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This book, written by a group of internationally known experts, describes the evolution of the Pacific Ocean margins in terms of their interaction with oceanic plates. The work reflects changes in recent years in accepted views concerning the evolution of these margins. It is now thought that much of the crust of the margins may have grown through the gradual addition of discrete terranes of "foreign origin"--that is, of earth materials transported from other locations by tectonic processes. The margins discussed are those of western North America, Asia, Japan, Eastern China, Southeast Asia, New Zealand, and South America. Also reviewed are the general concepts of oceanic plateaus and transported terranes, and the past motion of the Pacific Ocean Plate.
In this Special Paper, Hildebrand and Whalen present a big-picture, paradigm-busting synthesis that examines the tectonic setting, temporal relations, and geochemistry of many plutons within Cretaceous batholithic terranes of the North American Cordillera. In addition to their compelling tectonic synthesis, they argue that most of the batholiths are not products of arc magmatism as commonly believed, but instead were formed by slab failure during and after collision. They show that slab window and Precambrian TTG suites share many geochemical similarities with Cretaceous slab failure rocks. Geochemical and isotopic data indicate that the slab failure magmas were derived dominantly from the mantle and thus have been one of the largest contributors to growth of continental crust. The authors also note that slab failure plutons emplaced into the epizone are commonly associated with Cu-Au porphyries, as well as Li-Cs-Ta pegmatites.