DCO Project Summary

Printer-friendly version
Project Title
DMGC - The Origin of Ferropericlase included in Diamonds: Shallow or Deep Mantle Origin?
Start DateEnd Date
2012-11-01 2014-11-01
NameRoleInstitutionDCO ID
Related GrantsDCO ID
11121/5621-4594-2813-8282-CC
11121/8778-4953-8007-5055-CC
Description
Principal Investigator Paolo Nimis, University of Padova, Italy, and co-PIs (Fabrizio Nestola, University of Padova; Mariangela Schiazza, postdoc, University of Padova; Riccardo Reali, graduate student, University of Padova; and Mark Hutchison, Trigon GeoServices Ltd.) are investigating Ferropericlase-bearing diamonds from Juina (Brazil) through in-situ single-crystal X-ray diffraction to obtain information on the orientation of the inclusions relative to their host diamonds and on the pressure of formation to determine formation depths and information about origin.
Project UpdatesClick to add Project Update

Reporting Year 2014 Click to expand


  • RY2014-1 - submitted on Aug 31, 2014

    Update Details:

    [2014-08-15] Ferropericlase-bearing diamonds from Juina (Brazil) were investigated by in-situ single-crystal X-ray diffraction to obtain information on the orientation of the inclusions relative to their host diamonds and on the pressure of formation. All of the seven inclusions studied show the same crystallographic orientation with their a, b and c axes parallel to the a, b and c axes of their respective diamonds. This finding is in contrast with our recent measurements on olivine inclusions in Siberian diamonds and suggests an epitaxial control during the incorporation of the ferropericlase inclusions. Epitaxy is consistent with a syngenetic relationship of ferropericlase and diamond. In-situ unit-cell volume measurements on two inclusions indicate minimum pressures of formation corresponding to a depth of ca. 300 km. Preliminary correction for the effects of non-elastic relaxation in the diamond host suggests formation at depths in excess of ca. 700 km, confirming the lower mantle origin.
Related ProjectsProject URIDCO ID
Related DatasetsDCO ID
Related PublicationsDCO ID


NOTE: Instructions for editing/updating DCO Project information can be found here.
Click on the project DCO-ID to review and edit project information.