Rheology of melts from the colli albani volcanic district (Italy): a case study

Rheology of melts from the colli albani volcanic district (Italy): a case study
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阿尔巴尼山火山区(意大利)熔体的流变学:案例研究

DOI:
10.1007/s00410-020-01720-1
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发表时间:
2020
影响因子:
3.5
通讯作者:
S Fanara
S Fanara
中科院分区:
地球科学1区
文献类型:
--
作者:
Kleest C;SL Webb ;S Fanara

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在这项研究中,第一粘度测量的玻璃化转变范围内的熔体从高爆炸性的大体积喷发从科利阿尔巴尼火山区(CAVD)。岩浆是超钾质的,富含铁和CaO,特征是二氧化硅含量低(< 45重量%)。熔体组成范围从火山灰-响岩到foiditic。科利阿尔巴尼喷发出现异常,因为他们产生了大量的喷发物质,尽管他们的二氧化硅不饱和的组合物。的Colli Albani熔体的粘度变化的熔体组合物从原来的熔体发展到一个国家的岩石污染的熔体的晶体轴承熔体与液体粘度的永久性降低。传统的粘度估计假设这些岩浆具有低粘度。所提供的数据表明熔体粘度高于预期。考虑到进一步的化学或流变学特征的熔体,调查CAVD熔体是不是惊人的,因为假设与其他大体积喷发。因此,在比较大体积喷发时,考虑碱土与碱的比例以及SiO2含量可以提供一种替代方案。
In this study the first viscosity measurements in the glass transition range of melts from highly explosive large-volume eruptions from the Colli Albani Volcanic District (CAVD) are presented. The magmas are ultrapotassic, rich in iron and CaO and characterised by a low silica content (< 45 wt%). Melt compositions range from tephri-phonolitic to foiditic. The Colli Albani eruptions appear anomalous since they produced a large volume of erupted material in spite of their silica undersaturated compositions. The viscosity of the Colli Albani melt changes as the melt composition evolves from the original melt to a country-rock contaminated melt to a crystal-bearing melt with a permanent decrease in liquid viscosity. Conventional estimations of viscosities assume these magmas to have a low viscosity. The presented data show that the melt viscosities are higher than expected. Taking into account further chemical or rheological features of a melt, the investigated CAVD melts are not that striking as assumed in comparison with other large-volume eruptions. Consequently, considering the alkaline-earth to alkaline ratio together with the SiO2content could provide an alternative when comparing large volume eruptions.
DOI: 10.1130/abs/2016am-279885
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发表时间: 2017-12-25
期刊: CHEMICAL GEOLOGY
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DOI: 10.1016/j.lithos.2007.08.008
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期刊: Lithos
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