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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 structural geology, a suture is a joining along a major fault zone, of separate terranes, tectonic units that have different plate tectonic, metamorphic and paleogeographic histories. The suture is often represented on the surface by an orogen or mountain range.
Pre-Jurassic rocks in western North America suspect terranes. Pacific Section of the Society of Paleontologists and Mineralogists. pp. 77– 89. Ernst, W. G. (1970). "Tectonic contact between the Franciscan Mélange and the Great Valley Sequence-Crustal expression of a Late Mesozoic Benioff Zone". Journal of Geophysical Research. 75 (5): 886 ...
Other Mesozoic terranes that accreted onto the continent include the Klamath Mountains, the Sierra Nevada, and the Guerrero super-terrane of western Mexico. [42] 80 to 90 million years ago the subducting Farallon plate split and formed the Kula Plate to the North. [32] Many of the major batholiths date from the late Cretaceous. [42]
The Canadian Shield is a collage of Archean plates and accreted juvenile arc terranes and sedimentary basins of the Proterozoic Eon that were progressively amalgamated during the interval 2.45–1.24 Ga, with the most substantial growth period occurring during the Trans-Hudson orogeny, between c. 1.90–1.80 Ga. [5] The Canadian Shield was the ...
However, in some areas from 1.16 to 1.13 Ga, coeval with extension, there is evidence there was still thrusting and emplacement of terranes occurring. [ 3 ] According to one model, westward thrusting occurred from 1.12 to 1.09 Ga and then extension was the primary tectonic activity until 1.05 Ga. [ 3 ] It was at this point that the Central ...