thumbnail

Scanning electron microscope observations of sublimates from Merapi Volcano, Indonesia

Geochemical Journal

By:

Links

  • The Publications Warehouse does not have links to digital versions of this publication at this time

Abstract

Sublimates were sampled from high-temperature (up to 800??C) fumaroles at Merapi volcano in January 1984. Sampling is accomplished by inserting silica tubes into high-temperature vents. Volcanic glass flows through the tubes and sublimates precipitate on the inner walls in response to the temperature gradient. With decreasing temperature (800-500??C) in the tubes, there are five sublimate zones. Texturally, the sublimate phases grade from large, well-formed crystals at their highest-temperature occurrence to more numerous, smaller crystals that are less perfect at lower temperatures. These changes imply that the crystal nucleation and growth rates increase and decrease, respectively, as temperature decreases. Overall, the textural data suggest that the gas is saturated or slightly super-saturated with the phases at their hottest occurrence, but that the gas becomes increasingly super-saturated with the phases at lower temperatures. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Scanning electron microscope observations of sublimates from Merapi Volcano, Indonesia
Series title:
Geochemical Journal
Volume
27
Issue:
4-5
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
337
Last page:
350
Number of Pages:
14