Accreted terranes are
the blocks of continental fragments and oceanic islands that have collided with a continent and are now permanently attached
. All continents, including North America, tend to be older in their interiors and grow outward over geologic time, as terranes are added to the edges of the continent.
What is a terrane quizlet geology?
What is a terrane?
a slice of lithosphere that has been added to the margin of a continent during plate collision
.
What is terrane in geography?
In geology, a terrane (in full, a tectonostratigraphic terrane) is
a crust fragment formed on a tectonic plate (or broken off from it) and accreted or “sutured” to crust lying on another plate
. … A sedimentary deposit that buries the contact of the terrane with adjacent rock is called an overlap formation.
How do you identify terrane?
One of the distinguishing features of a terrane is that
the contacts with its geological surroundings are faults
. However, the faults that separate a terrane from its surroundings can only be seen if they are exposed at the earth’s surface.
What are the three identifying characteristics of a terrane?
What are the three identifying characteristics of a terrane? (i) Each terrane has distinct rocks and fossils. (ii)
There are major faults at the boundaries of a terrane.
(iii) Magnetic properties of a terrane do not match with the neighboring terrane.
How is an accreted terrane created?
Accreted terranes are the blocks of continental fragments and oceanic islands that
have collided with a continent
and are now permanently attached. … Where plates converged, thicker crust formed at island arcs as magma poured out on the surface as lava flows, and was added to the base of the crust as igneous intrusions.
What is an exotic terrane?
An exotic terrane (not “terrain”) is
a piece of the Earth’s crust that has merged with another landmass that usually has a separate and entirely different geologic history
.
What are the four major features of a subduction zone?
- Oceanic lithosphere goes under the oceanic plate.
- Scraped sediments accumulate on upper plates.
- Igneous and metamorphic rocks form mountainous topography.
Where does most terrane accretion occur quizlet?
What is a terrane? A slice of lithosphere that has been added to the margin of a continent during plate collision. Where does most terrane accretion occur?
In association with a continental-oceanic subduction zone
.
What is the difference between Terrane and terrain?
In addition to being bounded by
faults
, terrane has a distinct stratigraphy, structure, and geologic history. Terrain, on the other hand, is a single, distinctive rock formation or an area made up mostly of a particular rock or group of rocks (WikiDif 2017).
What is the three types of boundaries?
- Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust. …
- Divergent boundaries – where two plates are moving apart. …
- Transform boundaries – where plates slide passed each other.
Where are Ophiolites found?
Ophiolites have been found in
Cyprus, New Guinea, Newfoundland, California, and Oman
. The Samail ophiolite in southeastern Oman has probably been studied in the greatest detail. The rocks probably formed in the Cretaceous not far from the what is now the Persian Gulf.
What is a suspect terrane?
Suspect terrane is
a mass of fault block of crustal dimensions in which the original position is questionable with respect to the adjacent terrane
or stable continental land mass to which it is presently attached. Boundaries of suspect terranes are always faults.
Which features are associated with divergent boundaries?
Effects that are found at a divergent boundary between oceanic plates include: a
submarine mountain range such
as the Mid-Atlantic Ridge; volcanic activity in the form of fissure eruptions; shallow earthquake activity; creation of new seafloor and a widening ocean basin.
How do geologists likely identify a terrane?
How do geologists likely identify a terrane? …
When a terrane is scraped off a sinking plate, it is put under a lot of pressure.
The pressure makes the rock crack.
The western Superior Craton is
formed by different terranes stitching with each other continuously
during the Neoarchean period. … For these accretions, the North Caribou Terrane acted as the accretion nuclei onto which other terranes dock on its northern and southern side.
