparable to the organic matter in pristine Renazzo-type carbonaceous chondrites, which reflects the sources of interstellar 15N, such as ammonia and amino acids. The amino acid content of the Zag halite deviates from the meteorite matrix, supporting an exogenic origin of the halite, and therefore, the Zag meteorite contains organics synthesized on two distinct parent bodies. Our study suggests that the asteroidal parent body where the halite precipitated, potentially asteroid 1 Ceres, shows evidence for a complex combination of biologically and prebiologically relevant molecules.
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影响因子：
56.9
作者：
Alexander, C. M. O'D.;Bowden, R.;Nittler, L. R.
通讯作者：
Nittler, L. R.
影响因子：
3.7
作者：
Ferrari, AC;Robertson, J
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影响因子：
2.2
作者：
Burton, Aaron S.;Elsila, Jamie E.;Dworkin, Jason P.
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影响因子：
5
作者：
Chan, Queenie H. S.;Zolensky, Michael E.;Cheung, Jacob C. H.
通讯作者：
Cheung, Jacob C. H.
影响因子：
5.3
作者：
Cody, G. D.;Alexander, C. M. O'D.;Mysen, B. O.
通讯作者：
Mysen, B. O.