Definition of AMCG

AMCG suite occurs predominantly in the Adirondack Highlands

and central granulite terrain of the Canadian Grenville

province. Though highly deformed, the AMCG suite has been

characterized as igneous in origin based on the presence of

relict igneous textures. Several geologists, pioneered by Jim

McLelland, have suggested that the post-collisional delamination

of the subcontinental lithospheric mantle generated gabbroic

melts that ponded at the mantle-crust boundary. This

ponding would have provided a significant source of heat,

thereby affecting the lower crust in two ways: it created melts

in the lower crust, thus producing a second generation of

more felsic magma. This model is supported by the bimodal

nature of the AMCG suite. The second effect was weakening

of the crust, which provided a conduit for the hot, less dense

magmas to ascend to the surface. This hypothetical emplacement

model is supported by the AMCG suite’s anhydrous

nature in conjunction with the shallow crustal levels the

magma has invaded.

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