A new experimental technique for extracting liquids from peridotite at very low degrees of melting: application to partial melting of depleted peridotite |
| |
Authors: | Email author" target="_blank">Didier?LaporteEmail author Michael?J?Toplis Monique?Seyler Jean-Luc?Devidal |
| |
Institution: | (1) Laboratoire Magmas et Volcans, CNRS et Université Blaise Pascal, OPGC, 5 rue Kessler, 63038 Clermont-Ferrand, France;(2) CRPG-CNRS, BP20, 54501 Vandoeuvre-lès-Nancy, France;(3) Laboratoire de Géosciences Marines, CNRS-UMR 7097, Institut de Physique du Globe de Paris, Case 89, 4 place Jussieu, 75252 Paris cedex 05, France |
| |
Abstract: | A new technique that allows extraction of liquids from peridotite at degrees of melting as low as 0.2 wt% is presented. Microfractures that formed in the graphite sample container at the beginning of the experiments were used as traps for the liquid phase. Glass-filled cracks (or 'microdikes') unaffected by quench crystallisation were produced in all experiments and were analysed using standard electron microprobe techniques. Reversal experiments demonstrated that, at moderate degrees of melting (4.4 and 6.5 wt%), the segregated liquid was in equilibrium with the neighbouring peridotite. At very low degrees of melting (0.3 wt%), the liquid in the microdikes failed to fully equilibrate with the peridotite after 5 days and the sandwich technique was used in combination with the microdike technique to approach more closely the equilibrium composition of near-solidus partial melts. The microdike technique was used to study melting of a depleted peridotite at 1 GPa and 1,220 to 1,360 °C.Editorial responsibility: T.L. Grove |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|