NDLI: Heterogeneity of grain-size fractions of nanodiamonds from the Orgueil C1 meteorite

Content Provider	Springer Nature Link
Author	Fisenko, A. V. Semjova, L. F.
Copyright Year	2016
Abstract	A model for the composition of meteoritic nanodiamonds is suggested based on analysis of the concentrations and isotopic compositions of C, N, and Xe in the nanodiamond-rich grain-size fractions, which were separated for the first time from the Orgueil CI chondrite. According to the model, meteoritic nanodiamond consists of two populations of grains (denoted C$_{HL}$ and C$_{N}$). The size distributions of grains in populations in the C$_{HL}$ and C$_{N}$ populations are different: the C$_{HL}$ population is finer grained than C$_{N}$. The grains of the C$_{HL}$ population are characterized by a radial gradient in the carbon isotopic composition, and they contain implanted anomalous noble gases (HL component) and the heavy nitrogen isotope $^{15}$N. Following (Clayton et al., 1995), the probable astrophysical source of this population of nanodiamond grains is thought to be the mixing helium and hydrogen shells of a Type-II supernova, and the mechanism that produced these grains was the slow CVD process. The C$_{N}$ population grains have homogeneous isotopic compositions of carbon (δ$^{13}$C ≡–100‰) and nitrogen (δ$^{15}$N ≡–400‰) and contain almost all nitrogen of the nanodiamond-rich fractions. This population of nanodiamond grains was likely formed by a fast unequilibrated process, when shock waves affected organic compounds or gas rich in C- and N-bearing compounds during the early evolution of the protosolar nebula. Calculations within the framework of the model show that the nanodiamond-rich fractions separated from the Orgueil meteorite have the C$_{N}$/C$_{HL}$ ratios varying from 1 in the finest grained fraction to 10 in the coarse-grained one. At these proportions of the populations, weighted mean δ$^{13}$C values of C$_{HL}$ grains in the fractions lie within the range of 42 to 394‰, and the concentrations of $^{132}$Xe-HL and $^{15}$N are (49–563) × 10$^{–8}$ cm$^{3}$/gC and (1.1–6.2) × 10$^{–5}$ cm$^{3}$/gC, respectively.
Starting Page	266
Ending Page	279
Page Count	14
File Format	PDF
ISSN	00167029
Journal	Geochemistry International
Volume Number	54
Issue Number	3
e-ISSN	15561968
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-03-31
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	nanodiamond separation C, N, and Xe in nanodiamond fractions Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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