...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >MgO partition between olivine and K_2O-rich silicate melt: Geothermometers applicable to high potassium magmas
【24h】

MgO partition between olivine and K_2O-rich silicate melt: Geothermometers applicable to high potassium magmas

机译：橄榄石和富含K_2O的硅酸盐熔体之间的MgO分区：适用于高钾岩浆的地热仪

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

Potassium and ultrapotassium magmas with potential origins in the upper mantle are common and widely distributed on the Earth. Previous experimental studies have suggested that K can significantly decrease the partial melting T of the peridotite. Since K has a strong effect on the melt composition, and on the molar partition coefficient of some cations such as Mg between the olivine and melt, D-Mg(Ol/liq), it can substantially affect the T estimation of the Ol geothermometers. However, none of the presently available geothermometers have critically considered the effect of K in this paper, we have collected a large number of composition data of the Ol-melt equilibrium pairs covering a large range of K2O contents in the melts, and have successfully calibrated three K2O-dependent geothermometers on the basis of the MgO partition between the Ol and basaltic magma, two Ol geothermometers and one melt composition geothermometer. The database covers the P range from 1 atm to 7 GPa and T range of 1087-1950 degrees C. Compared to some other geothermometers, our Ol geothennometers reproduce the experimental T very well, with the average of the absolute differences between the calculated T and experimental T being only 14(15) degrees C at room P and 25(21) degrees C at high P, and with these differences showing no clear dependence on the P, T, and contents of K2O and any other oxides in the melts. Furthermore, our melt composition geothermometer allows excellent T estimate for the silicate magma coexisting with Ol by using the melt composition alone. The application of our melt composition geothermometer to the Somma-Vesuvius volcanic complex in Italy demonstrates that this geothermometer can lead to reasonable T estimates for the high potassium silicate magmas, even there are small amounts of volatiles such as H2O and CO2 in the melts.
机译：潜在起源于上地幔的钾和超钾岩浆很普遍，并广泛分布在地球上。先前的实验研究表明，钾可以显着降低橄榄岩的部分熔融T。由于K对熔体成分以及对某些阳离子（例如橄榄石和熔体之间的Mg）的摩尔分配系数D-Mg（Ol / liq）都有很强的影响，因此它会大大影响Ol地热仪的T估计。但是，目前没有可用的地热仪在本文中严格考虑过K的影响，我们已经收集了涵盖熔体中大量K2O含量的大量Ol-熔体平衡对的组成数据，并已成功进行了校准基于Ol和玄武岩浆之间的MgO分区，三个基于K2O的地热仪，两个Ol地热仪和一个熔体成分地热仪。该数据库涵盖了从1 atm到7 GPa的P范围和1087-1950摄氏度的T范围。与其他一些地热仪相比，我们的Ol地热仪很好地再现了实验T，计算出的T和T之间的绝对差的平均值为平均值实验温度T在室温P下仅为14（15）摄氏度，在高P下仅为25（21）摄氏度，并且这些差异表明对P，T以及熔体中K2O和任何其他氧化物的含量没有明显的依赖性。此外，我们的熔体成分地热仪通过单独使用熔体成分，可以很好地估算与Ol共存的硅酸盐岩浆的T值。将我们的熔体成分地热仪应用于意大利的Somma-Vesuvius火山综合体表明，即使在熔体中存在诸如H2O和CO2等少量挥发物的情况下，该地热仪也可以对高硅酸钾岩浆产生合理的T估计值。

著录项

相似文献

  • 外文文献
  • 中文文献
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