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首页> 外文期刊>GSA Bulletin >Tectonic geomorphology of active folding over buried reverse faults: San Emigdio Mountain front, southern San Joaquin Valley, California
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Tectonic geomorphology of active folding over buried reverse faults: San Emigdio Mountain front, southern San Joaquin Valley, California

机译：埋藏的反向断层活动褶皱的构造地貌：加利福尼亚州圣华金谷南部的圣埃米吉迪奥山锋

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摘要

Investigation of the tectonic geomorphology of active folding over buried reverse faults at the San Emigdio Mountain front, southern San Joaquin Valley, California, provides insight concerning the tectonic and geomorphic development of mountain fronts produced by active folding and faulting. Monoclinally flexed gravels with dips as great as 50° and a minimum age of about 65 ka provide evidence of late Pleistocene deformation at the active range front. Studies of the surface folding of alluvial fans and fluvial terraces indicate a Holocene vertical deformation rate of 1.9–3.0 m/k.y. at the active range front and 0.8–1.3 m/k.y. 2 km basinward. Geomorphic evidence also indicates that the locus of active folding and vertical deformation along the northern flank of the San Emigdio Mountains has migrated and continues to migrate basinward. This evidence includes a relict mountain front, now within the uplifted block, 5 km from the present active mountain front, and the existence of recently initiated folds in the active alluvial fan 2 km basinward from the mountain front. Northward migration of tectonic activity results in the progressive widening of the uplifted block as the location of active folding moves basinward. This migration of tectonic activity appears to occur through the onset and subsequent increase of vertical deformation along more northerly folds and faults accompanied by reduction and eventual cessation of activity along the older, more southerly structures.
机译：对加利福尼亚南部圣华金河谷圣埃米吉迪奥山前埋藏的反向断裂上活动褶皱 的构造地貌的研究提供了有关 的见识。主动褶皱和断层作用产生的山锋构造和地貌发育。单轴弯曲砾石 的倾角最大为50°，最小年龄约为65 ka，提供了在活动 范围前沿晚更新世变形的证据。 。对冲积扇 和河流阶地的表面折叠研究表明，全新世垂直变形 的速率为1.9-3.0 m / k.y。在有效范围的前面和0.8–1.3 m / k.y。向后2公里。地貌证据还表明， 沿着圣埃米吉迪奥山的 北翼的活跃折叠和垂直变形的轨迹已经向盆地迁移，并且 继续向盆地内迁移。 。该证据包括一个遗物 山锋，该山锋现在位于隆起的地块内，距 当前活动的山锋5公里，以及最近发起的 在 山腰向后2 km处的活跃冲积扇中折叠。构造活动的北移 导致了隆起块体的逐步扩大，因为 的活动折叠位置向盆底移动。构造活动的这种迁移 似乎是通过垂直变形的发生和随后的 的增加而发生的，并且沿着更北的 的褶皱和断层伴随着减少和最终停止而发生。 沿较旧，偏南的建筑物的活动。

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  • 来源
    《GSA Bulletin》 |2000年第1期|86-97|共12页
  • 作者

    E. A. Keller; D. B. Seaver; D. L. Laduzinsky; D. L. Johnson; T. L. Ku;

  • 作者单位

    Environmental Studies Program and Department of Geological Sciences, University of California, Santa Barbara, California 93106;

    SEPUP, Lawrence Hall of Science, University of California, Berkeley, California 94720;

    Henshaw Associates, Inc., 11875 Dublin Boulevard, Suite A-200, Dublin, California 94568;

    Department of Geography, University of Illinois, Urbana, Illinois 61801;

    Department of Earth Sciences, University of Southern California, Los Angeles, California 90089;

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