Thermochronology in southeast Alaska and southwest Yukon: Implications for North American Plate response to terrane accretion

Thermochronology in southeast Alaska and southwest Yukon: Implications for North American Plate response to terrane accretion
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阿拉斯加东南部和育空地区西南部的热年代学:北美板块对地体增生反应的影响

DOI:
10.1016/j.epsl.2016.10.032
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发表时间:
2017
影响因子:
5.3
通讯作者:
Ehlers
Ehlers
中科院分区:
地球科学1区
文献类型:
--
作者:
Enkelmann;Piestrzeniewicz;Falkowski;Stübner;Ehlers

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这项研究提出了第一个全面的数据集的低温热年代学从43个基岩样本收集的雅库特-北美板块边界以北的活动。我们的磷灰石和锆石(U-Th)/He和裂变径迹数据揭示了内侧Wrangellia复合地体的冷却历史,该复合地体在晚侏罗世至早白垩世弧岩浆活动之后以快速冷却为主,直到今天只有很少的冷却和折返。由于雅库塔特微板块的碰撞,导致岩石折返的变形在空间上非常有限(20-30公里),主要集中在楚加奇-威廉王子地体和边界山脉断层附近的岩石中。从更深的地方集中挖掘。10公里,具有非常高的速率(>5公里/百万年),位于结区,从约。10 Ma,并在时间上向南移动。快速的折返率解释了强烈的反馈之间的发展,构造驱动的表面隆起和侵蚀,这已经开始在该地区的冰川。位置向南的转移是构造和气候之间不断调整的结果,自晚中新世以来,这种调整在局部和全球范围内都在发生变化。
This study presents the first comprehensive dataset of low-temperature thermochronology from 43 bedrock samples collected north of the active Yakutat–North American plate boundary. Our apatite and zircon (U–Th)/He and fission-track data reveal the cooling history of the inboard Wrangellia Composite Terrane that is dominated by rapid cooling after Late Jurassic to Early Cretaceous arc magmatism followed by very little cooling and exhumation until today. Deformation resulting in rock exhumation due to the collision of the Yakutat microplate is spatially very limited (20–30 km) and is concentrated mainly in the Chugach–Prince William Terrane and rocks near the Border Ranges Fault. Focused exhumation from greater depths of ca. 10 km with very high rates (>5 km/Myr) is localized at the syntaxis region, starting ca. 10 Ma and shifted south through time. The rapid exhumation rates are explained by the development of strong feedbacks between tectonically driven surface uplift and erosion, which started already before glaciation of the area. The shift in the location towards the south is a consequence of continuous readjusting between tectonics and climate, which is changing on local and global scales since the Late Miocene.
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