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By Robert B. Miller, Arthur W. Snoke

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Extra info for Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes (GSA Special Paper 456)

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1. , Exhumation processes: Normal faulting, ductile flow and erosion: Geological Society of London Special Publication 154, p. 305–323. , 1976, The Ivrea-Verbano and Strona-Ceneri zones, northern Italy: A cross-section of the continental crust—New evidence from seismic velocities: Tectonophysics, v. 33, p. 1016/00401951(76)90054-8. , American Geophysical Union, Geodynamic Series 14, p. 1–7. , American Geophysical Union Monogram, v. 51, p. 287–299. , 1981, Exposed cross-sections through the continental crust: Implications for crustal structure, petrology and evolution: Earth and Planetary Science Letters, v.

2003). The Cretaceous granitic rocks form an intimate intrusive network in the lower Paleozoic to Neoproterozoic calcareous, quartzitic, and pelitic host rocks. Even where granitic rocks greatly predominate, metasedimentary rafts form a ghost stratigraphy that traces large-scale, coherent folds (Howard, 1966, 1980, 1987, 2000). Tertiary plutonic rocks in the Ruby–East Humboldt core complex can be subdivided into two age groups: ca. 40–36 Ma (late Eocene) and ca. 29 Ma (late Oligocene). The largest of the late Eocene intrusions is the ~140-km2, ca.

High-pressure assemblages are exposed in the deep levels of parts of the attenuated Betic Cordillera crustal section; this section apparently records a low geothermal gradient on the basis of the presence of blueschist- and eclogite-facies metabasic rocks and high-pressure metapelitic rocks. The Phanerozoic sections highlighted in this volume display a range of crustal thicknesses, which reflects the different tectonic settings in which the sections evolved. It is difficult to evaluate the syn-orogenic crustal thicknesses of these sections, as this crust inherently is not static.

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