6533b830fe1ef96bd129702e
RESEARCH PRODUCT
In situ analysis of garnet inclusion in diamond using single-crystal X-ray diffraction and X-ray micro-tomography
Marcello MerliFabrizio NestolaMaya G. KopylovaLuca ZibernaMatteo ParisattoMicaela LongoMurli H. ManghnaniAndrea De StefanoPaolo Nimissubject
Diffractiondiamond garnet inclusion residual pressure x-ray diffraction x-ray micro-tomography jericho kimberliteAnalytical chemistryMineralogyCrystal structureJericho kimberliteengineering.materialdiamondGeochemistry and PetrologyInclusionSettore GEO/06 - MineralogiaX-rayDiamondgarnetx-ray micro-tomographyX-ray diffractionresidual pressurex-ray microtomographydiamond; garnet; Inclusion; X-ray diffraction; x-ray microtomographyX-ray crystallographyengineeringInclusion (mineral)Single crystalKimberliteGeologydescription
A single crystal of garnet enclosed in a diamond from the Jericho kimberlite (Slave Craton, Canada) has been investigated using X-ray diffraction and X-ray micro-tomography. The novel experimental approach allowed us to determine the crystal structure of the garnet. The unit-cell edge a and fractional atomic coordinates of oxygen were used to determine the composition via an updated Margules model for garnets. The composition is Pyr(0.41(5))Alm(0.36(7))Gro(0.22(1))Uva(0.01(1)), which is indistinguishable from the eclogitic garnets found in other Jericho diamonds. We also demonstrated that residual pressures on the inclusion of up to 1 GPa do not affect significantly the determination of the garnet composition by structure refinement.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-01 |