A primordial (15)N-depleted organic component detected within the carbonaceous chondrite Maribo.

A primordial (15)N-depleted organic component detected within the carbonaceous chondrite Maribo.
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原始(15)n耗尽的有机成分,在碳质的软骨中检测到。

DOI:
10.1038/s41598-020-77190-z
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发表时间:
2020-11-20
期刊:
影响因子:
4.6
通讯作者:
Hoppe P
Hoppe P
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Vollmer C;Leitner J;Kepaptsoglou D;Ramasse QM;King AJ;Schofield PF;Bischoff A;Araki T;Hoppe P

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我们报告的碳质球粒陨石Maribo内的原始有机物的检测是不同的,从大多数的有机物中发现的外星样品。我们已经应用高空间分辨率技术来获得这种材料的C-N同位素组成,化学和结构信息。相对于陆地值,有机质的15 N含量在δ 15 N ~ -200‰左右,接近当地星际介质的成分。通过电子显微镜进行的形态学研究显示,该物质由分散在陨石基质中的微米至亚微米大小的弥散颗粒组成。电子能量损失和同步辐射X射线吸收近边结构光谱表明,碳功能化学主要由芳香族和C=O键合环境类似的原始有机物从其他碳质方解石。氮功能化学的特征在于C-N双键和三键环境,不同于通常在来自水蚀变碳质泥岩的富含15 N的有机物中发现的环境。我们的调查表明,马里博代表了迄今为止发现的变化最小的CM球粒陨石角砾岩之一,并含有原始有机物质,可能起源于星际介质。
We report on the detection of primordial organic matter within the carbonaceous chondrite Maribo that is distinct from the majority of organics found in extraterrestrial samples. We have applied high-spatial resolution techniques to obtain C-N isotopic compositions, chemical, and structural information of this material. The organic matter is depleted in 15N relative to the terrestrial value at around δ15N ~ -200‰, close to compositions in the local interstellar medium. Morphological investigations by electron microscopy revealed that the material consists of µm- to sub-µm-sized diffuse particles dispersed within the meteorite matrix. Electron energy loss and synchrotron X-ray absorption near-edge structure spectroscopies show that the carbon functional chemistry is dominated by aromatic and C=O bonding environments similar to primordial organics from other carbonaceous chondrites. The nitrogen functional chemistry is characterized by C-N double and triple bonding environments distinct from what is usually found in 15N-enriched organics from aqueously altered carbonaceous chondrites. Our investigations demonstrate that Maribo represents one of the least altered CM chondrite breccias found to date and contains primordial organic matter, probably originating in the interstellar medium.
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