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首页> 外文期刊>Journal of geodynamics >Exhumed Himalayan-type syntaxis in the Grenville orogen, northeastern Laurentia
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Exhumed Himalayan-type syntaxis in the Grenville orogen, northeastern Laurentia

机译：劳伦西亚东北部格伦维尔造山带出土的喜马拉雅型语法

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A deep-seated analog of the syntaxis developed in the Tibetan Plateau occurs in the Grenville Orogen of eastern Laurentia, During the final assembly of Rodinia, Amazonia collided with Laurentia and produced a series of large, conjugate, transcurrent, shear systems and pervasive strike-slip deformation that overprinted compressional structures related to the Ottawan Orogeny (the last orogenic phase of what is considered Grenvillian). A northeast-striking dextral system at least 35-km wide developed in the Reading Prong of New York (locally known as the Hudson Highlands), New Jersey, and Pennsylvania. U-Pb SHRIMP zircon geochronology and Ar/Ar thermochronology on the lowest grade cataclasites constrain the age of movement between 1008 and 876 Ma. A 60-km-wide, east-west striking, sinistral shear system developed across the central Adirondack Highlands. This system overprints rocks with granulite-facies metamorphic assemblages containing ca. 1050 Ma metamorphic zircons and is cut by a swarm of 950 Ma leucogranites. The timing, geometric relationships, and shear sense of the Adirondacks and Reading Prong shear systems suggest a conjugate system within a syntaxis with bulk compression directed ENE-WSW. This tectonic scenario invokes a component of strike-parallel deformation during the Ottawan Orogeny and provides a kinematic mechanism for an otherwise enigmatic, synchronous, late (ca. 930 Ma) exten-sional event including the Carthage-Colton mylonite zone in the northwest Adirondacks and Canada.
机译：在青藏高原开发的语法的深层类似物出现在劳伦西亚东部的格伦维尔造山带。在罗迪尼亚的最后组装期间，亚马逊河与劳伦西亚发生碰撞，产生了一系列大型的，共轭的，横流的，剪切系统和无处不在的罢工，滑移变形叠印了与渥太华造山带有关的压缩结构（被认为是格伦维连的最后一个造山阶段）。在纽约的雷丁五爪（在当地被称为哈德逊高地），新泽西州和宾夕法尼亚州，开发了一个东北激进的右旋系统，其宽度至少为35公里。最低品位的白云母的U-Pb SHRIMP锆石年代学和Ar / Ar热年代学将移动年龄限制在1008至876 Ma之间。横跨中部阿迪朗达克高地发展了一个60公里宽的东西向冲击式左旋剪切系统。该系统用含钙的花岗石相变质组合覆盖岩石。 1050 Ma的变质锆石，由950 Ma的白垩纪花岗岩切割而成。 Adirondacks和Reading Prong剪切系统的时间，几何关系和剪切方向表明，语法内的共轭系统具有大体积压缩定向ENE-WSW。这种构造情景在渥太华造山运动中引起了走向平行变形的成分，并为其他神秘的，同步的，晚期的（约930 Ma）延展事件提供了运动学机制，包括西北阿迪朗达克山脉和迦太基-科尔顿的镍铁矿带。加拿大。

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