High resolution electron microscopy (UltraSTEM) of the most primitive organic materials in chondrite parent bodies and comets - Formation and evolution of the organic inventory of early Earth.

球粒陨石母体和彗星中最原始有机材料的高分辨率电子显微镜 (UltraSTEM) - 早期地球有机库存的形成和演化。

基本信息

批准号：
276966992
负责人：
Dr. Christian Vollmer
金额：
--
依托单位：
Section Population Biology
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/276966992?language=en
关键词：
resolution electron microscopy UltraSTEM most

项目摘要

Carbonaceous materials were a widespread constituent of the early solar system and hence part of the initial organic inventory of the terrestrial planets. These materials are today preserved in the most primitive carbonaceous chondrites or interplanetary dust particles (IDPs) originating from comets and have not been overprinted by prolonged thermal metamorphism. A tiny fraction of this carbonaceous matter carries fingerprints of low temperature fractionation reactions as isotope enrichments in, e.g., 15N or D. These isotopically anomalous carbonaceous grains have therefore recorded processes in the cold parent molecular cloud of our solar system or the outer reaches of the young solar nebula. Investigations on these grains are therefore key to unravel the evolution of the most primitive organic compounds that were incorporated into the solar system and therefore finally also into the terrestrial planets and the Earth. As Earth has probably lost most volatiles during differentiation or the moon-forming impact, a late addition of organic matter by asteroids or comets is of crucial interest here. In this project, we will investigate these primitive organic materials by an aberration-corrected scanning transmission electron microscope (UltraSTEM) that is exceptionally suited to study these beam-sensitive grains owing to its low acceleration voltage below the knock-on damage threshold of carbon (~ 80 keV). The unique instrumental setup of this microscope also allows to analyse the electronic bonding configuration of organic matter (e.g., aromatic or aliphatic) with high spatial resolution (~ 0.1 nm) that is not achievable by other methods (e.g., synchrotron spectroscopy). First published results (Vollmer et al. 2014) obtained recently by UltraSTEM analyses on isotopically anomalous organic grains from meteorites and IDPs have shown that fluid-induced parent body reactions can transform fragile pristine organic grains by subtle synthesis processes on a very fine scale. We want to expand on these promising results by analyzing a larger set of isotopically anomalous organic grains from diverse primitive meteorites and cometary samples to search for further evidence of these fluid reactions and to build up a catalogue of the most primitive organic compounds in different parent bodies. These investigations will help to understand the evolution of organic matter in the early solar nebula to more complex molecules important for the origin of life on early Earth.

碳质材料是早期太阳系的广泛组成部分，因此是陆地行星初始有机库存的一部分。如今，这些材料保存在最原始的碳质软管或源自彗星的星际尘埃颗粒（IDP）中，并未被延长的热变质造成过多的印记。这种碳质物质的一小部分带有低温分级反应的指纹，例如15n或D的同位素富集。因此，对这些晶粒的研究是阐明最原始的有机化合物的演变的关键，这些有机化合物掺入太阳系中，因此最终也纳入陆地行星和地球。由于地球可能在分化或形成月球形成撞击过程中失去了大多数挥发物，因此在这里，小行星或彗星对有机物的添加至关重要。在该项目中，我们将通过一个异常校正的扫描透射电子显微镜（Ultrastem）来研究这些原始的有机材料，由于其低加速度电压低于碳（〜80 keV）的敲门损伤阈值，因此非常适合研究这些对这些光束敏感的晶粒。该显微镜的独特仪器设置还允许分析具有高空间分辨率（〜0.1 nm）的有机物（例如芳香族或脂肪族）的电子键合配置，这些方法是通过其他方法无法实现的（例如，同步子光谱法）。最近通过对陨石和IDPS的同位素异常有机晶粒进行的超局部分析获得的首次发表的结果（Vollmer等人，2014年）表明，流体诱导的母体身体反应可以通过非常精细的尺度上的微妙合成过程来转化脆弱的原始有机晶粒。我们希望通过分析来自不同原始陨石和彗星样品的一组较大的同位素异常有机晶粒来扩展这些有希望的结果，以搜索这些流体反应的进一步证据，并构建不同母体中最原始的有机化合物的目录。这些研究将有助于理解早期太阳星云中有机物的演变，以使其对早期生命起源至关重要的更复杂的分子。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Challenges and Applications of High Spatial and Energy Resolution EELS for Mapping Functional Chemistry in Beam-Sensitive Materials at Low Acceleration Voltages

高空间和能量分辨率 EELS 在低加速电压下绘制光束敏感材料功能化学的挑战和应用

DOI：
10.1017/s1431927619003131
发表时间：
2019
期刊：
Microscopy and Microanalysis
影响因子：
2.8
作者：
Ramasse Q. M;Kepaptsoglou D;Vollmer C;Hage F;Abellan P.;Leitner J.
通讯作者：
Leitner J.

PRESERVATION OF IMPACT DERIVED METALLIC SPHERULES WITHIN IMPACTITE VESICLES

冲击囊泡内冲击衍生金属球粒的保存

DOI：
10.1111/maps.12934
发表时间：
2017
期刊：
Meteoritics & Planetary Science
影响因子：
2.2
作者：
Vollmer C;Leitner J;Busemann H;Spring N;Ramasse Q. M;Kepaptsoglou D.;Hoppe P.
通讯作者：
Hoppe P.

Isotopic compositions, nitrogen functional chemistry, and low‐loss electron spectroscopy of complex organic aggregates at the nanometer scale in the carbonaceous chondrite Renazzo

碳质球粒陨石 Renazzo 纳米级复杂有机聚集体的同位素组成、氮功能化学和低损耗电子能谱