Origin of Organic Globules in Meteorites: Laboratory Simulation Using Aromatic Hydrocarbons

Saito, M.; Kimura, Yuki

doi:10.1088/0004-637x/703/2/l147

Cited by 31 publications

(25 citation statements)

References 40 publications

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“…The organic functionality of nanoglobules is in general also IOM-like but often more aromatic with stronger absorption at 285 eV. Some nanoglobules may derive from circumstellar settings as highly primitive polycyclic aromatic hydrocarbons (PAHs) (34) or form late on the parent bodies by aqueous alteration reactions. Cody et al (35) have recently suggested that the bulk of IOM found in chondrites can be synthesized from soluble formaldehyde (H 2 CO) moieties which evolve into more complex, aromatic units upon progressive polymerization by aqueous alteration on the parent body.…”

mentioning

confidence: 99%

Fluid-induced organic synthesis in the solar nebula recorded in extraterrestrial dust from meteorites

Vollmer

Kepaptsoglou

Leitner³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Isotopically anomalous carbonaceous grains in extraterrestrial samples represent the most pristine organics that were delivered to the early Earth. Here we report on gentle aberration-corrected scanning transmission electron microscopy investigations of eight 15 N-rich or D-rich organic grains within two carbonaceous Renazzo-type (CR) chondrites and two interplanetary dust particles (IDPs) originating from comets. Organic matter in the IDP samples is less aromatic than that in the CR chondrites, and its functional group chemistry is mainly characterized by C-O bonding and aliphatic C. Organic grains in CR chondrites are associated with carbonates and elemental Ca, which originate either from aqueous fluids or possibly an indigenous organic source. One distinct grain from the CR chondrite NWA 852 exhibits a rim structure only visible in chemical maps. The outer part is nanoglobular in shape, highly aromatic, and enriched in anomalous nitrogen. Functional group chemistry of the inner part is similar to spectra from IDP organic grains and less aromatic with nitrogen below the detection limit. The boundary between these two areas is very sharp. The direct association of both IDP-like organic matter with dominant C-O bonding environments and nanoglobular organics with dominant aromatic and C-N functionality within one unique grain provides for the first time to our knowledge strong evidence for organic synthesis in the early solar system activated by an anomalous nitrogen-containing parent body fluid. solar nebula | organic matter | meteorites | comets | transmission electron microscopy P rimitive extraterrestrial materials, including unmetamorphosed carbonaceous chondrites, chondritic porous interplanetary dust particles (CP-IDPs), carbonaceous Antarctic micrometeorites, and material from comet 81P/Wild 2, contain isotopically anomalous carbonaceous matter typically enriched in D and/or 15 N compared with the Earth and bulk meteorites (1-11). This carbonaceous matter occurs as diffuse material but also in the form of sub-μm-to μm-sized grains that are extremely enriched in D and/or 15 N and therefore stand out in isotopic maps as so-called "hot spots." These hot spots represent good candidates to study ancient organic compounds that may have served as precursors for the prebiotic history of the early Earth. In many, but not all, cases, the isotopic hot spots occur as so-called "nanoglobules," which are observed as hollow or compact carbonaceous sub-μm spheres in a wide range of primitive extraterrestrial samples (e.g., refs. 11-16). The most widely accepted theory for the origins of the anomalies invokes exothermic ion-molecule isotope exchange reactions at very low temperatures (<25 K) in cold interstellar clouds or the outer reaches of the nascent solar nebula (e.g., refs. 6, 7, 17, and 18). A second possible mechanism for the observed 15 N enrichments is N 2 self-shielding, in which optical depth effects lead to isotopeselective photodissociation (19)(20)(21)(22), but the applicability of the N 2 self-shielding m...

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mentioning

confidence: 99%

Fluid-induced organic synthesis in the solar nebula recorded in extraterrestrial dust from meteorites

Vollmer

Kepaptsoglou

Leitner³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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“…Saito and Kimura (2009) suggested that nanometer sized organic globules could be formed by irradiation of plasma particles such as protons and He + around evolved stars. If the organic globules identified in this study were formed from plasma particles, then their isotope anomalies of D and/or 15 N would be obtained after formation of the organic globules, because significant D-and 15 N-enrichment of organic matter is not expected around evolved stars.…”

Section: Morphology Of the Isotopically Anomalous Organic Mattermentioning

confidence: 99%

Deuterium- and <sup>15</sup>N-signatures of organic globules in Murchison and Northwest Africa 801 meteorites

2015

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“…This is confirmed by fluorescence microscopy (Alpern & Benkheiri 1973), which shows that organic matter occurs as circular particles, evenly distributed in the matrix of hydrated chondrites and with a diameter around a couple of microns. Organic matter has also been observed to form nanoglobules (Nakamura et al 2002;Garvie & Buseck 2004); analogues were produced during laboratory experiment intending to reproduce ejecta gas from evolved stars (Saito & Kimura 2009). …”

Section: How Did the Organics In Carbonacenous Chondrites Form?mentioning

confidence: 99%

Organic material and gases in the early Solar System : the meteorite record

Rémusat

2012

EAS Publications Series

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Abstract. The most primitive chondrites and comets have undergone few modifications during the 4.56 billion years of the Solar System and can deliver to laboratories the components that witnessed the origin of the protosolar nebula. These components include organics, water and other volatile components that were formed in the parent molecular cloud of the solar system or during the protosolar epoch. This paper focuses on organic matter, water and noble gases contained in carbonaceous chondrites with a special emphasis on opened questions that could be assessed by laboratory experiments in order to shed new light on the origin of the solar system materials and planets.

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Origin of Organic Globules in Meteorites: Laboratory Simulation Using Aromatic Hydrocarbons

Cited by 31 publications

References 40 publications

Fluid-induced organic synthesis in the solar nebula recorded in extraterrestrial dust from meteorites

Fluid-induced organic synthesis in the solar nebula recorded in extraterrestrial dust from meteorites

Deuterium- and <sup>15</sup>N-signatures of organic globules in Murchison and Northwest Africa 801 meteorites

Organic material and gases in the early Solar System : the meteorite record

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