...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Are some of the deep crustal conductive features found in SW Iberia caused by graphite?
【24h】

Are some of the deep crustal conductive features found in SW Iberia caused by graphite?

机译：伊比利亚西南部发现的某些深层地壳导电特征是由石墨引起的吗？

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

Recent results obtained from two-dimensional inversion of magnetotelluric (MT) data acquired in SW Iberia reveal high-conductive features at the middle-lower levels of the crust. The top of these anomalous structures correlates very well with the depth (10-13 km) of an important seismic interface that has been interpreted as a regional detachment horizon. Very shallow and relatively narrow conductors in the Ossa Morena Zone appear to correspond to small-scale fluid-deposited graphite systems in the preorogenic metasedimentary sequences. Some of the midcrustal conductors can be ascribed to graphite-bearing thrust zones, the formation of graphite with variable crystallinity being a consequence of Variscan shearing processes. Deep-seated conductors are tentatively interpreted as a result of relatively continuous, highly crystalline grain-boundary graphite films presumably preserved in basement, granulite(?) rocks. Assuming that graphite occurs as interconnected films, calculations indicate that a fraction of 0.006-0.02% of this accessory mineral is enough to explain the range of the electrical resistivity estimated on the basis of MT models. The role of graphite on the thermal behaviour of the crust is also discussed. The results show that low contents of graphite do not significantly change the thermal behaviour of earth materials.
机译：从西南伊比利亚地区获得的大地电磁（MT）数据进行二维反演获得的最新结果显示，地壳的中下层具有高导电性。这些异常结构的顶部与重要地震界面的深度（10-13 km）具有很好的相关性，该地震界面被解释为区域脱离层。 Ossa Morena区中非常浅且相对较窄的导体似乎对应于造山前沉积沉积层序中的小规模流体沉积石墨系统。某些中壳导体可归因于带有石墨的推力区，具有可变结晶度的石墨的形成是瓦里斯坎剪切过程的结果。尝试将深层导体解释为相对连续的，高度结晶的晶界石墨膜的结果，该膜可能保留在基底的花岗石（？）岩石中。假设石墨是作为相互连接的薄膜出现的，则计算表明该辅助矿物的0.006-0.02％的比例足以解释根据MT模型估算的电阻率范围。还讨论了石墨对地壳热行为的作用。结果表明，低含量的石墨不会显着改变土壤材料的热行为。

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