Concept

Convection mantellique

Publications associées (83)

Raman spectroscopic study of garnet inclusions in diamonds from the mantle transition zone

Raman spectra of syngenetic majoritic garnets were obtained from the Brazilian Sno-Luiz diamond suite. These garnets have a low majoritic content (

2002

Deformation of polycrystalline MgO at pressures of the lower mantle

Philippe Gillet

[1] Room temperature investigations on the shear strength, elastic moduli, elastic anisotropy, and deformation mechanisms of MgO (periclase) are performed in situ up to pressures of 47 GPa using radial X-ray diffraction and the diamond anvil cell. The calc ...

2002

A natural shock-induced dense polymorph of rutile with alpha-PbO2 structure in the suevite from the Ries crater in Germany

Philippe Gillet

A dense post-rutile titanium dioxide (TiO2) phase was discovered in shocked garnet gneisses from the Ries crater by reflected-light microscopy, laser rnicroRaman spectroscopy and micro-beam X-ray diffraction. The Raman spectrum consists of nine bands at wa ...

2001

K-40-Ar-40 constraints on recycling continental crust into the mantle

Philippe Gillet

Extraction of potassium into magmas and outgassing of argon during melting constrain the relative amounts of potassium in the crust with respect to those of argon in the atmosphere. No more than 30% of the modern mass of the continents was subducted back i ...

2000

An Onset of Nucleate Boiling Criterion for Horizontal Flow Boiling

John Richard Thome, Daniel Favrat, Olivier Zürcher

An extensive database has been collected for the evaporation of two hydrofluorocarbon refrigerants (HFC- 134a and the zeotropic mixture HFC- 407C) and the natural refrigerant ammonia (R-717). A model to predict the onset of nucleate boiling has been succes ...

2000

Osmium and lead isotopes of rare OsIrRu minerals: derivation from the core-mantle boundary region?

Anders Meibom, Reto Frei

We report exceptionally high Os-186/Os-188 for rare crystals of OsIrRu found in unconsolidated sediment near Port Orford, SW Oregon (USA), that are held to be derived from peridotite: in the nearby Klamath Mountains. These OsIrRu samples differ in composit ...

1999

A simple chondritic model of Mars

Philippe Gillet

SNC meteorites (Shergottites, Nakhlites and Chassigny) define a fractionation line in a delta(17)O/delta(18)O diagram as expected for rocks differentiated from a formerly homogenized parent body, which is intermediate between H ordinary chondrites and EH e ...

1999

Crossed Beam Pulsed Laser Deposition of cryolite thin films

To deposit cryolite thin films with a composition close to the correct stoichiometry on a silicon substrate, a Direst Pulsed Laser Deposition (DPLD) set-up and a Crossed Beam Pulsed Laser Deposition (CBPLD) set-up have been used. In the case of CBPLD two t ...

1999

Mantle material in the main belt: Battered to bits?

Anders Meibom

The complete (or near complete) differentiation of a chondritic parent body is believed to result in an object with an Fe-Ni core, a thick olivine-dominated mantle and a thin plagioclase/pyroxene crust. Compositional groupings of iron meteorites give direc ...

1996

Experimental-Evidence For Carbonate Stability In The Earths Lower Mantle

Philippe Gillet

We present experimental results on the stability of carbonates up to 50 GPa and at high temperatures (1500-2500 K). The experiments were conducted in a laser-heated diamond anvil cell and the run products were characterized by analytical transmission elect ...

1993

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