Structure and properties of silicate magmas

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The presence of magmas in the upper mantle has been reported by several geophysical observations. The properties of these magmas are more sensitive to pressure and composition than those at deeper mantle conditions. Thus, understanding the response of the structure and properties of silicate magmas to pressure and composition is significant in discussing the magma mobility and gravitational stability in the mantle, such as the lithosphere-asthenosphere boundary and the base of the upper mantle. This chapter introduces pressure- and composition-induced changes in the structure/property of magmas and their correlation to the macroscopic properties and microscopic structure, with the goal of understanding magma behavior, especially, under upper mantle conditions. High-pressure experiments on silicate melt/glass and newly acquired results are reviewed, focusing on the following four topics: (1) structure of silicate magmas; (2) density of silicate magmas; (3) viscosity of silicate magmas; and (4) elastic wave velocity of silicate glasses. Especially, pressure and compositional (the degree of polymerization) dependences of each feature are described on the basis of the results using a large-volume press.

Original languageEnglish
Title of host publicationMagmas Under Pressure
Subtitle of host publicationAdvances in High-Pressure Experiments on Structure and Properties of Melts
PublisherElsevier
Pages323-341
Number of pages19
ISBN (Electronic)9780128113011
ISBN (Print)9780128112748
DOIs
Publication statusPublished - 2018 Jan 1

Keywords

  • Degree of polymerization
  • Density
  • Elastic wave velocity
  • Intermediate-range order
  • Structure
  • Viscosity

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Structure and properties of silicate magmas'. Together they form a unique fingerprint.

Cite this