Multiple core growth structure and nitrogen abundances of diamond crystals from Shandong and Liaoning kimberlite pipes, China

Taijin Lu*, Hua Chen, Zhili Qiu, Jian Zhang, Ran Wei, Jie Ke, Ichiro Sunagawa, Richard Stern, Thomas Stachel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Diamond crystals from the Shandong and Liaoning kimberlites, China, display a distinct "seed-like" multiple core growth structure with multi-stage growth history. Cathodoluminescence and DiamondView images revealed that the core portion of the diamonds is occupied by a "seed-like" precipitated or smaller core which could be a resorbed early crystal formed by a cuboid growth mechanism. At the boundary between the core portion and the octahedral layers, the nitrogen concentration drops abruptly to ∼1 ppm from a few hundreds of ppm in the core portion, suggesting a fundamental change in geochemical growth environments in the mantle. This is associated with a switch in zoning trends in δ 13C from outward increasing to outward decreasing values, confirming that a change in growth conditions occurred.

Original languageEnglish
Pages (from-to)651-656
Number of pages6
JournalEuropean Journal of Mineralogy
Volume24
Issue number4
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Keywords

  • Carbon isotope
  • China
  • Diamond
  • Multiple core growth
  • Nitrogen
  • SEM CL characterization

Fingerprint

Dive into the research topics of 'Multiple core growth structure and nitrogen abundances of diamond crystals from Shandong and Liaoning kimberlite pipes, China'. Together they form a unique fingerprint.

Cite this