Université de Neuchâtel

Li, B and Be Contents of Harzburgites from the Dramala Complex (Pindos Ophiolite, Greece): Evidence for a MOR-type Mantle in a Supra-subduction Zone Environment

Pelletier, Laure ; Vils, Flurin ; Kalt, Angelika ; Gméling, Katalin

In: Journal of Petrology, 2009, vol. 49, no. 11, p. 2043-2080

The Pindos ophiolite represents oceanic lithosphere obducted during the Jurassic. The Dramala mantle section mainly consists of highly depleted spinel harzburgite and minor plagioclase-bearing harzburgite. Textural observations and major element compositions of minerals indicate that the harzburgites experienced impregnation by a mafic, depleted melt and subsequent high-temperature (high-T)...

Université de Fribourg

K-shell double photoionization of Be, Mg, and Ca

Kheifets, A. S. ; Bray, Igor ; Hoszowska, Joanna

In: Physical Review A, 2009, vol. 79, no. 4, p. 042504

We perform convergent close-coupling calculations of double photoionization (DPI) of the K-shell of alkaline-earth metal atoms (Be, Mg, and Ca) from the threshold to the nonrelativistic limit of infinite photon energy. Theoretical double-to-single photoionization cross-section ratios for Mg and Ca are compared with experimental values derived from high-resolution x-ray spectra following the...

Université de Neuchâtel

Light elements in oceanic and ophiolitic serpentinities

Vils, Flurin Andri ; Katz, Angelika (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th.2064.

Despite the key importance of altered oceanic mantle as a repository and carrier of light elements (B, Li, and Be) to depth, its inventory of these elements has hardly been explored and quantified. In order to constrain the systematics and budgets of these elements in the oceanic lithosphere, this thesis has studied samples of highly serpentinized peridotites from the mid-Atlantic ridge (ODP Leg...

Université de Neuchâtel

Emplacement of ultramafic rocks into the continental crust monitored by light and other trace elements: An example from the Geisspfad body (Swiss-Italian Alps)

Pelletier, Laure ; Müntener, Othmar ; Kalt, Angelika ; Vennemann, Torsten W. ; Belgya, Tamás

In: Chemical Geology, 2008, vol. 25, no. 1-2, p. 143-159

In order to evaluate the influence of continental crustal rocks on trace element budgets of serpentinized peridotites incorporated into the continental crust, we have analyzed the chemical composition of whole rock samples and minerals of the Geisspfad ultramafic complex (Swiss-Italian Alps). This complex represents a relict oceanic succession composed of serpentinites, ophicarbonates and...

Université de Neuchâtel

The oceanic mantle as an important repository for the light elements Li, Be and B

Pelletier, Laure ; Kalt, Angelika (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th.1988.

It is important to quantify the Li, Be and B content of oceanic peridotites, in order to evaluate their contributions to the light element input in subduction zones (compared to oceanic crust). In previous studies, the input related to oceanic mantle was usually neglected, because no strong data are available for the light element contents (minerals, whole rock samples). The objective of this...