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Observation and interpretation of paramagnetic defects in Brazilian and Central African carbonados

V. A. Nadolinny, V. S. Shatsky, N. V. Sobolev, D. J. Twitchen, O. P. Yuryeva, I. A. Vasilevsky and V. N. Lebedev
Observation and interpretation of paramagnetic defects in Brazilian and Central African carbonados
American Mineralogist (January 2003) 88 (1): 11-17

Abstract

Electron paramagnetic resonance (EPR) and photoluminescence (PL) spectroscopies have been used to study Brazilian and Central African carbonados. We report the first observation of the N (sub 2) V (super +) and N (super +) (sub 2) nitrogen defect centers in carbonados. The fact that Brazilian carbonados contain the N (sub 3) V (previously reported), N (sub 2) V (super +) , and N (super +) (sub 2) defects, the formation of which requires complicated aggregation of nitrogen, indicates histories at elevated temperature and pressure. The observation of both the radiation-induced Al defect, which has an annealing temperature of 700 K, and radiation defects containing two and/or five vacancies, suggest a continuous process of the formation and transformation of radiation defects in the carbonado under variable pressure and temperature conditions while in the upper mantle. The temperature at which these defects are formed varies from 300 to 1500 K. In addition we report a hydrogen-containing defect labeled H1, previously only observed in synthetic diamonds prepared by chemical vapor deposition. Together with the previously reported light carbon isotope ratio, the results of this study confirm the hypothesis that carbonados are derived from hydrocarbon source material.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 88
Serial Issue: 1
Title: Observation and interpretation of paramagnetic defects in Brazilian and Central African carbonados
Affiliation: Russian Academy of Sciences, Institute of Inorganic Chemistry, Novosibirsk, Russian Federation
Pages: 11-17
Published: 200301
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 40
Accession Number: 2003-024295
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
S34°00'00" - N05°15'00", W74°00'00" - W34°00'00"
S18°00'00" - N11°30'00", E08°30'00" - E31°30'00"
Secondary Affiliation: University of Oxford, GBR, United KingdomRoyal Museum of Central Africa, BEL, Belgium
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200309
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