...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geological Society of America Bulletin >Tectonic geomorphology of active olding over buried reverse faults: San Emigdio Mountain front, southern san Joaquin Valley,California
【24h】

Tectonic geomorphology of active olding over buried reverse faults: San Emigdio Mountain front, southern san Joaquin Valley,California

机译：埋藏的反向断层上活跃老龄化的构造地貌：加利福尼亚州圣华金山谷南部的圣埃米吉迪奥山锋

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

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 deg and a minimum age of about 65 ka provide evidence of late Pleistocene deformation at the active range front. Studies of ht esurface folding of alluvial fans and fluvial terraces indicate a Holocene vertical dformation rate of 1.9-3.0 m/k.y. at the active range front and 0.8-1.3 m/k.y. approx2 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：在加利福尼亚州圣华金山谷南部的圣埃米吉迪奥山前，对埋藏的反向断层上活动褶皱的构造地貌进行了调查，从而提供了有关活动褶皱和断裂所产生的山前构造和地貌发育的见识。单轴弯曲的砾石倾角最大为50度，最小年龄约为65 ka，为活动范围前沿晚更新世变形提供了证据。对冲积扇和河床阶地的表面折叠研究表明，全新世垂直变形速率为1.9-3.0 m / k.y。在有效范围前端和0.8-1.3 m / k.y。向后约2公里。地貌证据还表明，沿着圣埃米吉迪奥山北翼的活跃褶皱和垂直变形的地点已经向盆地迁移并继续向盆地迁移。这些证据包括一个遗迹山前，现在位于隆起的地块内，距离当前活动的山前5公里，并且在距山前2公里的活动冲积扇中存在新近形成的褶皱。随着活动褶皱的位置向盆底移动，构造活动的北移导致隆起块体的逐渐扩大。构造活动的这种迁移似乎是通过沿北向褶皱和断层的垂直变形的发生和随后的增加而发生的，伴随着沿较老的，向南倾斜的结构活动的减少和最终停止。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号