Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 248, Issue 1-2, Pages 340-349Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2006.05.037
Keywords
synchrotron; infrared; Raman; microdiamond
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Metamorphic diamonds from the Erzgebirge, Germany have been investigated using synchrotron infrared absorption, Raman scattering, and fluorescence spectroscopy. Infrared absorption features associated with C-C, C-H bonds, molecular H2O, OH- and CO32- radicals, and N-impurities were observed. The results suggest that a carbon-oxygen-hydrogen (COH) supercritical fluid is the most probable concept to explain the origin of diamonds from ultrahigh-pressure metamorphic terranes (UHPM). Investigation of the nitrogen impurities suggests that the Erzgebirge diamonds belong to the Type 1b-1aA, which is similar to metamorphic diamonds from the Kokchetav massif of Kazakhstan and the Western Gneiss Region of Norway, and differentiates them from other nitrogen-bearing diamonds from kimberlitic sources (Type 1 aAB). The occurrence of nitrogen impurities as single atoms in the crystal lattice implies that the Erzgebirge diamonds had a short residence at high-pressure and high-temperature, which therefore suggests a possibility for very fast exhumation. Both infrared and previous studies of nanoinclusions using a transmission electron microscope support a concept of diamond crystallization from a COH rich supercritical fluid. (c) 2006 Elsevier B.V All rights reserved.
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