...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geodynamics >Spatial and temporal links between shawinigan accretionary orogenesis and massif anorthosite intrusion, southern grenville province, New York, U.S.A.
【24h】

Spatial and temporal links between shawinigan accretionary orogenesis and massif anorthosite intrusion, southern grenville province, New York, U.S.A.

机译：美国纽约州南格林维尔省Shawinigan增生造山运动与断层块原位侵入之间的时空联系。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Synthesis of new and existing field, structural, geochemical, isotopic, and geochronologlc data in the Adirondack Highlands of the southern Grenville Province indicate a suite of arc plutonic rocks (Piseco Lake granite suite) was intruded into basement rocks from ca. 1205-1180 Ma due to northward subduction beneath the Laurentian margin. Although rocks of similar age and origin are found in the Adirondack Lowlands and elsewhere in the Highlands, they occur in the greatest volume and are most intensely deformed in the Piseco Lake Shear Zone (PLSZ). This structure separates the Adirondack Highlands from ca. 1350-1300 Ma tonalitic gneisses in the southern Adirondacks. Tectonites in the PLSZ record the deformation of a continental arc batholith during collision with an outboard terrane which was accreted to Laurentia during the Shawinigan Orogeny. Internal to the PLSZ, a 10-15 km wide, subvertical zone of subhorizontally lineated L-S and L-tectonites (Piseco Lake gneisses) was derived primarily from megacrystic arc plutonic protoliths and documents sinistral relative motion. Intrusion of the arc granitoids, deformation and anatexis (ca. 1180-1160 Ma) throughout the entire Adirondack region immediately preceded and overlapped the intrusion of the anorthosite-mangerite-charnockite-granite (AMCG) suite at ca. 1165-1145 Ma in the Adirondack Highlands. We hypothesize that delamination or slab detachment, in combination with an irregular Laurentian margin, triggered disruption of the underlying lithosphere, allowed ascent of enriched asthenosphere, and facilitated the intrusion of voluminous AMCG rocks in the Adirondacks north of the PLSZ. Other large anorthosite massif complexes in the southern Grenville Province, including the Morin and Lac St. Jean bodies near the Laurentian margin, have also been linked to Shawinigan convergent structures and were an important part of accretionary processes documented in the Grenville Orogen.
机译：格伦维尔省南部阿迪朗达克高地新的和现有的野外，结构，地球化学，同位素和地球年代学数据的综合表明，一组弧形的深部岩石（Piseco Lake花岗石套件）被侵入到约20世纪20年代的基底岩中。 1205-1180 Ma是由于在Laurentian边缘之下向北俯冲。尽管在阿迪朗达克低地和高地的其他地方发现了相似年龄和起源的岩石，但它们的体积最大，在Piseco湖剪切带（PLSZ）中变形最大。这种结构将阿迪朗达克高原与约克分开。 1350-1300年，阿迪朗达克山脉南部的马口系片麻岩。 PLSZ中的膨润土记录了与外部地形碰撞时大陆弧基岩的变形，该外部地形在Shawinigan造山运动中向Laurentia增生。在PLSZ的内部，一个10-15 km宽的，水平下衬的L-S和L-膨润土（Piseco湖片麻岩）的垂直下带主要来源于大弧弧的深部原生质岩，并记录了左旋相对运动。在整个阿迪朗达克地区，弧状花岗岩的侵入，变形和麻醉作用（约1180年至1160 Ma）紧随其后，并且与钙长石-锰铁矿-霞石-花岗岩（AMCG）的侵入相重叠。 1165年至1145年在阿迪朗达克高原的马。我们假设分层或平板脱离，加上不规则的Laurentian边缘，触发了下伏的岩石圈破裂，允许上升的软流圈上升，并促进了PLSZ北部阿迪朗达克山脉大量AMCG岩石的侵入。格伦维尔省南部的其他大型原位地块复合体，包括劳伦山脉边缘附近的莫林和圣让湖体，也与Shawinigan会聚结构有关，并且是格伦维尔造山带记录的增生过程的重要组成部分。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号