Reinterpretation of lower Mesozoic rocks on the Chilkat Peninsula, Alaska, as a displaced fragment of Wrangellia
Reinterpretation of lower Mesozoic rocks on the Chilkat Peninsula, Alaska, as a displaced fragment of Wrangellia
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将阿拉斯加奇尔卡特半岛的下中生代岩石重新解释为兰盖利亚的移位碎片
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
N. J. Silberling
中科院分区：
文献类型：
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作者：
G. Plafker;C. Blome;N. J. Silberling
南部奇尔卡特半岛下面是低级变质岩，包括一个厚的部分卡尼期的绿岩单元，局部被一个钙质沉积岩的衰减部分和卡尼晚期至诺利晚期的海图以及一个厚的侏罗纪和/或白垩纪复理石单元覆盖。该层序的三叠纪部分先前被推断为Taku Mie的一部分。然而，它的岩性，年龄，化石和区域分布表明，它可能是一个银的Wrangellia从阿拉斯加山脉东部偏移到现在的位置，在德纳里断层上至少有350公里的右旋位移。
The southern Chilkat Peninsula is underlain by low-grade metamorphic rocks consisting of a thick unit of greenstone, in part of Carnian age, that is locally overlain by an attenuated section of calcareous sedimentary rocks and chart of latest Carnian to late Norian age and a thick flysch unit of Jurassic and/or Cretaceous age. The Triassic part of this sequence has previously been inferred to be part of the Taku terrane. However, its lithology, age, fossils, and regional distribution indicate that it is probably a sliver of Wrangellia that was offset from the eastern Alaska Range to its present position by at least 350 km dextral displacement on the Denali fault.