• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geodynamics >An ancient seismite response to Taconian far-field forces: The Cane Run Bed, Upper Ordovician (Trenton) Lexington Limestone, central Kentucky (USA)
【24h】

An ancient seismite response to Taconian far-field forces: The Cane Run Bed, Upper Ordovician (Trenton) Lexington Limestone, central Kentucky (USA)

机译：对塔科尼亚远场部队的古代地震反应：美国上肯塔基州中奥陶纪（特伦顿）列克星敦石灰石的甘蔗滑床

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

The Cane Run Bed is a prominent unit of micrograined limestone and shale of distal storm origin in the lower part of the Late Ordovician (late Chatfieldian; late Caradoc) Lexington Limestone (Trenton) in central Kentucky, USA. The unit's prominence relates to presence of up to three horizons of pene-contemporaneous, soft-sediment deformation that form a distinctive event bed; equivalent horizons of different lithology are also deformed. Concurrence of four lines of evidence, including deformation consistent with a seismogenic origin, widespread distribution in temporally and stratigraphically constrained horizons, a pattern of increasing frequency or deformation intensity toward likely epicentral areas, and the ability to exclude other likely causes, points strongly to a seismogenic origin for each horizon. This interpretation is bolstered by the facts that the deformation contains random fold axes, crosses facies boundaries, is associated with a periodically reactivated basement structural lineament, and crosscuts undeformed beds from both above and below. Moreover, mapping the distribution of deformation intensity allows for the interpretation of possible epicentral areas. The association of Cane Run deformation with other sedimentologic-stratigraphic anomalies related to reactivated basement faults, as well as their coincidence with the inception of a Taconian tectophase, suggest that Cane Run seismites are one of several responses to the distal transmission of far-field forces from the coeval Taconian orogeny into the foreland, largely via zones of basement structural weakness. Units like the Cane Run Bed and its equivalents, whose seismogenic origins can be confidently demonstrated, suggest that seismicity must have had a substantial influence at times on epicontinental sedimentation, even in seas far removed from orogenic sources of stress.
机译：甘蔗流化床是美国肯塔基州中部晚奥陶纪（晚查特菲尔德期；卡拉多克晚期）下部列克星敦石灰岩（特伦顿）下部的微粒状石灰岩和远期风暴成因的重要页岩。该单元的突出之处涉及多达三个水平的笔形同时期软沉积物变形，形成了独特的事件床。不同岩性的等效地层也变形了。四项证据的同时存在，包括与地震成因相一致的形变，在时间和地层上受约束的地层中的广泛分布，向可能的震中区域增加频率或变形强度的模式以及排除其他可能原因的能力，这些都强烈地表明了每个视野的震源。变形包含随机折叠轴，跨相边界，与周期性重新活化的地下构造构造以及横切未变形岩床的事实相关的事实支持了这种解释。此外，绘制变形强度的分布图可以解释可能的震中区域。 Cane Run变形与其他与重新活化的基底断层有关的沉积物-地层异常的关联，以及它们与Taconian构造相的出现相吻合，表明Cane Run地震岩是对远场力向远侧传播的几种响应之一从中世纪的塔科尼亚造山带进入前陆，主要是通过基底结构薄弱带。可以可靠地证明其地震成因的甘蔗流化床及其类似物这样的单位表明，即使在远离造山成因的海洋中，地震活动有时也会对陆上沉积产生重大影响。

著录项

相似文献

  • 外文文献
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