...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Scottish Journal of Geology >How hot are the Cairngorms?
【24h】

How hot are the Cairngorms?

机译：Cairngorms有多热？

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

Heat flow measured over the East Grampians batholith in the 1980s was found to be unexpectedly low and at odds with high radiogenic heat production within the outcropping granites and a very large volume of granite predicted from an interpretation of gravity data. Past climate variations perturb temperature gradients in the shallow subsurface leading to erroneous estimates of heat flow. A reconstruction of the surface temperature history during the last glacial cycle has enabled a rigorous palaeoclimate correction to be applied to the heat flow that shows an increase of 25% over previously reported values; revised to 86 +/- 7 mW m(-2). An interpretation of recent mapping reveals that the surface exposures of the East Grampians granites are the roof zones of a highly evolved magma system. Rock composition, therefore, is likely to become more mafic with depth and the heat production will decrease with depth. This petrological model can be reconciled with the gravity data if the shape of the batholith is tabular with deep-seated feeder conduits. The increased heat flow value leads to revised predictions of subsurface temperatures of 129 degrees C at 5 km depth and 176 degrees C at 7 km depth, increases of 40% and 49%, respectively, compared to previous estimates. These temperatures are at the lower end of those currently required for power generation with Engineered Geothermal Systems, but could potentially be exploited as a direct heat use resource in the Cairngorm region by targeting permeable fractures with deep boreholes.
机译：发现在1980年代东格兰屏岩基上测得的热流出乎意料地低，并且与露头花岗岩内部的放射源热产生高，并且通过解释重力数据预测的大量花岗岩相矛盾。过去的气候变化扰乱了浅层地下的温度梯度，从而导致对热流的错误估计。在最后一次冰川循环期间对表面温度历史记录的重建使得能够对热流进行严格的古气候校正，从而显示出比先前报告的值增加了25％。修订为86 +/- 7 mW m（-2）。对最新测绘的解释表明，东格兰屏花岗岩的表面暴露是高度演化的岩浆系统的屋顶区域。因此，岩石组成随着深度的增加可能会变得更加镁铁质，并且热量的产生将随着深度的增加而降低。如果岩床的形状呈板状，且带有深深的馈线导管，则该岩石学模型可以与重力数据相吻合。增加的热流值导致对地下温度在5 km深度为129摄氏度和在7 km深度为176摄氏度的地下温度的修订预测，与以前的估计相比分别增加了40％和49％。这些温度低于目前使用工程地热系统发电所需的温度的下限，但通过瞄准深孔可渗透裂缝，可以将其用作凯恩戈姆地区的直接供热资源。

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