...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of the Geological Society >Grampian orogenesis and the development of blueschist-facies metamorphism in western Ireland
【24h】

Grampian orogenesis and the development of blueschist-facies metamorphism in western Ireland

机译：爱尔兰西部格兰邦造山运动与蓝片岩相变质作用的发展

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

Rb–Sr and 40Ar/39Ar step-heating and in situ 40Ar/39Ar laserprobe dating of fabric-forming micas provide new constraints on the timing of Grampian orogenesis and the associated development of blueschist-facies metamorphism at the Laurentian margin in NW Ireland. Early (MP1) blueschist-facies assemblages were developed in metabasites of the Dalradian Supergroup deposited near the edge of the incipient Laurentian margin, contemporaneous with Barrovian metamorphism in the Dalradian closer to the Laurentian foreland. The regional D2 event is associated with the formation of orogen-scale fold nappes and is constrained in the Dalradian by S2 muscovite ages of c. 460 Ma, which are probably recording crystallization. Importantly, the Clew Bay Complex, previously considered as an exotic terrane (correlated with the Highland Border Complex of Scotland) and the Dalradian are in structural continuity. Muscovite from the S2 nappe fabric in the Clew Bay Complex also yields identical c. 460 Ma ages. During D3, dextral shearing tilted the recumbent D2 nappes into a vertical, downward-facing orientation adjacent to the Laurentian margin. D3 is constrained by S3 muscovite ages of c. 448 Ma. Synchronous deformation of the Dalradian Supergroup and the Clew Bay Complex in the mid-Ordovician Grampian orogeny casts doubt on both the validity of Silurian microfossil dates obtained from the Clew Bay Complex and the exotic status of both this ‘terrane’ and the correlative Highland Border Complex of Scotland.
机译：Rb–Sr和 40 Ar / 39 Ar步进加热和原位 40 Ar / 39 Ar 形成织物的云母的激光探针测年为格兰屏造山术的时间以及蓝胶岩相变质作用在劳伦山脉边缘的 的发展提供了新的约束。 sup> 西北爱尔兰。早期（MP 1 ）蓝片岩相组合在沉积于初始Laurentian边缘 边缘附近的Dalradian超群的后代中发育。达拉迪安的 Barrovian变质更接近于Laurentian 前陆。区域性D 2 事件与造山带尺度褶n的形成 有关，并受S 2 <约束在Dalradian 中。 / sub> c的白云母年龄。 460 Ma，可能正在记录 结晶。重要的是，以前 被认为是外来地体（与苏格兰的Highland Border Complex相关的）的Clew Bay Complex和Dalradian处于结构 连续性。来自Clew Bay Complex中S 2 尿布的白云母也能产生相同的c。 460 Ma年龄。在D 3 期间，右旋 剪切使倾斜的D 2 垫子倾斜成垂直的，朝下的 方向，与劳伦式的边缘。 D 3 受c的S 3 白云母年龄的约束 。 448毫安奥陶纪 Grampian造山作用中的 达拉第超群和克利湾复合体的同步变形使人们对获得的志留纪 微化石日期的有效性产生怀疑。来自Clew Bay Complex以及该'terrane'和相关苏格兰的 Highland Border Complex的 异域状态。

著录项

  • 来源
    《Journal of the Geological Society》 |2003年第6期|911-924|共14页
  • 作者

    D.M. Chew; J.S. Daly; L.M. Page; M.J. Kennedy;

  • 作者单位

    Department of Geology, University College Dublin, Dublin 4, Ireland|Present address: Département de Minéralogie, Université de Genève, Rue des Mara?chers 13, CH-1205 Genève, Switzerland (e-mail: david.chew@terre.unige.ch);

    Department of Geology, University College Dublin, Dublin 4, Ireland;

    Laboratory of Isotope Geology, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands|Present address: Department of Geology, Lund University, S?lvegatan 13, 223 62 Lund, Sweden;

    Department of Geology, University College Dublin, Dublin 4, Ireland;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dalradian Supergroup; Clew Bay Complex; Ar/Ar; Rb– Sr; structural geology;

    机译：达拉迪安超群;线索湾综合体;Ar / Ar;Rb–Sr;结构地质;

相似文献

  • 外文文献
  • 中文文献
  • 专利
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