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Superimposition and timing of deformations in the Mount Morrison roof pendant and in the central Sierra Nevada, California

机译：加利福尼亚州内华达山脉中部的莫里森山顶吊坠和形变的叠加和时间

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摘要

The Mount Morrison roof pendant, the only roof pendant in the central Sierra Nevada containing Paleozoic fossils, is complexly deformed and contains three generations of structures, including folds, reverse faults, schistosities, and lineations. All three generations of structures occur in the Ordovician-Silurian(?) metasedimentary rocks, whereas only the younger two are recorded in the Pennsylvanian-Permian(?) metasedimentary rocks and the Permian(?)-Jurassic(?) metavolcanic rocks. The average strike directions of axial planes of folds are north-south, N25°W, and N60°W in the first, second, and third generations, respectively. Generations of structures having similar styles, orientations, and relative age relations occur in other pendants of the central Sierra Nevada. The pendant is interpreted as a thin sequence with tight isoclinal folds instead of a thick homoclinal sequence. The first deformation occurred during Devonian or Mississippian time, perhaps during the Antler orogeny. Uplift, erosion, and volcanism occurred in Late Permian time between the first and second deformations, perhaps as an expression of the Sonoma orogeny. The second generation structures formed in several pulses between Early Triassic and Early Cretaceous time, as indicated by temporal relations between deformed wall rocks and younger, crosscutting granitic plutons. The third generation structures formed between Early and Late Cretaceous time, during which these structures were crosscut by granitic rocks. The wall rocks of the batholith may form an anticlinorium instead of a synclinorium. Other roof pendants in the axial portion of the batholith may be relatively old, because they contain the same three sets of structures as found in the Ordovician-Silurian(?) rocks of the Mount Morrison roof pendant. Locally, various age belts of granitic rocks have shielded roof pendants from subsequent deformation.
机译：莫里森山的屋顶吊坠是内华达山脉中部唯一包含古生代化石的屋顶垂饰，经过复杂的 变形，并包含三代结构，包括 褶皱，反向断层，集疏和构造。结构的所有三个 世代都发生在奥陶纪-西鲁里安（？） 沉积岩中，而宾夕法尼亚州-二叠纪中只有年轻的两个记录 。 （？）准沉积岩和 二叠纪（？）-侏罗纪（？）超火山岩。在第一，第二和第三代中，褶皱轴向平面的平均走向 分别为南北，N25°W， 和N60°W。 > 内华达山脉中部的其他垂饰中也出现了具有相似样式，方向， 和相对年龄关系的结构的生成。 悬垂物被解释为具有紧密等腰线 折叠的薄序列，而不是厚的同斜序列。第一次变形 发生在泥盆纪或密西西比时期，也许发生在 鹿角造山运动中。隆升，侵蚀和火山作用在二叠纪晚期和第一次变形之间发生了 ，也许是索诺玛造山作用的一种表达。第二代 结构在早三叠世和 白垩纪时间之间的几个脉冲中形成，如 变形围岩与较年轻的横切线之间的时间关系所表明的那样。 第三代结构形成于白垩纪早期和晚期 之间，在此期间这些结构被花岗岩岩石横切 。 / sup>岩床的围岩可能会形成防潮层，而不是斜向斜层的 。岩基岩轴向部分 中的其他屋顶垂饰可能相对较旧，因为它们所包含的 与奥陶纪-lur流星系（？） Mount Morrison屋顶吊坠的岩石。在本地，各种时代的 花岗岩岩石带都屏蔽了屋顶垂饰，防止随后的 变形。

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  • 来源
    《GSA Bulletin》 |1977年第3期|335-345|共11页
  • 作者

    STEPHEN RUSSELL; WARREN NOKLEBERG;

  • 作者单位

    Department of Geology, California State University, Fresno, California 93740;

    Department of Geology, California State University, Fresno, California 93740;

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