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首页> 外文期刊>GSA Bulletin >Late Neogene and Quaternary landscape evolution of the northern California Coast Ranges: Evidence for Mendocino triple junction tectonics
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Late Neogene and Quaternary landscape evolution of the northern California Coast Ranges: Evidence for Mendocino triple junction tectonics

机译：北部加利福尼亚海岸山脉的新近纪晚期和第四纪景观演化：Mendocino三结构造的证据

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摘要

A landscape records the surface response to tectonics at time scales intermediate between short time-scale information derived from seismic imaging and global positioning systems and the long-term geologic record. We link late Neogene and Quaternary deposits and landforms in the northern California Coast Ranges to the tectonics of the Mendocino triple junction. In the northern California Coast Ranges, the Mendocino crustal conveyor geodynamic model describes crustal thickening, thinning, and dynamic topography that produce a "double-humped" pattern of uplift that migrates northward with the Mendocino triple junction. The tectonics are manifest in the drainage system and elevation pattern of the Coast Ranges. At long wavelengths, the elevation pattern closely matches the predicted double-peaked shape of Mendocino crustal conveyor topography, and the high points of uplift control the location of drainage divides. Presently, the divide between the Russian and Eel Rivers and the divide between the Eel and Van Duzen Rivers approximately correspond to the peaks of uplift predicted by the Mendocino crustal conveyor model. As the triple junction migrates northward, the double-humped pattern of uplift and subsidence migrates, and the Coast Ranges emerge. Smaller drainages develop and evolve by stream capture and flow reversal, and the two main divides migrate in concert with the triple junction. In contrast to the systematic development of the small streams, the largest trunk streams can maintain grade through regions of high uplift, and coastal river mouths remain stationary despite the uplift moving north. Before ca. 2 Ma, the majority of the Coast Range drainage flowed to a southern coastal outlet near the present mouth of the Russian River. At 2 Ma, facilitated by headwater stream capture at key locations, the drainage direction reversed, and the majority of Coast Range rivers now drain into the north-flowing Eel River. The major drainage reorganization at 2 Ma highlights the potential for complexity in geomorphic response to tectonics.
机译：一个景观记录了在 时间尺度上对构造的表面响应，介于从地震成像和全球定位系统得到的 短时间尺度信息与 长期地质记录。我们将北加利福尼亚北部海岸 的新近纪晚期和第四纪的沉积物和地貌与门多西诺三结的构造相联系。在北部 加利福尼亚海岸山脉中，Mendocino地壳输送机的地动力学 模型描述了产生“双峰”的地壳增厚，变薄和动态地形 。 “门多西诺（Mendocino）三联结向北迁移 的隆起模式。构造特征 表现在 海岸山脉的排水系统和高程模式中。在长波长处，高程图 与门多西诺 地壳输送带地形的预测双峰形状紧密匹配，并且升力控制的最高点 排水沟的位置。目前， 俄罗斯河与Eel河之间的鸿沟以及Eel和 Van Duzen河之间的鸿沟大约对应于由预测的隆起 高峰。 Mendocino地壳输送机模型。随着Triple 结点向北迁移，隆起 和沉陷的双峰模式迁移，并且出现了海岸山脉。较小的 排水通过流捕获和逆流而发展和演变， 和两个主要的鸿沟与三重 交界处一起迁移。与小的 溪流的系统开发相反，最大的主干流可以通过高隆起的 区域保持坡度，而沿海河口保持静止 尽管隆起向北移动。前约。 2 Ma，大部分 海岸山脉排水流向俄罗斯河口附近的南部沿海出口 。在2 Ma时，通过在关键位置捕获水源促进了 ，排水方向 反向，并且大多数海岸山脉河流现在都排入了 北流的鳗鱼河。 2 Ma的主要排水重组 强调了地貌 响应构造的复杂性。

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  • 来源
    《GSA Bulletin》 |2006年第10期|1232-1246|共15页
  • 作者

    Jane Lock; Harvey Kelsey; Kevin Furlong; Adam Woolace;

  • 作者单位

    Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Department of Geology, Humboldt State University, Arcata, California 95521, USA;

    Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Department of Geology, Humboldt State University, Arcata, California 95521, USA;

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