A simple model of oscillatory zoning in magmatic plagioclase: Development of an isothermal undercooling model

Akira Tsune, Atsushi Toramaru

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

According to the model of Sibley et al. (1976), the alternate switching of the crystal surface between smooth and rough states results in a drastic change in the growth velocity and the subsequent development of oscillatory zoning (OZ). In the present paper, we develop the isothermal undercooling mechanism of the Sibley et al. model and calculate the magnitudes of the amplitude and wavelength of OZ to check the validity of the Sibley et al. model. We assume that the growth velocity depends on the roughness of the crystal surface. The roughness is expressed as a function of the surface area, and it is found that the growth velocity varies twice due to the switching. We also assume that the surface states change when steady states are achieved or when the growth and diffusion velocities are balanced. Simulating the diffusion-reaction on the supposition that the thickness of the diffusion layer is fixed, we determine the concentrations at which the switching takes place. We simulate the OZ growth based on these mathematical considerations. The results show that the magnitudes of the calculated amplitude and wavelength agree with those observed in nature.

Original languageEnglish
Pages (from-to)1071-1079
Number of pages9
JournalAmerican Mineralogist
Volume92
Issue number7
DOIs
Publication statusPublished - Jul 1 2007

Fingerprint

Zoning
Undercooling
supercooling
plagioclase
zoning
crystal surfaces
roughness
Surface roughness
crystal
wavelength
Wavelength
Crystals
Surface states
wavelengths
surface area

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

A simple model of oscillatory zoning in magmatic plagioclase : Development of an isothermal undercooling model. / Tsune, Akira; Toramaru, Atsushi.

In: American Mineralogist, Vol. 92, No. 7, 01.07.2007, p. 1071-1079.

Research output: Contribution to journalArticle

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