Viscosity of Palmas-type magmas of the Paraná Magmatic Province (Rio Grande do Sul State, Brazil): Implications for high-temperature silicic volcanism
Viscosity of Palmas-type magmas of the Paraná Magmatic Province (Rio Grande do Sul State, Brazil): Implications for high-temperature silicic volcanism
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巴拉那岩浆省（巴西南里奥格兰德州）帕尔马斯型岩浆的粘度：对高温硅质火山作用的影响
DOI：
10.1016/j.chemgeo.2020.119981
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Dingwell DB
中科院分区：
文献类型：
--
作者：
Giordano D;Vona A;Gonzalez-Garcia D;Allabar A;Kolzenburg S;Polo L;De Assis Janasi V;Behrens H;De Campos C;De Cristofaro SP;Guimaraes LF;Nowak M;Müller D;Günther A;Masotta M;Roverato M;Romano C;Dingwell DB
本文提供了与南卡西亚斯和圣玛丽亚火山喷发序列的代表性火山产物有关的流纹岩和英安岩浆纯液体粘度与温度和H2O含量关系的新参数。测定了圣玛丽亚流纹岩(SMR)、Caxias do Sul(CSD)和Barros Cassal(BCD)喷发序列(巴拉那-埃滕代卡大火成岩省下白垩统火山作用)的硅质火山产物在约1600℃到玻璃化转变(Tg)的温度范围内的粘度。在超液相线区域，用同心圆筒粘度计测定了主要喷发序列中代表性样品的无水熔体粘度。然后，使用内部加热的压力容器将SMR和CSD的淬火产品水化，生成两套样品，通过卡尔·费舍尔滴定(KFT)测定，这些样品的可变水分含量分别高达4.41(CSD)和5.27(SMR)wt%。最后，用无水和有水的样品测量了玻璃化温度附近的微渗透粘度。这两种类型的样品都显示了通过拉曼光谱鉴定的少量Fe-Ti氧化物纳米沸石，这些纳米沸石的存在基本上不会干扰粘度的测定。根据粘度测量的结果，我们使用以下沃格尔·富尔彻·塔曼(VFT)公式将粘度依赖于水分和温度的关系参数化为水分含量的函数：对于CS.，LOGη=−4.55C+(10065-176×H2O)/[T-(34.6F+375.3/(1F+H2O))]对于CS.，η是以PA S为单位的粘度。T绝对温度和H2O表示溶解水含量，单位为wt%。这种新的参数化方案似乎解决了与H2O影响的主要描述参数变化相关的一些不一致问题，改进了以前的一些参数化方案的性能。这些结果对于这里研究的英安岩和流纹岩产品在高于Tg的温度下，在上升和喷发期间以及在流动、就位和焊接过程中存在的条件是有用的。
This paper provides a new parameterization of the temperature and H2O content dependence of the pure liquid viscosities of rhyolitic and dacitic magmas associated with representative volcanic products of the Caxias do Sul and Santa Maria eruptive sequences. The viscosities of silicic volcanic products from the Santa Maria rhyolite (SMr), Caxias do Sul (CSd) and Barros Cassal (BCd) eruptive sequences (Lower Cretaceous volcanism of Parana-Etendeka Large Igneous Province) were measured in the temperature range from ca. 1600 °C to the glass transition (Tg). Anhydrous melt viscosities of representative samples from the main eruptive sequences were determined via concentric cylinder viscometry in the superliquidus regime. The quench products of SMr and CSd were then hydrated using an Internally Heated Pressure Vessel to generate two suites of samples with variable water content of up to 4.41 (CSd) and 5.27 (SMr) wt% as determined by Karl Fischer Titration (KFT). Finally, both anhydrous and hydrous samples were used for micropenetration viscosity measurements near Tg. Both types of samples show a minor amount of Fe-Ti-oxide nanolites identified via Raman spectroscopy, which presence did not substantially interfere with viscosity determinations. Based on the results of the viscosity measurements we parameterized the viscosity dependence as a function of water content using the following Vogel Fulcher Tammann (VFT) expressions accounting for the water and temperature dependence of the viscosity:logη = −4.55 + (10065–176*H2O)/[T-(34.6 + 375.3/(1 + H2O))] for SMr.andlogη = −4.55 + (9213–338.1*H2O)/[T-(148.5 + 301.3/(1 + H2O))] for CSd.where η is the viscosity in Pa s, T the absolute temperature and H2O the dissolved water content in wt%. This novel parameterization appears to solve a few inconsistencies associated with the variation of the main descriptive parameters of the effect of H2O, improving the performance of some previous parameterizations. These results are useful for scaling to the conditions extant during ascent and eruption and during flow, emplacement and welding, at temperatures above Tg, for the dacitic and rhyolitic products investigated here.
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