Experimental investigation of the deep mantle melting properties
type: Dataset
contact point: Organization
  fn: CCSD
keyword: phase-relations
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: fusion-partielle
keyword: proprietes-de-locean-magmatique
keyword: iron
keyword: high-pressure-experiments-in-lh-dac
keyword: partial-melting
keyword: fer
keyword: courbes-de-fusion-dans-le-manteau-inferieur
keyword: lower-mantle-melting-curves
keyword: relations-des-phases
keyword: theses
keyword: properties-of-the-magma-ocean
keyword: infoeu-reposemanticsdoctoralthesis
keyword: partition-coefficients
keyword: coefficients-de-partage
keyword: experiences-de-hautes-pressions
landing page: https://theses.hal.science/tel-00697344
description: During the final stage of accretion, terrestrial planets experienced violent and highly energetic giant impacts. As a consequence of impact heating, the early Earth was partially or wholly molten, forming a magma ocean in the outer layer of Earth. Subsequent cooling of the magma ocean has led to fractional crystallization of the primitive mantle. Many unknowns remain about accretion of the early Earth, such as extension depth and life time of the magma ocean(s), role of mantle recrystallization on the chemical segregation between the different Earth reservoirs, and so on. The knowledge of melting properties of the deep mantle is also important to investigate the possibility of partial melting at the present time. The aim of this study was to tackle a few major questions concerning the Earth lower mantle : What is the melting sequence between the main lower mantle phases ? Can we explain the ultra-low-velocity zones (ULVZ) by partial melting of pyrolitic (or chondritic) mantle ? How does iron partition between liquid and solid silicate phases in the deep mantle ? Can we provide new information on the properties of the deep magma ocean based on the melting curve of the primitive mantle ? Melting curves and melting relations have been investigated using the laser-heated diamond anvil cell (LH-DAC) for pressure between 25 and 135 GPa and temperature up more than 4000 K, i.e. at P-T conditions corresponding to the entire Earth’s lower mantle. Compositions investigated were the join between MgO and MgSiO3 and a model chondritic-composition for the Earth mantle. Two different in situ synchrotron radiation techniques have been used to infer melting properties at high pressures ; X-ray diffraction and X-ray fluorescence spectroscopy. The new results obtained in this study include : (...)
identifier: NNT: 2011CLF22139
issued: 2026-05-18T20:56:13.905693
language: en
modified: 2026-05-18T20:56:13.905699

test_moissonnage_selune
type: Agent

Experimental investigation of the deep mantle melting properties
type: Distribution
access URL: https://theses.hal.science/tel-00697344
format: HTML
issued: 2026-05-18T20:56:13.965105
modified: 2026-05-18T20:56:13.859684