Other
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.191..115m&link_type=abstract
Earth and Planetary Science Letters, Volume 191, Issue 1-2, p. 115-127.
Other
6
Scientific paper
We present the first investigation of in situ high-pressure and high-temperature bubble growth in silicic melts. In a hydrothermal diamond-anvil cell, a haplogranite melt (79 wt% SiO2) is hydrated then subjected to cooling and decompression. With decreasing pressure, water exsolves from the melt and bubbles grow. The whole experiment is observed through an optical microscope and video-recorded, so that bubble nucleation, bubble growth, and the glass transition are directly monitored. Bubbles nucleate and expand in melt globules having radii from 15 to 70 μm. Bubbles reached 3.6-9.1 μm in radius within 6.1-11.7 s (until the glass transition is attained) while temperature decreases from 709-879°C to 482-524°C, corresponding to decompressions from 7.0-21.9 to 3.4-15.2 kbar. Bubbles nucleated either in a single event occurring within the first second or in successive pulses over a period of up to 7 s when the melt globules are in contact with a diamond culet of the cell. In these experiments, bubble growth can be fitted to the cube root or a logarithm of time, mainly ascribable to the combination of large water oversaturations due to rapid cooling and decompression. At pressures of 3.4-15.2 kbar, we measure glass transition temperatures that are 20-80°C higher than those calculated at atmospheric pressure.
Bureau Hélène
Martel Carlos
No associations
LandOfFree
In situ high-pressure and high-temperature bubble growth in silicic melts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with In situ high-pressure and high-temperature bubble growth in silicic melts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In situ high-pressure and high-temperature bubble growth in silicic melts will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-953410