...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >Assessing The Potential For Future Explosive Activity From Teide-pico Viejo Stratovolcanoes (tenerife, Canary Islands)
【24h】

Assessing The Potential For Future Explosive Activity From Teide-pico Viejo Stratovolcanoes (tenerife, Canary Islands)

机译：评估Teide-pico Viejo Stratovolcanoes（加那利群岛的特内里费岛）未来爆炸活动的潜力

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

Since the onset of their eruptive activity within the Canadas caldera, about 180 ka ago, Teide-Pico Viejo stratovolcanoes have mainly produced lava flow eruptions of basaltic to phonoltic magmas. The products from these eruptions partially fill the caldera, and the adjacent Icod and La Orotava valleys, to the north. Although less frequent, explosive eruptions have also occurred at these composite volcanoes. In order to assess the possible evolution Teide-Pico Viejo stratovolcanoes and their potential for future explosive activity, we have analysed their recent volcanic history, assuming that similar episodes have the highest probability of occurrence in the near future. Explosive activity during the last 35000 years has been associated with the eruption of both, mafic (basalts, tephro-phonolites) and felsic (phono-tephrites and phonolites) magmas and has included strombolian, violent strombolian and sub-plinian magmatic eruptions, as well as phreatomagmatic eruptions of mafic magmas. Explosive eruptions have occurred both from central and flank vents, ranging in size from 0.001 to 0.1 km~3 for the mafic eruptions and from 0.01 to < 1 km~3 for the phonolitic ones. Comparison of the Teide-Pico Viejo stratovolcanoes with the previous cycles of activity from the central complex reveals that all them follow a similar pattern in the petrological evolution but that there is a significant difference in the eruptive behaviour of these different periods of central volcanism on Tenerife. Pre-Teide central activity is mostly characterised by large-volume (1-> 20 km~3, DRE) eruptions of phonolitic magmas while Teide-Pico Viejo is dominated by effusive eruptions. These differences can be explained in terms of the different degree of evolution of Teide-Pico Viejo compared to the preceding cycles and, consequently, in the different pre-eruptive conditions of the corresponding phonolitic magmas. A clear interaction between the basaltic and phonolitic systems is observed from the products of phonolitic eruptions, indicating that basaltic magmatism is the driving force of the phonolitic eruptive activity. The magmatic evolution of Teide-Pico Viejo stratovolcanoes will continue in the future with a probably tendency to produce a major volume of phonolitic magmas, with an increasing explosive potential. Therefore, the explosive potential of Teide-Pico Viejo cannot be neglected and should be considered in hazard assessment on Tenerife.
机译：自大约180 ka年前在加拿大破火山口开始爆发活动以来，Teide-Pico Viejo平流层火山主要产生了玄武岩至语音岩浆的熔岩流爆发。这些火山喷发的产物部分填满了火山口，以及北部的邻近艾科德河谷和拉奥罗塔瓦河谷。尽管不那么频繁，但在这些复合火山中也发生了爆炸性喷发。为了评估Teide-Pico Viejo平流层火山的可能演化及其未来爆发性活动的潜力，我们分析了它们最近的火山历史，并假设相似的事件在不久的将来发生的可能性最高。在过去的35000年中，爆炸性活动与镁铁质（玄武岩，斜方石辉石）和长英质（音辉石和方钠石）岩浆的喷发有关，其中包括粗暴，猛烈的粗暴爆发和准普林期岩浆喷发。作为基性岩浆的岩浆喷发。中央和侧面通风口都发生了爆炸性喷发，其中，黑手性喷发的喷发范围为0.001至0.1 km〜3，而胶质喷发的喷发范围为0.01至<1 km〜3。泰德峰-皮科维耶霍平流层火山与中央复合体以前的活动周期比较表明，它们在岩石演化中遵循相似的模式，但是这些不同时期的中央火山在特内里费岛的喷发行为存在显着差异。泰德峰前的中央活动主要以大范围（1-> 20 km〜3，DRE）的火山岩浆喷发为特征，而泰德峰-皮科维耶霍则以喷发性喷发为主。这些差异可以通过与之前的周期相比，泰德峰-皮科维耶霍河的不同演化程度来解释，因此可以用相应的胶质岩浆的喷发前条件不同来解释。从音系火山喷发的产物中可以观察到玄武岩和音系之间清楚的相互作用，这表明玄武岩浆作用是音系火山爆发活动的驱动力。 Teide-Pico Viejo平流层火山的岩浆演化将在未来继续，可能会产生大量的胶状岩浆，并具有爆炸性的潜力。因此，Teide-Pico Viejo的爆炸潜力不可忽略，应在特内里费岛的危害评估中予以考虑。

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