Along-fault migration of the Mount McKinley restraining bend of the Denali fault defined by late Quaternary fault patterns and seismicity, Denali National Park & Preserve, Alaska

Along-fault migration of the Mount McKinley restraining bend of the Denali fault defined by late Quaternary fault patterns and seismicity, Denali National Park & Preserve, Alaska
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由晚第四纪断层模式和地震活动定义的德纳利断层的麦金利山限制弯曲的沿断层迁移,德纳利国家公园

DOI:
10.1016/j.tecto.2016.05.009
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发表时间:
2016
期刊:
影响因子:
2.9
通讯作者:
Benowitz, Jeff A.
Benowitz, Jeff A.
中科院分区:
地球科学2区
文献类型:
--
作者:
Burkett, Corey A.;Bemis, Sean P.;Benowitz, Jeff A.

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北美最高的山德纳利山(以前的麦金利山,海拔6190米)位于右侧走滑的德纳利断层的一个陡峭的弯道内。这种异常的地形显然与德纳利断层复杂的几何形状有关,但这种限制性弯曲是如何与区域地形一起演化的尚不清楚。为了约束德纳利断裂的这一弯曲是如何变形的,我们通过结合地质填图、活动断裂特征和背景地震活动分析,记录了德纳利断裂以北的第四纪与断层有关的变形。我们的地图显示了断裂样式的东西向变化,其中正断层发生在断弯以东,而逆冲断层主要发生在西边。复杂的区域地震活动证实了断层弯曲附近的断裂样式,并提供了对弯曲附近地壳局部应力场变化的额外洞察。活动断裂的样式和地震活动模式定义了一个变形带,该变形带容纳了这个约束弯曲向西南方向的迁移。德纳利断裂以北活动断裂的断层滑动速率表明,麦金利山限制弯以晚更新世/全新世的速度沿德纳利断裂迁移,速度约为2-6 mm/a。正在进行的麦金利山限制弯的热年代学和构造研究将把这些限制扩展到时间上更深的限制弯的迁移和演化,并延伸到德纳利断层以南。
The tallest mountain in North America, Denali (formerly Mount McKinley, 6,190 m), is situated inside an abrupt bend in the right-lateral strike-slip Denali fault. This anomalous topography is clearly associated with the complex geometry of the Denali fault, but how this restraining bend has evolved in conjunction with the regional topography is unknown. To constrain how this bend in the Denali fault is deforming, we document the Quaternary fault-related deformation north of the Denali fault through combined geologic mapping, active fault characterization, and analysis of background seismicity. Our mapping illustrates an east–west change in faulting style where normal faults occur east of the fault bend and thrust faults predominate to the west. The complex and elevated regional seismicity corroborates the style of faulting adjacent to the fault bend and provides additional insight into the change in local stress field in the crust adjacent to the bend. The style of active faulting and seismicity patterns define a deforming zone that accommodates the southwestward migration of this restraining bend. Fault slip rates for the active faults north of the Denali fault, derived from offset glacial outwash surfaces, indicate that the Mount McKinley restraining bend is migrating along the Denali fault at a late Pleistocene/Holocene rate of ~ 2–6 mm/yr. Ongoing thermochronologic and structural studies of the Mount McKinley restraining bend will extend these constraints on the migration and evolution of the restraining bend deeper in time and to the south of the Denali fault.
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