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A tectonostratigraphic terrane is a fault-bounded package of rocks of at least regional extent characterized by a geologic history that differs from that of neighboring terranes. The essential characteristic of these terranes is that the present spatial relations are incompatible with the inferred geologic histories.
A complex fault system, known as the Border Ranges Fault, is the modern expression of the suture zone between Wrangellia and Chugach Terranes. Over time, plate tectonics moved this amalgamation of crust generally northeastward into contact with the North American continental margin.
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In addition to the related terranes of the Carolina Zone, the Carolina Terrane is adjacent to several possibly-unrelated terranes, including: Cat Square Terrane. a strip of metamorphosed sedimentary rocks east of the Tugaloo Terrane. These rocks were likely deposited as greywackes and pelites between 430 and ~380 million years ago.
"Avalonia" can thus refer exclusively to rocks in Newfoundland (Avalonia sensu stricto), an assembly of terranes, or a single tectonic unit. [ 1 ] Avalonia is the largest of the peri-Gondwanan terranes, a series of continental blocks that more or less simultaneously broke off the margins of the southern supercontinent Gondwana and therefore ...
The continental crust on the downgoing plate is deeply subducted as part of the downgoing plate during collision, defined as buoyant crust entering a subduction zone. An unknown proportion of subducted continental crust returns to the surface as ultra-high pressure (UHP) metamorphic terranes, which contain metamorphic coesite and/or diamond plus or minus unusual silicon-rich garnets and/or ...
At the boundary between these two terranes is the Esk Head Belt, an 11-kilometre (6.8 mi) wide mélange of broken and deformed rocks. The Aspiring terrane (Aspiring lithologic association) is officially included within the Torlesse composite terrane; however, it has a higher proportion of igneous rocks and a different sedimentary source. [ 3 ]
The Cymru terrane is one of five inferred fault bounded terranes that make up the basement rocks of the southern United Kingdom. The other notable geological terranes are the Charnwood, Fenland, Wrekin and the Monian Composite terranes. [1]