...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global and planetary change >Elastic stress interaction between faulting and volcanism in the Olacapato-San Antonio de Los Cobres area (Puna plateau, Argentina)
【24h】

Elastic stress interaction between faulting and volcanism in the Olacapato-San Antonio de Los Cobres area (Puna plateau, Argentina)

机译：Olacapato-San Antonio de Los Cobres地区（阿根廷普那高原）断层与火山之间的弹性应力相互作用

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

We describe the relationships between Plio-Quaternary tectonics, palaeoseismicity and volcanism along the NW-trending Calama-Olacapato-El Toro (COT) lineament that crosses the Andean chain and the Puna Plateau and continues within the eastern Cordillera at about 24° S. We studied in detail the area from the Chile-Argentina border to a few km east of the San Antonio del Los Cobres village. Satellite and field data revealed the presence of seven Quaternary NW-striking normal left-lateral fault segments in the southeastern part of the studied area and of a Plio-Quaternary N-S-striking graben structure in the northwestern part. The NW-striking Chorrillos fault (CF) segment shows the youngest motions, of late Pleistocene age, being marked by several fault scarps, sag ponds and offset Quaternary deposits and landforms. Offset lavas of 0.78 ±0.1 Ma to 0.2 ±0.08 Ma indicate fault kinematics characterised by a pitch angle of 20° to 27° SE, a total net displacement of 31 to 63.8 m, and a slip-rate of 0.16 to 0.08 mm/yr. This fault segment is 32 km long and terminates to the northwest near a set of ESE-dipping thrust faults affecting Tertiary strata, while to the southeast it terminates 10 km further from San Antonio. In the westernmost part of the examined area, in Chile at altitudes ＞ 4000 m, recent N-S-striking normal fault scarps depict the 5-km-wide and 10-km-long graben structure. Locally, fault pitches indicate left-lateral normal kinematics. These faults affect deposits up to ignimbrites of Plio-Quaternary age. Scarp heights are from a few metres to 24 m. Despite that this area is located along the trace of the COT strike-slip fault system, which is reported as a continuous structure from Chile to Argentina in the literature, no evidence of NW-striking Plio-Quaternary strike-slip structures is present here. A series of numerical models were also developed in an elastic half-space with uniform isotropic elastic properties using the Coulomb 3.1 code. We studied the stress changes caused by slip along the various Quaternary COT fault segments, showing that the last motions occurred along the CF might promote in the future further displacement along nearby fault segments located to the northwest Furthermore, slip along the NW-striking fault segments imparts normal stress changes on the nearby Tuzgle volcano feeding system.
机译：我们沿穿越安第斯山脉和普纳高原的西北趋势卡拉马-奥拉卡帕托-埃尔托罗（COT）线向西北发展，描述了第四纪构造，古地震和火山活动之间的关系。详细研究了从智利-阿根廷边界到圣安东尼奥·德尔·洛斯·科布雷斯村以东几公里的地区。卫星和现场数据显示，在研究区域的东南部存在7个第四系西北向撞击的正常左断层段，在西北部存在一个Plio-第四纪N-S向grab陷的en陷构造。西北冲动的Chorrillos断层（CF）区段显示了更新世晚期的最年轻的运动，其特征是有几个断层陡峭带，下陷的池塘和偏移的第四纪沉积物和地貌。偏移熔岩为0.78±0.1 Ma至0.2±0.08 Ma表示断层运动学，其俯仰角为20°至27°SE，总净位移为31至63.8 m，滑移率为0.16至0.08 mm / yr 。该断层段长32 km，终止于西北，靠近一系列影响第三系地层的ESE俯冲冲断层，而东南则终止于距圣安东尼奥市10 km的地方。在受检区域的最西端，在智利海拔＞ 4000 m处，最近的N-S冲击正常断层陡坡描绘了5公里宽和10公里长的grab陷结构。在局部，断层间距表示左侧的正常运动学。这些断层影响着沉积物，直至上古时代的火成岩。 carp骨的高度从几米到24 m。尽管该区域位于沿COT走滑断层系统的轨迹上，据文献报道该区域是从智利到阿根廷的连续结构，但此处没有证据表明存在西北偏向的Plio-第四纪走滑结构。还使用库仑3.1代码在具有均匀各向同性弹性特性的弹性半空间中开发了一系列数值模型。我们研究了沿第四纪COT断层段滑动引起的应力变化，表明沿CF发生的最后运动可能会在将来促进西北部附近断层段进一步位移。此外，沿西北走向的断层滑动在附近的Tuzgle火山补给系统上施加正应力变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 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