Download North American Continent-Ocean Transects Program by National Research Council, Division on Engineering and PDF
By National Research Council, Division on Engineering and Physical Sciences, Mathematics, and Applications Commission on Physical Sciences, Board on Earth Sciences and Resources, U.S. Geodynamics Committee
U.S. Geodynamics Committee, Board on the earth Sciences and assets, arithmetic, and functions fee on actual Sciences, department on Engineering and actual Sciences, nationwide learn Council
This publication discusses the result of the transects software, which consists of compilations of maps and go sections displaying geological, geophysical, and geochemical facts and interpretations alongside 23 transects from the continental craton to the oceanic lithosphere round North the United States. The publication includes sections, an summary and a collection of options for this system and synopses, findings, and difficulties linked to the 23 transects.
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Extra resources for North American Continent-Ocean Transects Program
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Conceptual mechanisms for removal of Precambrian material are rifting and plucking out of chunks of the edge of North America during oblique convergence (as with Baja California) and subduction during collision, with loss via sinking of a detached slab, and/or by melting. A complete history of the changes should incorporate times, places, and tectonics of removal of fragments of Precambrian North America. Another basic question is how far south (into what is now Mexico) Precambrian North America once extended and how this continental salient, if it existed, related to the confluence of the Appalachian and Cordilleran orogenic belts in northern Mexico.
What are the protoliths? What are the age and age variability of the boundary, and is it a continually evolving surface or one that forms mainly during or before major tectonic events? What is the material flux across the Moho? )? What are the origins and transport paths of lower crustal rock—mainly from the surface, underplating, the mantle, or from primeval processes (autochthonous)? 3. Absolute Chronology of Tectonic Events The times of major events in the evolution of North American continent-ocean transitions are generally known to the first order.
What were the vertical and horizontal motions that brought these belts to their current positions, and what tectonics caused the motions? There are many hypotheses for such metamorphic rocks: (a) roots of magmatic arcs exposed by deep erosion, (b) suture-generated rocks in zones of thickened crust, (c) nappes of either North American continental basement or collided continents, and (d) unroofed regions of large crustal extension. By far the most widespread development of Phanerozoic metamorphic rocks now exposed in the North American continent is in the Appalachian mountain system.