首页> 外文期刊>International Geology Review >Dunk, Dunkless and Re-dunk Tectonics: A Model for Metamorphism, Lack of Metamorphism, and Repeated Metamorphism of HP/UHP Terranes
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Dunk, Dunkless and Re-dunk Tectonics: A Model for Metamorphism, Lack of Metamorphism, and Repeated Metamorphism of HP/UHP Terranes

机译:扣篮,扣篮和再扣篮构造学:HP / UHP地形变质,缺乏变质和重复变质的模型

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摘要

High-pressure metamorphic terranes form when slivers of continental crust are pulled into the mantle by previously subducted oceanic lithosphere. Old, cold lithosphere subducts into the mantle at steep angles, dragging sialic crust to deep levels, quickly followed by steep, rapid exhumation. Young thin lithosphere subducts at shallow angles, pulling crustal slabs slowly into the shallow mantle, followed by slow exhumation, retrogression, and melting. Terranes that follow inboard-dipping subduction zones will subduct once, and will be overprinted by subsequent subduction and collisions. Terranes above outboard-facing subduction zones will be underthrusl by the continental margin. Subsequent collisions will result in the re-subduction of an increasingly complex continental margin characterized by previously accreted terranes.
机译:当大陆壳条被先前俯冲的海洋岩石圈拉入地幔时,形成高压变质地层。寒冷的旧岩石圈以陡峭的角度俯冲到地幔中,将唾液结皮拖到深层,然后迅速陡峭地发掘。年轻的薄岩石圈以浅角度俯冲,将地壳平板缓慢拉入浅层地幔,随后缓慢回火,倒退和融化。沿船内俯冲俯冲带运动的地层将俯冲一次,随后的俯冲和碰撞将套印。外侧俯冲带上方的地层将被大陆边缘穿过。随后的碰撞将导致重新俯冲以大陆先前为特征的日益复杂的大陆边缘。

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