...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Contributions to Mineralogy and Petrology >Volatile content and degassing processes in the AD 79 magma chamber at Vesuvius (Italy)
【24h】

Volatile content and degassing processes in the AD 79 magma chamber at Vesuvius (Italy)

机译：维苏威火山（意大利）AD 79岩浆室内的挥发物含量和脱气过程

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

The evolution of volatiles in the AD 79 magma chamber at Vesuvius (Italy) was investigated through the study of melt inclusions (MI) in crystals of different origins. FTIR spectroscopy and EMPA were used to measure H_2O, CO_2, S and Cl of the different melts. This allowed us to define the volatile content of the most evolved, phonolitic portion of the magma chamber and of the mafic melts feeding the chamber. MI in sanidine from phonolitic and tephri-phonolitic pumices show systematic differences in composition and volatile content, which can be explained by resorption of the host mineral during syn-eruptive mixing. The pre-eruption content of phonolitic magma appears to have been dominated by H_2O and Cl (respectively 6.0 to 6.5 wtpercent and 6700 ppm), while magma chamber refilling occurred through the repeated injection of H_2O, CO_2 and S-rich tephri tic magmas (respectively 3percent, 1500 ppm and 1400 ppm). Strong CO_2 degassing probably occurred during the decompressional path of mafic batches towards the magma chamber, while sulphur was probably released by the magma following crystallization and mixing processes. Water and chlorine strongly accumu-lated in the magma and reached their solubility limits only during the eruption. Chlorine solubility appears to have been strongly compositionally controlled, and Cl release was inhibited by groundmass crystallization of leucite, which shifted the composition of the residual liquid towards higher Cl solubilities.
机译：通过研究不同来源的晶体中的熔体包裹体（MI），研究了维苏威（意大利）AD 79岩浆室内挥发物的演变。 FTIR光谱和EMPA用于测量不同熔体的H_2O，CO_2，S和Cl。这使我们能够定义岩浆腔室中发展最快的，音质最硬的部分以及向腔室中送入的铁镁质熔体的挥发物含量。磺酸盐和邻苯二甲酸盐-盐溶液中的山梨糖苷中的MI显示出系统的组成和挥发物含量差异，这可以通过协同混合过程中主体矿物的吸收来解释。胶质岩浆的喷发前含量似乎主要由H_2O和Cl所控制（分别为6.0至6.5 wt％和6700 ppm），而岩浆室的充填是通过反复注入H_2O，CO_2和富S的色母岩浆（分别3％，1500 ppm和1400 ppm）。镁铁矿向岩浆室的减压过程中可能发生强烈的CO_2脱气，而结晶和混合过程之后，岩浆可能释放出硫。水和氯在岩浆中强烈积累，仅在喷发期间才达到溶解度极限。氯的溶解度似乎已受到严格的成分控制，Cl的释放被白榴石的底质结晶抑制，这使残留液体的组成向更高的Cl溶解度转移。

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