Experimental seawater-basaltic glass interaction at 50°C: Study of early developed phases by electron microscopy and X-ray photoelectron spectrometry

Details Experimental seawater-basaltic glass interaction at 50°C: Study of early developed phases by electron microscopy and X-ray photoelectron spectrometry Experimental seawater-basaltic glass interaction at 50°C: Study of early developed phases by electron microscopy and X-ray photoelectron spectrometry

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..377c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 3, pp.377-387

Computer Science

12

Scientific paper

Experiments on seawater-basaltic glass interaction were made using a particulary high seawater-basaltic glass ratio (14.5 g/cm 2 ; weight ratio: 50). A layered alteration skin is observed at the glass surface, while the variations in the composition of the seawater are imperceptible. Three zones of different composition and structure are distinguished: 1. 1) An external zone, the composition of which evolved to saponite. 2. 2) A median zone of hydrotalcite-like hydroxycarbonate (Mg 6 Al 2 CO 3 (OH) 16 4H 2 O). 3. 3) An internal zone, between glass and hydroxycarbonates, richer in Fe and in Mg and in which a 10 Å interval is observed (by dark field examination) compatible with a TOT type clay mineral. The composition of this zone indicates a mixing of poorly crystalline products. The principal chemical exchanges between glass and solution are the release of Ca in solution and the contribution of Mg and CO 2 from seawater to form hydroxycarbonates, which are considered precursors of phyllosilicates. Comparison with natural phenomena (palagonitization) is made.

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