Miocene-Pliocene strike-slip basin development along the Denali fault system in the eastern Alaska range: Chronostratigraphy and provenance of the Mccallum formation and implications for displacement
Miocene-Pliocene strike-slip basin development along the Denali fault system in the eastern Alaska range: Chronostratigraphy and provenance of the Mccallum formation and implications for displacement
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阿拉斯加东部山脉沿德纳里断层系的中新世-上新世走滑盆地发育：年代地层学和麦卡勒姆地层的物源以及对位移的影响
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发表时间：
2016
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通讯作者：
W. K. Allen
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作者：
W. K. Allen
艾伦卫，K.M.S.，普渡大学，2016年12月。东阿拉斯加山脉德纳利断裂系统的中新世-上新世走滑盆地发展：麦卡勒姆建造的年代地层学和物源及其对位移的意义。主要教授：肯尼斯·里奇韦。德纳利断裂系统代表着北美主要的走滑断裂之一，但人们对这一2000公里长的构造上的位移数量和时间知之甚少。2002年德纳利7.9级地震强调了这一断裂系统对了解阿拉斯加南部会聚边缘上板块变形记录的重要性。我们对位于德纳利断裂中东部的中新世-上新世McCallum组的分析提供了为数不多的关于新近纪位移以及与构造运移有关的地表和盆地过程变化的记录之一。我们建立了麦卡勒姆组的年代地层格架，表明它由两部分地层组成，代表了上段冲积扇沉积体系在下段湖泊地层上的进积。根据我们测量的地层剖面，这个向上粗化的进积包的最小厚度为564米。Ar/Ar测年结果表明，下段年龄在6.1~5.07 Ma之间，上段在5.03~3.80 Ma之间。砂岩的U-Pb碎屑锆石年代学、Ar/Ar碎屑黑云母年龄和Ar/Ar
Allen, Wai, K. M.S., Purdue University, December 2016. Miocene-Pliocene Strike-slip Basin Development along the Denali Fault System in the Eastern Alaska Range: Chronostratigraphy and Provenance of the McCallum Formation and Implications for Displacement. Major Professor: Kenneth Ridgway. The Denali fault system represents one of the major strike-slip faults in North America but very little is known about the amount and timing of displacement on this 2000-kmlong structure. The 7.9 M 2002 Denali Earthquake emphasized the importance of this fault system for understanding the deformational record of the upper plate of the southern Alaska convergent margin. Our analysis of the Miocene-Pliocene McCallum Formation located along the east-central part of the Denali fault provides one of the few records for Neogene displacement as well as changes in surface and basin processes related to tectonic transport. We have established a chronostratigraphic framework for the McCallum Formation that shows that it consists of a two-part stratigraphy that represents the progradation of alluvial-fan deposystems of an upper member over mainly lacustrine strata of a lower member. This upward coarsening progradational package has a minimum thickness of 564 m based on our measured stratigraphic sections. New ages from Ar/Ar geochronology of tephras show that the lower member ranges in age from 6.1 to 5.07 Ma and that the upper member ranges from 5.03 to 3.80 Ma. U-Pb detrital zircon geochronology and Ar/Ar detrital biotite ages from sandstone, and Ar/Ar