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Introduction
Publications
Publications (13)
In this study we report the first direct evidence for water-bearing fluids in the uppermost lower mantle from natural ferropericlase crystal contained within a diamond from São Luíz, Brazil. The ferropericlase exhibits exsolution of magnesioferrite, which places the origin of this assemblage in the uppermost part of the lower mantle. The presence o...
Sublithospheric diamonds that sample the transition zone and uppermost lower mantle provide a unique view into the deep Earth. In order to investigate the origin of diamond-forming C-H-O-N fluids within the deep mantle, within the framework of the terrestrial deep volatile cycle, we conducted a delta C-13-delta N-15-[N] micro-analytical study, by s...
Primarily on the basis of C, N, S, and O stable isotope systematics, this
article reviews recent achievements in understanding diamond formation
and growth in Earth’s mantle. Diamond is a metasomatic mineral that results
from either the reduction or oxidation of mobile C-bearing liquids
(fluids or melts) that intrude preexisting lithologies (eclogi...
Twenty-one sulphide inclusion-bearing diamonds from the Finsch mine, South Africa, were analysed for nitrogen abundances and carbon isotope compositions by microbeam methods. On the basis of sulphide Ni contents, one diamond is of peridotitic affinity, the rest belongs to the eclogitic suite.FTIR analyses show nitrogen abundances and aggregation st...
The infrared characteristics of 21 sulphide inclusion-bearing diamonds from Finsch Mine, 1 sulphide inclusion-bearing diamond from Udachnaya and 18 silicate inclusion-bearing diamonds from Premier were examined and modelled to investigate the complexity of diamond genesis. Internal heterogeneities in N-abundance and aggregation state within individ...
Diamond, as the deepest sample available for study, provides a unique opportunity to sample and examine parts of the Earth’s mantle not directly accessible. In order to provide further constraints on mantle convection and deep volatile cycles, we analysed nitrogen and carbon isotopes and nitrogen abundances in 133 diamonds from Juina (Brazil) and K...
Constraining the convective regime of the Earth's mantle has profound implications for our understanding of the Earth's cooling and the geodynamics of plate tectonics. Although subducting plates seem to be occasionally deflected at 660 km, evidence from seismic tomography and fluid dynamics suggest that substantial amounts of material reach the cor...
In order to study the geochemistry of diamonds formed during similar growth conditions in a very localised environment in the mantle, we carried out a detailed study of the variation in δ15N, δ13C, N content, and N aggregation state of 35 diamonds in a single eclogite xenolith from the Kaalvallei kimberlite in South Africa.Diamond nitrogen contents...
