Abstract
The Red Hill intrusive complex in the towns of Moultonboro and Sandwich, New Hampshire is a small elliptical stock of syenite, feldspathoidal syenite, and granite. It is divided into three distinct intrusive groups which are, from oldest to youngest, the Older Quartzose Group consisting of slightly oversaturated syenites occupying the crescent-shaped northwestern part of the intrusive, the Feldspathoidal Group consisting of undersaturated nepheline- and sodalite-bearing syenites which form a funnel-shaped intrusive body and a swarm of ring dikes or cone sheets, and the Younger Quartzose Group consisting of oversaturated syenites and granite occurring as crosscutting plugs. The compositions and textures of the Feldspathoidal Group rocks are believed to be the result of the intrusion of magma intermittently tapped from a subjacent body of fractionally crystallizing slightly undersaturated, chloride-rich syenitic magma. All the Feldspathoidal Group rocks cooled together under closed-system conditions, local equilibrium being maintained down to about 250° C. These rocks solidified at a depth of less than 6 or 7 km.
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