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The nature of petrologic and structural properties and processes that characterize the middle and lower continental crust is a long-standing problem in the earth sciences. During the past several decades significant progress has been made on this fundamental problem by synthesizing deep-crustal seismic-reflection imaging, laboratory-based seismic-velocity determinations, xenolith studies, and detailed geologic studies of exposed crustal cross sections. Geological, geochemical, and geophysical studies of crustal sections provide a crustal-scale context for a variety of important problems in the earth sciences. Crustal sections are widely used to evaluate crustal composition and petrogenesis, including lateral and vertical variations in rock types. Evidence...

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