Hydrogen isotope compositions in carbonado diamond: Constraints on terrestrial formation

A. Demény, G. Nagy, Bernadett Bajnóczi, Tibor Németh, József Garai, Vadym Drozd, Ernst Hegner

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this study we report the first hydrogen isotope composition analyses on carbonado diamond along with cathodoluminescence and scanning electron microscopic imaging, electron microprobe analyses, and stable (H and C) and radiogenic (Sr) isotope measurements. The hydrogen of bulk carbonado (consisting diamond and pore-filling minerals) yielded ∼ -4‰, consistent with usual crustal or mantle-derived fluids. The diamond-related hydrogen component is about 70 ± 30 ppm and shows a D-depletion down to -200‰. Determined H isotope values - together with C isotope compositions - overlap the ranges for mantle-derived hydrocarbons. Textural characteristics and Sr isotope ratios of pore-filling florencite indicate that the carbonado was formed in a fluid-rich environment, underwent a significant high-temperature influence and finally suffered thorough alteration. Based on these observations, a terrestrial formation during interaction of mantle rocks/melts or subducted crustal materials and reduced C-H fluids seems to be more plausible than an extraterrestrial origin.

Original languageEnglish
Pages (from-to)51-74
Number of pages24
JournalCentral European Geology
Volume54
Issue number1-2
DOIs
Publication statusPublished - Mar 1 2011

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hydrogen isotope
diamond
isotope
mantle
fluid
hydrogen
cathodoluminescence
electron probe analysis
melt
hydrocarbon
electron
mineral
rock

Keywords

  • carbon isotope composition
  • carbonado
  • cathodoluminescence microscopy
  • diamond
  • hydrogen isotope composition
  • Sr isotope ratio
  • texture

ASJC Scopus subject areas

  • Geology

Cite this

Hydrogen isotope compositions in carbonado diamond : Constraints on terrestrial formation. / Demény, A.; Nagy, G.; Bajnóczi, Bernadett; Németh, Tibor; Garai, József; Drozd, Vadym; Hegner, Ernst.

In: Central European Geology, Vol. 54, No. 1-2, 01.03.2011, p. 51-74.

Research output: Contribution to journalArticle

Demény, A. ; Nagy, G. ; Bajnóczi, Bernadett ; Németh, Tibor ; Garai, József ; Drozd, Vadym ; Hegner, Ernst. / Hydrogen isotope compositions in carbonado diamond : Constraints on terrestrial formation. In: Central European Geology. 2011 ; Vol. 54, No. 1-2. pp. 51-74.
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