Topic
Terrane
About: Terrane is a research topic. Over the lifetime, 11025 publications have been published within this topic receiving 442596 citations. The topic is also known as: tectonostratigraphic terrane.
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TL;DR: The juxtaposition of disparate geologic terranes in southern Alaska has been previously interpreted to be mainly the result of several hundred kilometers of right lateral offset along the Denali fault system in Cenozoic time as mentioned in this paper.
Abstract: The juxtaposition of disparate geologic terranes in southern Alaska has been previously interpreted to be mainly the result of several hundred kilometers of right lateral offset along the Denali fault system in Cenozoic time Recent geologic investigations in the Healy quadrangle strongly suggest that Cenozoic horizontal displacements of such magnitude along the Denali fault system do not exist In the Healy quadrangle, isograds and metamorphic facies boundaries of an early Late Cretaceous metamorphic belt trend across the Cenozoic McKinley strand of the Denali system without significant horizontal offsets The present geologic makeup of most of southern Alaska is primarily the result of the Talkeetna superterrane, consisting of the previously assembled Peninsular terrane and Wrangellia, colliding with and subsequently being thrust upon the Yukon-Tanana and Nixon Fork terranes of the ancient North American continent in about middle Cretaceous time The leading edge of the Talkeetna superterrane faces a wide, complexly deformed zone that contains numerous northwestward thrust miniterranes tectonically intermixed with Jurassic and Cretaceous flysch The flysch is interpreted to have been deposited mostly in the narrowing and subsequently collapsed oceanic basin between the converging continental blocks The postcollisional Denali fault system developed in Cenozoic time across the already accreted continental margin, in eastern Alaska along an older, Cretaceous suture
124 citations
TL;DR: In this article, six geodynamic processes can be envisioned to have carried continental metamorphic terranes to mantle depths: continental margin subduction, micro-continent subduction and sediment subduction.
124 citations
TL;DR: In this article, the authors show that the central and northern parts of the Cordillera Occidental of the Andes of Ecuador comprise two terranes, the older terrane consisting of an early to late (?) Cretaceous oceanic plateau suite, and the younger terrane consists of a volcanosedimentary island arc sequence, derived from a basaltic to andesitic source.
124 citations
TL;DR: In this article, three Pan-African hypersthene-bearing monzogranitic and quartz-monzonitic plutons from the Eastern terrane of Nigeria have been investigated in detail.
124 citations
TL;DR: A systematic record of sense-of-shear criteria associated with peak conditions of amphibolite facies metamorphism from the Central Rhodope massif, Bulgaria, gives evidence for superposition of two distinct terranes as discussed by the authors.
Abstract: A systematic record of sense-of-shear criteria associated with peak conditions of amphibolite facies metamorphism from the Central Rhodope massif, Bulgaria, gives evidence for superposition of two distinct terranes. The lower terrane is characterized by south-vergent, flat-lying thrusting that involved eclogites. The upper terrane is characterized by east-vergent, flat-lying shearing possibly associated with crustal extension. We suggest that both regional metamorphism and deformation may be Cretaceous in age. There was erosion prior to emplacement of several crystalline sheets at shallow depths during the early Cenozoic. This was followed by Oligocene extension and rhyolitic volcanism. The Rhodope massif can no longer be regarded as a stable Paleozoic or older microcontinent.
124 citations