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In geology, a terrane (/ t ə ˈ r eɪ n, ˈ t ɛr eɪ n /; [1] [2] 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. The crustal block or fragment preserves its distinctive geologic history, which is different from the ...
The Yakutat Terrane is currently colliding with the continental margin below the central Gulf of Alaska. During the Neogene the terrane's western part was subducted after which a sediment wedge accreted along the northeast Aleutian Trench. This wedge incorporates sediment eroded from the continental margin and marine sediments carried into the ...
The Wrekin Terrane is bounded to the west by the Welsh Borderland Fault System and to the east by the Malvern Lineament. The geological terrane to the west is the Cymru Terrane and to the east is Charnwood Terrane. [1] The majority of rocks in the area are associated with the outcrops that are evident at the faulted boundaries. [2]
In geology, accretion is a process by which material is added to a tectonic plate at a subduction zone, frequently on the edge of existing continental landmasses. The added material may be sediment, volcanic arcs, seamounts, oceanic crust or other igneous features. [1] [2] [3]
The Yukon–Tanana Upland is a physiographic province mostly underlain by rocks of the Yukon–Tanana terrane. [2] Understanding and definition of the YTT is constantly progressing, the term "Yukon Tanana composite terrane" or "YTCT" is used by some workers, reflecting the disparate depositional and tectonic histories being recognized in rock ...
When mapping the metamorphic grade of a terrane, a geologist has to take the lithology of the rock in account. Lithologies are mainly dependent on the protolith, the original rock before metamorphism. The main lithologies are ultramafic, mafic, felsic (or quartzo-feldspathic), pelitic and calcareous. In all of these (and other) lithologies ...
The geological terrane to the west is the Monian Composite terrane and to the east is Wrekin terrane. [1] The majority of rocks in the area are associated with the outcrops that are evident at the faulted boundaries. [2] [3] The Proterozoic rocks of the Cymru terrane are typified in North Wales by the Arfon Group, Sarn Complex and the Twt Hill ...
If there are folds, these are numbered as F 1, F 2, etc. Generally the axial plane foliation or cleavage of a fold is created during folding, and the number convention should match. For example, an F 2 fold should have an S 2 axial foliation. Deformations are numbered according to their order of formation with the letter D denoting a ...
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