DCO Project Summary

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Project Title
DMGC - Diamonds at the Nanoscale - The Initial Growth Stage
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Nanoscale studies of solid and fluid inclusions, defects and trace element distribution in diamond applying TEM and Synchrotron techniques
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Reporting Year 2014 Click to expand

  • RY2014-1 - submitted on Aug 31, 2014

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    August - 2014

    Our study of deep Earth diamonds from Juina yield several exiting findings. In two of the diamonds we were able to identify ringwoodite for the first time, the first is a water-bearing and forsteritic, the second a fayalitic solid solution. Both represent the first ever detected terrestrial occurrences of this important mantle phases which originate from the Earth´s mantle transition zone. High water contents of the forsteritic sample require a wet deep Earth.

    Our combined TEM – SXRF studies on electron transparent slices of milky and cloudy diamonds from the same area yield numerous nm-sized voidites in these specific type of Juina diamonds. These voidites seem toinclude a high nitrogen and hydrogen content which might represent the original fluid from which the diamond grew within the deep Earth and therefore will help to better understand the formation mechanism and physico-chemical conditions of deep Earth diamond growth.

    1. Silversmit, G., Vekemans, B., Appel, K., Schmitz, S., Schoonjans, T., Brenker, F.E., Kaminsky, F. and Vincze, L. (2011) Three-dimensional Fe speciation of an inclusion cloud within an ultra-deep diamond by confocal μ-XANES: evidence for late stage overprint. - Analytical Chemistry 83, 6294-6299.2. Pearson, D.G., Brenker, F.E., Nestola, F., McNeill, J.C.R., Nasdala, L., Hutchison, M.T., Matveev, S., Mather, K., Silversmit, G., Schmitz, S., Vekemans, B. and Vincze, L. (2014) A hydrous mantle transition zone indicated by ringwoodite included within diamond, Nature, doiFurther abstracts see Pearson et al.
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