Evaluating the water‐soluble organic composition of carbonaceous chondrites is key to understanding the inventory of organic matter present at the origins of the solar system and the subsequent processes that took place inside asteroid parent bodies. Here, we present a side‐by‐side analysis and comparison of the abundance and molecular distribution of aliphatic amines, aldehydes, ketones, mono‐ and dicarboxylic acids, and free and acid‐releasable cyanide species in the CM2 chondrites Aguas Zarcas and Murchison. The Aguas Zarcas meteorite is a recent fall that occurred in central Costa Rica and constitutes the largest recovered mass of a CM‐type meteorite after Murchison. The overall content of organic species we investigated was systematically higher in Murchison than in Aguas Zarcas. Similar to previous meteoritic organic studies, carboxylic acids were one to two orders of magnitude more abundant than other soluble organic compound classes investigated in both meteorite samples. We did not identify free cyanide in Aguas Zarcas and Murchison; however, cyanide species analyzed after acid digestion of the water‐extracted meteorite mineral matrix were detected and quantified at slightly higher abundances in Aguas Zarcas compared to Murchison. Although there were differences in the total abundances of specific compound classes, these two carbonaceous chondrites showed similar isomeric distributions of aliphatic amines and carboxylic acids, with common traits such as a complete suite of structural isomers that decreases in concentration with increasing molecular weight. These observations agree with their petrologic CM type‐2 classification, suggesting that these meteorites experienced similar organic formation processes and/or conditions during parent body aqueous alteration.

中文翻译：

---

CM2碳质球粒陨石Aguas Zarcas和Murchison中的地外有机化合物和氰化物

评估碳质球粒陨石的水溶性有机组成是了解太阳系起源处以及小行星母体内发生的后续过程中有机物清单的关键。在这里，我们对CM2球状晶体Aguas Zarcas和Murchison中脂族胺，醛，酮，一元和二元羧酸以及游离和酸可释放的氰化物物种的丰度和分子分布进行了并排分析和比较。Aguas Zarcas陨石是哥斯达黎加中部最近发生的一次陨石，是仅次于Murchison的CM型陨石的最大回收量。我们所调查的有机物种的整体含量在默奇森比在阿瓜斯·扎尔卡斯系统地更高。与以前的气象有机研究相似，与在两个陨石样品中研究的其他可溶性有机化合物相比，羧酸的含量要高一到两个数量级。我们未在Aguas Zarcas和Murchison中鉴定出游离氰化物。但是，在酸萃取水提取的陨石矿物基质后，分析并分析了氰化物种类，并定量分析了阿瓜斯扎尔卡斯地区的氰化物含量，其丰度略高于默奇森。尽管特定化合物类别的总丰度存在差异，但这两种碳质球粒陨石显示出相似的脂肪族胺和羧酸异构体分布，具有共同特征，例如整套结构异构体，其浓度随分子量的增加而降低。这些观察结果与他们的岩石2型CM分类相符，