• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Sediment underthrusting within a continental magmatic arc: Coast Mountains batholith, British Columbia
【2h】

Sediment underthrusting within a continental magmatic arc: Coast Mountains batholith, British Columbia

机译：大陆岩浆弧内底冲作用的冲断：不列颠哥伦比亚省海岸山脉岩床

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Though continental magmatic arcs are factories for new continental crust, a significant proportion of continental arc magmas are recycled from supracrustal material. To evaluate the relative contributions of retroarc underthrusting and trench side partial sediment subduction for introducing supracrustal rocks to the middle and lower crust of continental magmatic arcs, we present results from the deeply exposed country rocks of the Coast Mountains batholith of western British Columbia. Prior work demonstrates that these rocks underwent widespread partial melting that contributed to the Coast Mountains batholith. We utilize U-Pb zircon geochronology, Sm-Nd thermochronology, and field-based studies to document the protoliths and early burial history of amphibolite and granulite-facies metasedimentary rocks in the Central Gneiss Complex. U-Pb detrital zircon data from the structurally highest sample localities yielded similar to 190Ma unimodal age peaks and suggest that retroarc rocks of the Stikine terrane constitute a substantial portion of the Central Gneiss Complex. These supracrustal rocks underwent thrust-related burial and metamorphism at >25km depths prior to similar to 80Ma. These rocks may also be underlain at the deepest exposed structural levels by Upper Cretaceous metasedimentary rocks, which may have been emplaced as a result of trench side underplating or intraarc burial. These results further our understanding of the mechanisms of material transport within the continental lithosphere along Cordilleran subduction margins.
机译：尽管大陆岩浆弧是新的大陆壳的工厂，但很大一部分大陆弧岩浆是从表壳材料中回收的。为了评估逆弧下冲断层和沟槽侧部分泥沙俯冲作用将陆壳上层岩石引入大陆岩浆弧的中，下地壳的相对贡献，我们提供了不列颠哥伦比亚省西海岸山脉岩床深部暴露的乡村岩石的结果。先前的工作表明，这些岩石经历了广泛的部分熔融，这导致了海岸山脉的岩床。我们利用U-Pb锆石年代学，Sm-Nd热年代学和野外研究来记录中片麻岩复杂的角闪石和花岗石相变质沉积岩的原岩和早期埋藏历史。来自结构最高的样品位置的U-Pb碎屑锆石数据产生了与190Ma单峰年龄峰相似的峰，表明Stikine地层的后弧岩构成了中片麻岩复合体的重要部分。这些上地壳岩石在与80Ma相似之前，在大于25 km的深度经历了与冲断有关的埋藏和变质作用。这些岩石也可能在上白垩统沉积沉积岩的最深外露构造层之下，这些沉积岩可能是由于沟槽侧的地下沉积或弧内埋藏而形成的。这些结果使我们进一步了解了沿柯迪勒俯冲带在大陆岩石圈内物质传输的机理。

著录项

相似文献

  • 外文文献
  • 中文文献
代理获取

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