Long distance plutonic relationships demonstrate 33 million years of strain partitioning along the Denali fault
Long distance plutonic relationships demonstrate 33 million years of strain partitioning along the Denali fault
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DOI：
10.1111/ter.12555
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发表时间：
2021-08
期刊：
影响因子：
2.4
通讯作者：
S. Regan;J. Benowitz;T. Waldien;M. Holland;S. Roeske;P. O’Sullivan;P. Layer
中科院分区：
文献类型：
--
作者：
S. Regan;J. Benowitz;T. Waldien;M. Holland;S. Roeske;P. O’Sullivan;P. Layer
我们确定了两个刺穿点对沿着一个约500公里的横断面的弧形走滑德纳里断层记录长期滑动分割。Foraker和Panorama-Schist Creek-Nenana岩体之间的地球化学和同位素相似性表明，自37 Ma以来，Denali西部断层以约4.2 mm/年的速度发生了约155 km的右侧位移。Denali东部断层Maclaren棉白杨地体地质年代学对比表明，自33 Ma以来，Denali东部断层以约9.2 mm/年的速率发生了约305 km的位移。西部（5.3毫米/年）和东部（12.9毫米/年）迪纳利断层之间的更新世-全新世滑动速率比为0.41，我们的新约束产生了晚始新世-全新世的比率为0.46。因此，我们解释说，德纳里断层主股的整体弧形几何形状是由33马。我们推断，德纳里断层和其他高度滑动分割断层系统的持久长波几何稳定性与长期高度斜交逆冲环境有关。
We identify two piercing point pairs along a ~500 km transect of the arcuate strike‐slip Denali fault to document long‐term slip partitioning. Geochemical and isotopic similarity between Foraker and Panorama‐Schist Creek‐Nenana Plutons suggest ~155 km of right‐lateral displacement on the western Denali fault since 37 Ma at a rate of ~4.2 mm/year. The eastern Denali fault Maclaren‐Cottonwood Terrane geochronology correlation establishes ~305 km of displacement on the eastern Denali fault since 33 Ma at a rate of ~9.2 mm/year. The ratio of Pleistocene‐Holocene slip rates between the western (5.3 mm/year) and eastern (12.9 mm/year) Denali fault is 0.41 and our new constraints yield a Late Eocene‐Holocene ratio of 0.46. Hence, we interpret that the overall arcuate geometry of the Denali fault master strand was established by 33 Ma. We infer that the persistent long‐wave geometric stability of the Denali fault and other highly slip partitioned fault systems are related to long‐term highly oblique transpressive environs.