火山喷发期间玄武岩熔体化学成分的分异:以托尔巴克-夏威夷断裂带和埃特纳喷口为例

IF 0.8 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES
Irina Mikhailovna Gembitskaya, Benedict Kinshasa Pharoe
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引用次数: 0

摘要

在反映岩浆喷发早期实时条件的模拟温度/压力(T/P)条件下,对Etna、Tolbachik和夏威夷断裂带的淬灭火山岩化学成分分异进行了研究。模拟是在高压室设备下进行的,然后岩石受到高T/P条件导致玄武岩融化。通过仪器调节不同的温度和压力条件,以允许不同的岩浆冷却和结晶速率。利用扫描电子显微镜(SEM)和能谱分析(EDS-microanalysis)对淬火玻璃进行了研究,目的是根据熔体结构的微观非均质性来确定主要元素的分配。对实验熔体的微观研究以及在电子显微镜下与天然熔体的比较表明,根据其化学成分(组成熔体),存在两种不同的液体在冷却过程中分馏:Fe, Mg液体集中在熔体的低聚合和流动部分,K, Na和Al液体集中在熔体的高聚合部分。Ca和Si的分配似乎是可变的,更多地取决于体熔体成分。在爆炸后急淬火和高压条件下,非结晶熔体分馏明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Differentiation of Chemical Components in Basaltic Melts During Eruptions: An Example from Tolbachik–Hawaiian Fissure Zones and Etna Vent

Differentiation of Chemical Components in Basaltic Melts During Eruptions: An Example from Tolbachik–Hawaiian Fissure Zones and Etna Vent

The study on differentiation of chemical components in quenched volcanics from the Etna, Tolbachik and Hawaiian fissure zones was carried out under simulated temperature/pressure (T/P) conditions reflecting real-time conditions in the early stages of magmatic eruptions. The simulation was performed under high-pressure chamber apparatus, and the rocks were then subjected to high T/P conditions resulting in basaltic melts. Various temperature and pressure conditions were adjusted from the apparatus to allow for different rates of magmatic cooling and crystallization. The scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS-microanalysis) was then used to study the quenched glasses with the aim of identifying major element partitioning based on micro-heterogeneity of melts structures. The microscopic study of the experimental melts and their comparisons with natural melts under the electron microscopes indicate the existence of two distinct liquids which fractionated during cooling on the basis of their chemical composition (compositional melts): Fe, Mg liquids concentrated in the poorly polymerized and mobile parts of the melt and K, Na and Al liquids were concentrated in more highly polymerized parts of the melts. Partitioning of Ca and Si appears to be changeable and more dependent on bulk melt composition. Fractionation of non-crystalline melts was evident under post-explosion sharp quenching and high-pressure conditions.

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来源期刊
CiteScore
2.60
自引率
0.00%
发文量
37
审稿时长
>12 weeks
期刊介绍: To promote research in all the branches of Science & Technology; and disseminate the knowledge and advancements in Science & Technology
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