Influence of CO2 on the rheology of melts from the Colli Albani Volcanic District (Italy): foidite to phonolite
Influence of CO2 on the rheology of melts from the Colli Albani Volcanic District (Italy): foidite to phonolite
复制标题
CO2 对科利阿尔巴尼火山区（意大利）熔体流变学的影响：从 foidite 到 phonolite
DOI：
10.1007/s00410-021-01838-w
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发表时间：
2021
影响因子：
3.5
通讯作者：
SL Webb
中科院分区：
文献类型：
--
作者：
Kleest C ;SL Webb
在这项研究中，CO2对二氧化硅贫和富钾熔体的高爆炸性喷发从科利阿尔巴尼火山区（意大利）（CAVD）的流变学的影响进行了首次测量。研究的熔体范围从foidite到tephri-phonolite，从CAVD到维苏威火山（意大利）的phonolite，CO2浓度高达0.50重量%。粘度和量热测量在600 - 780 °C的玻璃化转变温度范围内进行。虽然名义上无水，调查熔体含有H2O浓度高达0.23重量%。数据显示粘度降低约1.5%。100.40Pa s的响岩组合物与~ 0.07重量%的CO2和aT减少了约。14 °C。对于凝灰岩组成，Tgis约。对于含有~ 0.5wt%CO2的样品，粘度降低了100.25Pa s。热量测量的tephri-phonolite显示降低约Tg的开始。6 °C的熔体与~ 0.11重量%的CO2和Tg的foidite似乎不受CO2浓度的~ 0.37重量%的CO2。然而，这些热质-声子状和foiditic熔体在量热测量期间发泡，从而阻止可靠的测量。看来，这种整体粘度下降的大部分是由熔体中少量的H2O引起的，CO2略微降低粘度或对粘度没有影响。此外，它表明，粘度的降低随着所研究的熔体的解聚程度的增加而降低。因此，CAVD喷发的爆发方式主要是由于岩浆在储存和上升过程中形成和上升的晶体和气泡增加了岩浆的粘度，而熔体中的CO2则略微降低了粘度。
In this study, the influence of CO2on the rheology of silica poor and K-rich melts from highly explosive eruptions from the Colli Albani Volcanic District (Italy) (CAVD) is measured for the first time. The investigated melts range from foidite to tephri-phonolite to tephrite from the CAVD to a phonolite from the Vesuvius (Italy) with CO2concentrations up to 0.50 wt%. Viscosity and calorimetric measurements are performed in the glass transition rangeTgbetween 600 and 780 °C. Although nominally anhydrous, the investigated melts contain H2O concentrations up to 0.23 wt%. The data exhibit a decrease in viscosity of approx. 100.40Pa s for the phonolitic composition with ~ 0.07 wt% CO2and aTgreduced by approx. 14 °C. For the tephritic composition,Tgis approx. 5 °C lower and has a viscosity reduced by 100.25Pa s for the sample containing ~ 0.5 wt% CO2. Calorimetric measurements of the tephri-phonolite show lowered onset ofTgby approx. 6 °C for the melt with ~ 0.11 wt% CO2andTgof the foidite appears not to be influenced by a CO2concentration of ~ 0.37 wt% CO2. However, these tephri-phonolitic and foiditic melts foamed during calorimetric measurements preventing a reliable measurement. It would appear that most of this overall drop in viscosity is caused by the small amounts of H2O in the melts with CO2slightly reducing the viscosity or having no effect on viscosity. Additionally, it is shown that the reduction in viscosity decreases with an increasing degree of the depolymerisation for the investigated melts. Consequently, the explosive style of the CAVD eruptions is mainly caused by crystals and bubbles which form and rise during magma storage and ascent which increases the magma viscosity whereas the CO2in the melt slightly reduces the viscosity.
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影响因子：
2.1
作者：
Y. Morizet;A. Nichols;S. Kohn;R. Brooker;Donald Bruce Dingwell
通讯作者：
Y. Morizet;A. Nichols;S. Kohn;R. Brooker;Donald Bruce Dingwell
含铁Na2O-Al2O3-SiO2熔体的结构和流变学
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
S. Webb
通讯作者：
S. Webb
硅酸盐熔体的结构弛豫和地质过程中的非牛顿熔体流变学
DOI：
--
发表时间：
1989
期刊：
影响因子：
--
作者：
Donald Bruce Dingwell;S. Webb
通讯作者：
S. Webb
流纹岩黑曜石中的焓和剪切应力松弛的等效性以及火山过程中液体玻璃化转变的量化
DOI：
--
发表时间：
1995
期刊：
影响因子：
--
作者：
R. Stevenson;Donald Bruce Dingwell;S. Webb;N. Bagdassarov
通讯作者：
N. Bagdassarov
CO2-H2O 在富钾酚醛石和白榴石熔体中的溶解度
影响因子：
3.5
作者：
Max Schanofski;S. Fanara;B. Schmidt
通讯作者：
B. Schmidt