Information AboutTerrane |
| CATEGORIES ABOUT TERRANE | |
| plate tectonics | |
| SHOPPER'S DELIGHT | |
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The concept of ''terranes'' developed from studies in the 1970s of the complicated Western or Canadian Cordillera n ("backbone") Orogenic margin of North America, a virtual geological lasagna that had remained an inexplicable Irreducible Complexity , until the new science of plate tectonics illuminated the ability of crustal fragments to "drift" thousands of miles from their origin and fetch up, crumpled, against an exotic shore. Such terranes are dubbed accreted terranes by geologists. "It was soon determined that these exotic crustal slices had in fact originated as "suspect terranes" in regions at some considerable remove, frequently by thousands of kilometers, from the orogenic belt where they had eventually ended up. It followed that the present orogenic belt was itself an accretionary collage, composed of numerous terranes derived from around the circum-Pacific region and now ‘welded’ together along major faults. These concepts were soon applied to other, older orogenic belts, e.g. the Appalachian belt of North America.... Support for the new hypothesis came not only from structural and lithological studies, but also from studies of faunal biodiversity and palaeomagnetism. For an example of a ''terrane'', see Avalonia . See also Geology Of Victoria EXTERNAL LINKS
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