Low-temperature thermochronology of the Yakutat plate corner, St. Elias Range (Alaska): bridging short-term and long-term deformation
Low-temperature thermochronology of the Yakutat plate corner, St. Elias Range (Alaska): bridging short-term and long-term deformation
复制标题
DOI：
10.1016/j.quascirev.2014.10.019
复制
发表时间：
2015-04-01
影响因子：
4
通讯作者：
Champagnac, Jean-Daniel
中科院分区：
文献类型：
--
作者：
Enkelmann, Eva;Valla, Pierre G.;Champagnac, Jean-Daniel
本研究调查了长期的变形和岩石折返的俯冲雅库塔特微板块角在圣埃利亚斯结合带地区，特别关注的地区东部和西部的雅库塔特湾，主要同震地表隆起发生在1899年的M-W 8.2地震。我们使用低温热年代学来量化逆冲断层和逆断层的长期活动。我们提出了新的磷灰石和锆石（U-Th-Sm）/He年龄从35个基岩样品收集沿着配置文件跨越主要故障，构成一个片面的花状结构在费尔韦瑟断层的北方结束。冷却年龄显示，东部Esker Creek断层和Yakutat断层以2-3 mm/年的速率和较慢的
This study investigates the long-term deformation and rock exhumation of the subducting Yakutat microplate corner at the St. Elias syntaxis region with a special focus on the area east and west of Yakutat Bay, where major coseismic surface uplift occurred during a M-w 8.2 earthquake in 1899. We use low-temperature thermochronology to quantify the long-term activity of thrust and reverse faults. We present new apatite and zircon (U-Th-Sm)/He ages from 35 bedrock samples collected along profiles crossing major faults that compose a one-sided flower structure at the northern end of the Fairweather Fault. The cooling ages reveal that rapid rock exhumation is accommodated by the eastern Esker Creek Fault and the Yakutat Fault with rates of 2-3 mm/yr and slower rates of