The Kinetics of Silica Dissolution from Volcanic Glass in the Marine Environment.
Abstract
The rate of silica dissolution from volcanic glass in seawater and NaCl solutions can be described by a combination of simultaneous first order reactions. Models that contain parabolic-rate diffusion processes did not agree with these data. Laboratory experiments studied the silica dissolution rate from one rhyolitic and two basaltic glasses in the pH range of 7.3 to 8.3 and at temperatures of 25, 60, and 90 C. The early flux of silica from these samples was greatest for the basaltic reticulite pumice, less for the basaltic hyaloclastite glass, and least for the rhyolitic obsidian. Seawater collected adjacent to a basaltic lava flow as it entered the ocean was enriched in silica, iron, and manganese; but cobalt, copper, nickel, lead, chromium, and zinc concentrations were not significantly different from the control samples.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1975
- Accession Number
- ADA027593
Entities
People
- Glenn Charles Sicks