In situ spectroscopic study of the thermodynamic properties of water-bearing magmas
含水岩浆热力学性质的原位光谱研究
基本信息
- 批准号:11640480
- 负责人:
- 金额:$ 2.24万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1999
- 资助国家:日本
- 起止时间:1999 至 2000
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The goal of this research was to quantify the thermodynamic properties of water dissolved in silicate melts. Water is a major volatile component dissolved in magma at depth, and is capable of nearly complete exsolution from the melt (but being sustained in the melt as vapor bubbles) when the magma rises to near the surface. This causes a progressive increase of the volume per unit mass of the rising magma and a modification of the cooling path. Knowledge of the thermodynamic properties of water in silicate melts is critical for modeling these effects, and thus fundamental for understanding the dynamics of magma migration and eruption. Two major advances in the quantification of the thermodynamic properties of water in silicate melts have been achieved through this research: (1) High temperature infrared absorption peaks due to OH group and H2O molecule were measured in two basalt glasses (one containing 1.3 wt% water, one containing 2.9 wt% water; the anhydrous composition remains unch … More anged) as a function of temperature between 〜 25℃ and 575℃. The concentrations of OH group and H2O molecule were determined using the room-temperature calibrations of the molar absorption coefficients. The results show that both OH group and H2O molecule are equilibrium species in the melts, which is consistent with the idea that water is incorporated in a silicate melt through homogeneous reaction H2O molecule + O = 2OH. The product is favored by increase of temperature above the glass transition, and the homogeneous reaction equilibria in these two melts show a good agreement with each other; an equation 1n K = -4070(±470)/T + 3.68(±0.60) reproduces both. The 1n K values obtained in the melts are not distinguishable from those obtained by previous studies in rhyolitic melts within experimental uncertainty. This suggests that there is little influence of composition on the calorimetric properties of the homogeneous reaction equilibria in natural magmatic melts. (2) Heat of solution of water in rhyolite melts was thermodynamically modeled, on the basis of the temperature dependence of water solubility in the melts obtained from infrared spectroscopy of the quenched glasses. In the model developed here, water was assumed to be dissoleved through a coupled reaction H2O molecule melt + O melt = 2OH melt (homogeneous reaction) and H2O vapor = H2O molecule melt (heterogeneous reaction), and ideal mixing of these melt components was assumed. A non-linear multiple regression to the solubility dataset converged upon ΔH° homo (P, T) = 25.8±11.8 kJ, ΔS° homo (P, T) = 6.0±8.7 J/K, and, ΔH° hetero (1bar, T) = -25.3±4.8 kJ/mol. From these optimum values, the following interpretations can be made: The heat of solution is approximately zero at 0.1 MPa, and increases with pressure below 〜 20 MPa, where the absolute value of the heat is negative. At pressures between 〜 20 MPa and 100 MPa, the heat of solution roughly levels out (〜 -7±6 kJ/mol at 850℃) as a result of the balance of the exothermic heterogeneous reaction and endothermic homogeneous reaction. Although error of estimation is large, the present results suggest that at pressures of 10 to 100 MPa (the pressure range important to closed system magma bubbling), the calorimetric effect of bubbling causes a temperature drop of only <10℃. Less
本研究的目的是量化的水溶解在硅酸盐熔体的热力学性质。水是溶解在岩浆深处的主要挥发性成分,并且当岩浆上升到接近表面时,能够从熔体中几乎完全出溶(但在熔体中以蒸汽泡的形式存在)。这将导致体积的每单位质量的上升岩浆和修改的冷却pathway. Knowledge的水在硅酸盐熔体的热力学性质的逐步增加是至关重要的模拟这些影响,从而了解岩浆迁移和喷发的动力学基础。通过本研究,在硅酸盐熔体中水的热力学性质定量化方面取得了两个主要进展:(1)在两种玄武岩玻璃(一种含水1.3wt%,一种含水2.9wt%;无水组成保持在1.3wt%,另一种含水2.9wt%;无水组成保持在1.3wt%,一种含水2.9wt%,一种含水 ...更多信息 在125 ℃和575℃之间变化)。OH基团和H2O分子的浓度使用摩尔吸光系数的室温校准来确定。结果表明,在熔体中,OH基团和H2O分子均为平衡态,这与水通过H2O分子+ O = 2 OH的均相反应进入硅酸盐熔体的观点相一致。温度升高到玻璃化转变温度以上有利于产物的生成,两种熔体的均相反应平衡表现出良好的一致性,方程1 n K = -4070(±470)/T + 3.68(±0.60)再现了两者。在熔体中获得的1 n K值是无法区分的流纹质熔体中的实验不确定性内通过以前的研究所获得的。这表明,在天然岩浆熔体中,成分对均相反应平衡的量热性质影响不大。(2)根据淬火玻璃的红外光谱得到的流纹岩熔体中水溶解度的温度依赖性,建立了流纹岩熔体中水溶解热的热力学模型。在这里开发的模型中,水被假定为溶解通过耦合反应H2O分子熔体+ O熔体= 2 OH熔体(均相反应)和H2O蒸汽= H2O分子熔体(非均相反应),并假设这些熔体组分的理想混合。溶解度数据集的非线性多元回归收敛于ΔH° homo(P,T)= 25.8±11.8 kJ,ΔS° homo(P,T)= 6.0±8.7 J/K,ΔH° hetero(1bar,T)= -25.3 ~4.8 kJ/mol。根据这些最佳值,可以做出以下解释:溶解热在0.1 MPa时近似为零,并且随着压力的增加而增加,低于200 MPa时,热量的绝对值为负值。在压力为100 ~ 200 MPa范围内,由于多相反应放热与均相反应吸热平衡,溶解热大致趋于稳定(850℃时为100 ~ 706 kJ/mol)。虽然估计误差很大,但目前的结果表明,在10至100 MPa的压力范围内(压力范围对封闭系统岩浆起泡很重要),起泡的量热效应引起的温度下降仅<10℃。少
