...
  • 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 >Is the Iceland hot spot also wet? Evidence from the water contents of undegassed submarine and subglacial pillow basalts
【24h】

Is the Iceland hot spot also wet? Evidence from the water contents of undegassed submarine and subglacial pillow basalts

机译：冰岛热点也湿吗？未脱盐的潜艇和冰川下的枕形玄武岩中水含量的证据

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

Water contents have been measured in basaltic glasses from submarine and subglacial eruption sites along the Reykjanes Ridge and Iceland, respectively, in order to evaluate the hypothesis of Schilling et al. [Phil. Trans. R. Soc. London A 56 (1980) 147-178] that hot spots are also wet spots. Having erupted under pressure the water contents measured in these samples are potentially unaffected by degassing. After correcting these water contents for th effects of crystallisation (to give H_2O(8) values) they indicate that the concentration of water in the source regions increases from 165 ppm at the southern end of the Reykjanes Ridge to between 620 and 920 ppm beneath Iceland. This suggests that Iceland is a wet spot and the H_2O(8) values indicate that its influence on basalt compositions increases northwards along the Reykjanes Rdge from ～61°N (650 km from the plume centre) towards Iceland. The existence of wetter Icelandic source regions have important implications for mantle melting, as enrichments of this magnitude depress the mantle solidus, increasing the degree of melting at a given temperature. Therefore the enhanced rates of volcanism on Iceland may be a result of wetter sources in addition to a thermal anomaly beneath Iceland.
机译：为了评估Schilling等人的假设，分别在雷克雅内斯山脊和冰岛的海底和冰川下喷发地点的玄武玻璃中测量了水含量。 [菲尔。反式R. Soc。 London A 56（1980）147-178]，热点也是湿点。在压力下喷发后，这些样品中测得的水分可能不受脱气的影响。在校正了结晶作用的水含量（给出H_2O（8）值）后，它们表明源区中的水浓度从雷克雅尼斯海岭南端的165 ppm增加到冰岛下方的620至920 ppm之间。这表明冰岛是一个湿点，H_2O（8）值表明它对玄武岩成分的影响沿雷克雅内斯山脉（Reykjanes Rdge）向北延伸，从〜61°N（距羽流中心650公里）朝向冰岛。湿的冰岛源区的存在对地幔融化具有重要意义，因为这种数量级的富集压低了地幔固相线，增加了给定温度下的融化程度。因此，除了冰岛下方的热异常外，冰岛火山活动率的提高可能是由于湿源造成的。

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