Skip to Main content Skip to Navigation
Theses

L'Hafnium dans les zones de subduction: Bilan isotopique des flux entrant et sortant

Abstract : Subduction zones are the primary regions of mass exchanges between continental crust and mantle of Earth through sediment subduction toward the earth's mantle and by supply of mantellic magmas to volcanic arcs. We analyze these mass exchanges using Hafnium and Neodymium isotopes. At the Izu-Mariana subduction zone, subducting sediments have Hf and Nd isotopes equivalent to Pacific seawater. Altered oceanic crust has Hf and Nd isotopic compositions equivalent to the isotopic budget of unaltered Pacific oceanic crust. At Luzon and Java subduction zones, arc lavas present Hf isotopic ratios highly radiogenic in comparison to their Nd isotopic ratios. Such compositions of the Luzon and Java arc lavas are controlled by a contamination of their sources by the subducted oceanic sediments.
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00006357
Contributor : Jean-Christophe Marini <>
Submitted on : Wednesday, June 30, 2004 - 5:26:12 PM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:27:19 PM

Identifiers

  • HAL Id : tel-00006357, version 1

Collections

Citation

Jean-Christophe Marini. L'Hafnium dans les zones de subduction: Bilan isotopique des flux entrant et sortant. Géochimie. Université Joseph-Fourier - Grenoble I, 2004. Français. ⟨tel-00006357⟩

Share

Metrics

Record views

461

Files downloads

1284