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首页> 外文期刊>Journal of Asian earth sciences >Structural and rheological features of the western Liaoning metamorphic core complex corridor: Indications for Late Mesozoic extension of the eastern North China Craton
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Structural and rheological features of the western Liaoning metamorphic core complex corridor: Indications for Late Mesozoic extension of the eastern North China Craton

机译：辽西变质核心复合体走廊的结构和流变特征：华北克拉通东部中生代晚期的指示

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摘要

The Xingcheng-Taili ductile shear zone and Yiwulushan metamorphic core complex formed during crustal extension of the eastern North China Craton. The ENE-trending Xingchegn-Taili sinistral ductile shear zone developed along the margins of the western Liaoning metamorphic core complex corridor within upper greenschist to lower amphibolite facies-grade metamorphic conditions. Shearing was associated with two different ductile deformation events in the Yiwulushan metamorphic core complex, i.e. (1) an earlier dextral shearing and (2) later sinistral shearing. The earlier dextral ductile shear zone is mainly characterized by simple-shear dominated general shear with L = S and LS tectonites under upper greenschist to lower amphibolite facies conditions. The orientation and fabrics of L = S tectonites indicate that the later ductile deformation consists of almost equally simple and pure shear and constrains a low-middle-temperature sinistral shear within upper greenschist fades-grade conditions. The estimation of rock rheological parameters from dynamically recrystallized grain sizes of quartz indicates that the high-temperature shear zone has formed under lower stress conditions and higher strain rates, while opposite features exist in the lower temperature shear zone. The initiation of deformation of the western Liaoning metamorphic core complex corridor might have started between 136 Ma and 120 Ma and its termination time was at ca. 100 Ma. The NE-ENE strike-slip ductile deformation in the western Liaoning metamorphic core complex corridor, within the Eastern Block of the North China Craton, was resulted from roll-back of the subducting Pacific plate beneath the North China Craton along the eastern Asian margin during Early Cretaceous times. (C) 2017 Elsevier Ltd. All rights reserved.
机译：华北克拉通东部地壳伸展过程中形成的兴城-泰力韧性剪切带和伊屋鲁山变质岩心复合体。 ENE趋势的Xingchegn-Taili窦性延性剪切带沿着辽西西部变质岩芯复杂复合体走廊的边缘向上部绿岩内发展，形成了较低的角闪岩相级变质条件。剪力与义乌鲁山变质岩心复合体中的两种不同的韧性变形事件有关，即（1）较早的右旋剪切和（2）较后的鼻窦剪切。早期右旋延性剪切带的主要特征是，在上绿片岩至下闪石相的条件下，以L = S和LS的简单剪切为主的普通剪切。 L = S膨润土的取向和结构表明，后期的韧性变形几乎等同于简单而纯的剪切，并在较高的格林斯蒂斯特褪色等级条件下限制了中低温的左旋剪切。从石英的动态再结晶晶粒尺寸估计岩石流变参数表明，高温剪切带是在较低的应力条件和较高的应变速率下形成的，而在较低温度的剪切带中则存在相反的特征。辽宁西部变质岩心复合走廊的变形始于136 Ma至120 Ma之间，终止时间大约为。 100毫安华北克拉通东段内辽西西部变质岩心复合走廊中的NE-ENE走滑延性变形，是由于华北克拉通下方俯冲太平洋板块沿东亚边缘回旋所致。白垩纪早期。 （C）2017 Elsevier Ltd.保留所有权利。

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