Abstract
Previous interpretations relating to precipitation of anorthoclase megacrysts from alkaline basaltic magmas under high-pressure conditions are contradicted. It is proposed that these feldspars were crystallized above the solvus from hydrous melts at shallow depths, under low-pressure equilibrium conditions. These melts had been considerably enriched with volatiles of sodium, strontium, and barium, and to some extent also of rubidium.
| Original language | English GB |
|---|---|
| Pages (from-to) | 287-291 |
| Journal | Mineralogical Magazine |
| Volume | 43 |
| Issue number | 326 |
| DOIs | |
| State | Published - 2018 |