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Volume 21 Issue 5
Oct 2010
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Article Contents
Larissa F. Dobrzhinetskaya, Harry W. Green II, Naoto Takahata, Yuji Sano, Korato Shirai. Crustal Signature of δ13C and Nitrogen Content in Microdiamonds from Erzgebirge, Germany: Ion Microprobe Studies. Journal of Earth Science, 2010, 21(5): 623-634. doi: 10.1007/s12583-010-0129-6
Citation: Larissa F. Dobrzhinetskaya, Harry W. Green II, Naoto Takahata, Yuji Sano, Korato Shirai. Crustal Signature of δ13C and Nitrogen Content in Microdiamonds from Erzgebirge, Germany: Ion Microprobe Studies. Journal of Earth Science, 2010, 21(5): 623-634. doi: 10.1007/s12583-010-0129-6

Crustal Signature of δ13C and Nitrogen Content in Microdiamonds from Erzgebirge, Germany: Ion Microprobe Studies

doi: 10.1007/s12583-010-0129-6
Funds:  This study was supported by Japanese Society for Promotion of Science
More Information
  • Corresponding author: Larissa F Dobrzhinetskaya, larissa@ucr.edu
  • Received Date: 20 Jul 2010
  • Accepted Date: 24 Aug 2010
  • Publish Date: 01 Oct 2010
  • The study of δ13CPDB (Pee Dee Belemnite) and nitrogen contents in 1 to 5-μm-diameter microdiamonds included in garnets from the quartz-feldspathic gneisses (Erzgebirge, Germany) was performed in situ with the Nano-scale Secondary Ion Mass Spectrometer. The results revealed that there were two stages of diamond crystallization from a C-O-H supecritical fluid rich in biogenic carbon and diverse minor elements of crustal origin. The δ13CPDB of the Erzgebirge diamond of the first stage falls in the range −17‰ to 19‰, with an average value of −17.8‰; the average content of nitrogen is 820 ppm. Diamonds of the second stage are characterized by δ13CPDB=−21.5‰ to −25.5‰, with an average value of −23.24‰; the average nitrogen content is non-homogeneously scattered from 740 ppm to 3 370 ppm among 6 diamonds situated in garnets within the same polished rock slide. Both diamond of the first stage and diamond of the second stage carbon reservoirs belong to biogenic matter, therefore confirming deep subduction of the continental crust sediments and their subsequent exhumation during the Variscan orogeny.

     

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