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首页> 外文期刊>GSA Today >Subduction Polarity in Ancient Arcs: A Call to Integrate Geology and Geophysics to Decipher the Mesozoic Tectonic History of the Northern Cordillera of North America
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Subduction Polarity in Ancient Arcs: A Call to Integrate Geology and Geophysics to Decipher the Mesozoic Tectonic History of the Northern Cordillera of North America

机译：古代弧中的俯冲极性：呼吁将地质和地球物理学整合以破译北美北部科塞尔氏岩的中生代构造史

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摘要

Recent syntheses of Cordillera tectonics contain contradictory views of subduction polarity in the late Mesozoic, and this contradiction has implications for whole-earth processes. The long-held view of east-dipping subduction throughout the Late Jurassic-Early Cretaceous Cordillera is challenged by tectonic models calling on a west-dipping subduction system that led to the collision of oceanic arcs, ribbon-continents, or both, with North America. Evidence in support of these models are seismic anomalies in the deep mantle inferred to represent subducted lithosphere from a west-dipping slab. We argue that this "bottom-up" approach to tectonic synthesis carries assumptions that are as great as or greater than ambiguities from the "top-down" approach of surface geology.
机译：最近的Cordillera构造合成含有后期中生代中的俯视极性的矛盾观点，这一矛盾对全地域过程产生了影响。 在侏罗纪早期的白垩纪科特勒拉州的东部浸出俯视长期以来受到了西浸的俯冲系统的构造模型，导致了海洋弧，丝带或两者的碰撞，与北美 。 支持这些模型的证据是深层地幔中的地震异常，推断出从西浸的板坯代表过滤的岩石圈。 我们认为，这种“自下而上”的构造合成方法带有比表面地质的“自上而下”方法从含糊不大或大于歧义的假设。

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  • 来源
    《GSA Today》 |2019年第11期|共7页
  • 作者

    Terry L. Pavlis; Jeffrey M. Amato; Jeffrey M. Trop;

  • 作者单位

    Dept. of Geological Sciences University of Texas El Paso Texas 79968 USA;

    Dept. of Geological Sciences New Mexico State University Las Cruces New Mexico 88003 USA;

    Dept. of Geology and Environmental Geosciences Bucknell University Lewisburg Pennsylvania 17837 USA;

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  • 正文语种 eng
  • 中图分类 水文地质学与工程地质学;
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