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The Tertiary I-type calcalkaline granitoids of Papua New Guinea occur within three structural-tectonic zones; island arc, continental orogenic, and cratonic. Preliminary data indicate that the granitoids of one zone are not distinct from those of any other, but that within any one zone there are large variations in textures and composition, a predominance of basic and intermediate rock types, examples of comagmatic volcanics, and porphyry Cu-Au mineralization. The similarities among the three zones indicate a common origin. Underplating with mantle-derived magmas during a subduction event provides a common source material; however, partial melting at the base of the crust to produce the granitoids could result from subduction, crustal thickening, or crustal buckling.

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