The very low manufacturing rates for new CRT worldwide now mean that recycling theglass back into CRTs is no longer an option, and the only alternatives to avoid landfill have been to use the glass as asmelting flux (85% of it remains as a toxic slag), or using foundry temperatures (1000AC) melt extraction
for the lead, whichis extremely energy and CO2 costly, and at best produces an 80% co-stream of low value glass.
Since in our model melt escapes from the source before a percolation threshold or 'critical melt percentage' (Arzi 1978) has been reached, melt extraction starts at an earlier stage than in conventional models of granite petrogenesis.
The present model can take into account the effects of different rates of melt extraction and accumulation on magma chemistry and may quantitatively contribute to the understanding of the relationship between tectonic environment and granite chemistry in contrast to static models applied previously.
depleted by a previous melt extraction
event (low degree [1-2[degrees]/0] partial melts; Hofmann 1988).
1990: Incompatible element and isotopic evidence for tectonic control of source mixing and melt extraction
along the Central American arc.
Several types of melt extraction feature can be observed in the mantle section of an ophiolite located in Oman.
All of these processes may operate - in different times and places - and it is not yet clear which are dominant in melt extraction from the mantle beneath oceanic spreading ridges.
Partial melting and melt extraction
from its source rock is the main way of magma generation in the Earth's crust.
This suggests that metasomatic fluids or melts carry large ion lithophile elements to their sources a short time prior to melt extraction
Determinations of trace-element abundances in olivine-hosted meat inclusions--droplets of melt less than 1 millimeter across entrapped in olivine crystals as beads of glass--provided important clues that place the depths of melting and melt extraction
at greater than 80 kilometers.