applied to a complex of related carbonate and silicate rocks in a magmatic or extrusive complex. Primary...nephelinite, ijolite, melilitolite, aillikite, nepheline syenite, liquid immiscibility, carbothermal residue, upper...for the carbonate-bearing rocks found in these alkaline complexes. Not everyone agreed with this concept;...(Shand 1943) for the genesis of undersaturated alkaline rocks, and the work ushered in a decade of renewed...calcite carbonatite such as are found at the Fen complex. In fact, the genetic questions highlighted by |