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Such terranes were dubbed "accreted terranes" by geologists. Geologist J. N. Carney writes: It was soon determined that these exotic crustal slices had in fact originated as "suspect terranes" in regions at some considerable remove, frequently thousands of kilometers, from the orogenic belt where they had eventually
Most continents are composed of multiple accreted "terranes", pieces of low-density continental crust with different origins. For example, North America is made up of multiple accreted terranes that collided with the Laurentian proto-continent, such as the Proterozoic Yavapai, Mazatzal, and Grenville Province Terranes. [5]
It was later accreted to the continental margin of Laurasia. [ 4 ] Longitudinal sedimentary tapering of pre-orogenic sediments correlates strongly with curvature of the submarine frontal accretionary belt in the South China Sea margin, suggesting that pre-orogenic sediment thickness is the major control on the geometry of frontal structures.
Geophysical studies in the region discovered a large subsurface structure along the northern Patagonian border, which cuts off the suture boundaries between the Rio de la Plata craton and its westward accreted terranes. This feature has been hypothesized as representing the suture zone of Patagonia with Gondwana.
"The Falkland Islands: New paleomagnetic data and their origin as a displaced terrane from Southern Africa". In: Deep structure and past kinematics of accreted terranes , ed. J.W. Hillhouse, (AGU Monograph 50), 59–72.
Geologic map depicting the Smartville Complex (in brown) and other accreted terranes in California. [1]The Smartville Block, also called the Smartville Ophiolite, Smartville Complex, or Smartville Intrusive Complex, is a geologic terrane formed in the ocean from a volcanic island arc that was accreted onto the North American Plate during the late Jurassic (~160–150 million years ago).
The Acadian orogeny resulted from oblique convergence or major transcurrent movement along a large strike-slip fault which represents the zone of convergence between Laurussia/Laurentia and Avalon terranes. [4] One or more of the Avalonian terranes accreted with the eastern margin of Laurentia, most likely beginning in the late Early Devonian. [9]
The latter stages of orogenesis, in contrast, saw multiple oceanic arc terranes accreted onto the western margin of North America in a "Cordilleran type" accretionary orogen. [2] Deformation related to the accretion of these volcanic arc terranes is mostly limited to the western regions of the resulting mountain ranges ( Klamath Mountain range ...