DOI: 10.1016/j.epsl.2018.08.031
Scopus记录号: 2-s2.0-85053013328
论文题名: Towards a structural model for the viscosity of geological melts
作者: Giordano D. ; Russell J.K.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501 起始页码: 202
结束页码: 212
语种: 英语
英文关键词: model
; Raman
; silicate-melt
; structure
; viscosity
; volcanology
Scopus关键词: Geology
; Glass
; Models
; Silicates
; Structure (composition)
; Temperature distribution
; Temperature measurement
; Viscosity
; High temperature measurement
; Low and high frequencies
; Raman
; Silicate melts
; Spectroscopic measurements
; Structural organization
; Thermochemical properties
; volcanology
; Structural properties
; empirical analysis
; magma
; modeling
; parameterization
; Raman spectroscopy
; silicate melt
; viscosity
; volcanic eruption
英文摘要: The viscosity of silicate melts is the most important physical property governing magma transport and eruption dynamics. This macroscopic property is controlled by composition and temperature but ultimately reflects the structural organization of the melt operating at the microscale. At present, there is no explicit relationship connecting viscosity to silicate melt structure and vice versa. Here, we use a single Raman spectroscopic parameter, indicative of melt structure, to accurately forecast the viscosity of natural, multicomponent silicate melts from spectroscopic measurements on glasses preserved on Earth and other planets. The Raman parameter is taken as the ratio of low and high frequency vibrational bands from the silicate glass by employing a green source laser wavelength of 514.5 nm (R514.5). Our model is based on an empirical linkage between R514.5 and coefficients in the Vogel–Fulcher–Tammann function for the temperature dependence of melt viscosity. The calibration of the Raman-based model for melt viscosity is based on 413 high-temperature measurements of viscosity on 23 melt compositions for which published Raman spectra are available. The empirical model obviates the need for chemical measurement of glass compositions, thereby, providing new opportunities for tracking physical and thermochemical properties of melts during igneous processes (e.g., differentiation, mixing, assimilation). Furthermore, our model serves as a milepost for the future use of Raman spectral data for predicting transport (and calorimetric) properties of natural melts at geological conditions (e.g., volatiles and pressure) and production. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109663
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Earth Sciences Department, University of Turin, Via Valperga Caluso, 35, Turin, 10125, Italy; Earth, Ocean & Atmospheric Sciences, The University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
Recommended Citation:
Giordano D.,Russell J.K.. Towards a structural model for the viscosity of geological melts[J]. Earth and Planetary Science Letters,2018-01-01,501