| 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 |
| Genre: | Article |
| ProdID: | 70017984 |
| Citation Author: | Symonds, R. |
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| Citation End Page: | 350 |
| Citation Issue: | 4-5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochemical Journal |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Scanning electron microscope observations of sublimates from Merapi Volcano, Indonesia; 1993; Article; Journal; Geochemical Journal; Symonds, R. |
| Citation Start Page: | 337 |
| Citation Volume: | 27 |
| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Scanning electron microscope observations of sublimates from Merapi Volcano, Indonesia; 1993; Article; Journal; Geochemical Journal; Symonds, R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1993 00:00 -0600 |
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