Accreted Terranes May Originally Have Been Which of the Following

Determine which of the named terranes accreted earliest to North America. This speculation would best be.

Convergent Plate Boundaries Accreted Terranes Geology U S National Park Service

The geographical regions that eventually become accreted allochthonous terranes include island arcs oceanic plateaus submarine ridges seamounts continental fragments and microcontinents.

. The accreted terranes that form Alaska are only some of the vast number of terranes that have added to the mass of western North America over the past 200 million years. Through the Mesozoic and Paleocene 25057 Ma terranes were accreted to the continental margin resulting in large-scale contraction and intense metamorphism plutonism and uplift. Accreted terranes may be called exotic terranes suspect terranes or tectonostratigraphic terranes.

A look at what is carried on the plates in todays Pacific Ocean basin gives some idea of the types of rock most likely to have accreted to North America in the past. The terms all mean the same thing. What are the different types of terranes and what are their characteristics.

The western side of Idaho preserves some of these tectonic fragments the Blue Mountains terranes and the collision zone along which they were sutured to the North American continent in late. 1 the dismembered oceanic crust terrane or melange 2 the Wallowa Mountains-Seven Devils Mountains volcanic arc terrane 3 the Juniper Mountain-Cuddy Mountain volcanic arc terrane may be a southern extension of the Wallowa-Seven Devils volcanic arc and 4 Jurassic Flysch terrane of. The two most likely types of terranes are sections oceanic crust and entire island arcs.

Accreted terranes along modern subduction plate boundaries include the Nankai accretionary complex of Japan subduction of the Philippine Plate beneath the Eurasian Plate the Barbados Ridge in the Caribbean subduction of the Caribbean Plate beneath the North American Plate and the Mediterranean Ridge subduction of the African Plate beneath the Eurasian Plate. The terms all mean the same thing. The margins of many continents have grown through the accretion of terranes.

They have speculated that there may be life elsewhere in the cosmos. The oceanic and island arc terrane is divided into four smaller terranes. Identify the type of deformation the rock has been exposed to.

The array of terranes can be traced from National Park Service sites in Alaska southward through British Columbia North Cascades and Olympic national parks in Washington State and to. A ________ is a crustal fragment that has been transported by plate tectonics and has adhered to. The resulting structures observed today are divided into five subparallel geomorphological belts Figure 2.

The word terrane with its distinctive spelling is technically a tectonostratigraphic terrane a piece of the earths crust or lithosphere that has been accreted to the edge of one tectonic. Also likely are oceanic plateaus broad zones. Paleomagnetic evidence suggests that this Cuyania terrane is of Laurentian origin and it has been hypothesized that the terrane may have been a plateau attached to Laurentia which was involved in the Cambrian rifting event and later accreted during.

A broad swath of the present continental margin is underlain by rocks of these accreted terranes that have diverse origins as Paleozoic-Mesozoic crustal fragments from the ancestral Pacific.

Accreted Terranes Geologictimepics

Terrane Accretion Lecture Pnw Topic 7 Media Up

Accreted Terranes Geologictimepics