项目成果
期刊论文数量(5)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Yamashita, S: "Heat of solution of water in rhyolite melt : constraints from water solubility measurements"EOS. 81. S433-S433 (2000)
Yamashita,S:“流纹岩熔体中水的溶解热:水溶性测量的限制”EOS。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Yamashita, S.: "Heat of solution of water in rhyolite melt: constraints from water solubility measurements."EOS. 81. S433 (2000)
Yamashita, S.:“流纹岩熔体中水的溶解热:水溶性测量的限制。”EOS。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
山下 茂: "珪酸塩ガラス中の水の顕微赤外分光分析〜マグマ研究への応用"Jasco Report. 41・2. 15-18 (1999)
Shigeru Yamashita:“硅酸盐玻璃中水的微红外光谱分析 - 在岩浆研究中的应用”Jasco Report 41・2(1999)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Yamashita, S: "Experiment study of the effect of temperature on water solubility in natural rhyolite melt to 100 MPa"Journal of Petrology. 40. 1497-1507 (1999)
Yamashita,S:“温度对 100 MPa 天然流纹岩熔体中水溶性影响的实验研究”岩石学杂志。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Yamashita, S.: "Micro-IR spectroscopy of water-bearing silicate glasses: an application to experimental petrology."Jasco Report. 41(in Japanese). 15-18 (1999)
Yamashita, S.:“含水硅酸盐玻璃的微红外光谱:在实验岩石学中的应用。”Jasco 报告。
- DOI:
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YAMASHITA Shigeru其他文献
Optimization Problems in Quantum Circuit Design
量子电路设计中的优化问题
- DOI:
10.1587/essfr.14.4_337 - 发表时间:
2021 - 期刊:
- 影响因子:0
- 作者:
Tohma Kawasumi;Ryota Tamura;Yuya Asada;Jixin Han;Hiroki Mikami;Keiji Kimura ;Hironori Kasahara;YAMASHITA Shigeru - 通讯作者:
YAMASHITA Shigeru
Reduction of Quantum Cost by Making Temporary Changes to the Function
通过临时更改功能来降低量子成本
- DOI:
10.1587/transinf.2016edp7397 - 发表时间:
2017 - 期刊:
- 影响因子:0.7
- 作者:
AIN BINTI ADNAN Nurul;YAMASHITA Shigeru;MISHCHENKO Alan - 通讯作者:
MISHCHENKO Alan
YAMASHITA Shigeru的其他文献
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{{ truncateString('YAMASHITA Shigeru', 18)}}的其他基金
Hardware Design Methodology to Utilize Next-Generation Device That May Not Work Properly
利用可能无法正常工作的下一代设备的硬件设计方法
- 批准号:
15H02679 - 财政年份:2015
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$ 2.24万 - 项目类别:
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Development the lesson program of fostering the ability to carry out the classwork to conduct experiments in science subject
制定培养科学科目课堂作业实验能力的课程计划
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In situ observation of magma at upper mantle conditions
上地幔条件下岩浆的原位观测
- 批准号:
24540514 - 财政年份:2012
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Design Methodology for Dependable Logic Circuits with Small Overhead
开销较小的可靠逻辑电路的设计方法
- 批准号:
23300019 - 财政年份:2011
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
In-situ spectroscopic observation of magma and water fluid at high temperature and high pressure
高温高压岩浆和水流体的原位光谱观测
- 批准号:
21340161 - 财政年份:2009
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Efficient Quantum Circuit Design Methods Considering Error Correction
考虑纠错的高效量子电路设计方法
- 批准号:
19700010 - 财政年份:2007
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$ 2.24万 - 项目类别:
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The study of the handwriting input system in the cooperation learning support
手写输入系统在合作学习支持中的研究
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Construction of the On-demand Library to Support the Information Education in an Area
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13680243 - 财政年份:2001
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$ 2.24万 - 项目类别:
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In Situ tests to Determine the Ground Pressure Existing in a Soft Rock Mass by Use of Hydraulic Borehole Cells.
使用液压钻孔单元确定软岩体中存在的地面压力的现场测试。
- 批准号:
08555254 - 财政年份:1996
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$ 2.24万 - 项目类别:
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Deformational behavior and change of micro-fabric of rocks in creep
岩石蠕变变形行为及微结构变化
- 批准号:
08455480 - 财政年份:1996
- 资助金额:
$ 2.24万 - 项目类别:
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