Hollow organic globules in the Tagish Lake meteorite as possible products of primitive organic reactions
Hollow organic globules in the Tagish Lake meteorite as possible products of primitive organic reactions
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塔吉什湖陨石中的空心有机球可能是原始有机反应的产物
DOI：
10.1017/s1473550402001167
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发表时间：
2002
影响因子：
1.7
通讯作者：
K. Tomeoka
中科院分区：
文献类型：
--
作者：
K. Nakamura;M. Zolensky;S. Tomita;S. Nakashima;K. Tomeoka
我们首次使用塔吉什湖碳质球粒陨石对任何外星物质中的空心有机球进行了原位观察。来自分析透射电子显微镜、拉曼光谱和微傅里叶变换红外（FTIR）光谱的数据表明，这些球体由脂肪族和含氧官能团组成。空心球形形态与实验室模拟星际冰类似物的紫外线光解和随后的水处理产生的材料惊人地相似，这表明塔吉什湖陨石中的有机球可能是在太阳系形成之前或期间形成的极其原始的有机材料。 FTIR 有机特征还显示出与含 OH 氨基酸在含水矿物质存在下的水热反应形成的膜状产物的强烈相似性。塔吉什湖样本中结构的幸存表明，原始陨石一定将这些结构传递到了早期地球，作为生命可能的前身。
We report the first in situ observation of hollow organic globules in any extraterrestrial material using the Tagish Lake carbonaceous chondrite. Data from analytical transmission electron microscopy, Raman and micro-Fourier-transform infrared (FTIR) spectroscopy indicate that the globules consist of aliphatic and oxygenated functions. The hollow spherical morphologies are strikingly similar to the material produced by the laboratory simulation of ultraviolet photolysis of interstellar ice analogues and subsequent aqueous processing, suggesting that the organic globules in the Tagish Lake meteorite may be extremely primitive organic material that formed before or during the formation of the solar system. The FTIR organic signatures also show strong similarities to the membrane-like products formed from hydrothermal reaction of an OH-bearing amino acid in the presence of hydrous minerals. The survival of the structures in the Tagish Lake sample indicates that primitive meteorites must have delivered these structures to the early Earth as a possible precursor to life.