Experimental study of quartz inclusions in garnet at pressures up to 3.0 GPa: evaluating validity of the quartz-in-garnet inclusion elastic thermobarometer
Experimental study of quartz inclusions in garnet at pressures up to 3.0 GPa: evaluating validity of the quartz-in-garnet inclusion elastic thermobarometer
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压力高达 3.0 GPa 下石榴石中石英包裹体的实验研究：评估石榴石中石英包裹体弹性温压计的有效性
DOI：
10.1007/s00410-018-1469-y
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发表时间：
2018
影响因子：
3.5
通讯作者：
Spear, Frank S.
中科院分区：
文献类型：
--
作者：
Thomas, Jay B.;Spear, Frank S.
在活塞筒装置中，以氧化物为起始原料，在压力为0.5~3 Gpa，温度为700~800℃的条件下，水热结晶了具有石英包裹体的石榴石晶体，以研究捕获条件对用于石榴石(Quig)弹性温压测量的石英包裹体残余压力的影响。利用石英12 8、2 0 6和4 6 4 cm−1拉曼光谱频率的系统变化，利用描述静水压力下石英拉曼谱带漂移p-T依赖性的拉曼光谱定标，确定了石榴石中石英包裹体的压力。在分析不确定度范围内，三个拉曼频段计算的包裹体压力是相等的，这表明由石英弹性各向异性引起的非静力应力效应小于测量误差。实验中的石英包裹体的压力从− 0.351到1.247 Gpa，跨越了从天然岩石中观察到的石榴石中的石英包裹体的值范围。用石英包裹体压力来模拟包裹体捕获的P-T条件。通过考虑在实验期间测量的压力与使用已公布的石英和石榴石状态方程参数计算的压力之间的差异，对Quig温压计的准确性进行了评估。我们的实验结果表明，在室温下进行的拉曼测量可以在没有校正的情况下用来估计石榴石的结晶压力。计算的石榴石中石英包裹体的捕获压力与实验测得的压力相差小于~ 10%。由于该方法应用简单且具有相当的准确性，我们预计Quig温压计将被广泛使用来估计含石榴石硅质岩的结晶条件。
Garnet crystals with quartz inclusions were hydrothermally crystallized from oxide starting materials in piston–cylinder apparatuses at pressures from 0.5 to 3 GPa and temperatures ranging from 700 to 800 °C to study how entrapment conditions affect remnant pressures of quartz inclusions used for quartz-in-garnet (QuiG) elastic thermobarometry. Systematic changes of the 128, 206 and 464 cm−1Raman band frequencies of quartz were used to determine pressures of quartz inclusions in garnet using Raman spectroscopy calibrations that describe theP–Tdependencies of Raman band shifts for quartz under hydrostatic pressure. Within analytical uncertainties, inclusion pressures calculated for each of the three Raman band frequencies are equivalent, which suggests that non-hydrostatic stress effects caused by elastic anisotropy in quartz are smaller than measurement errors. The experimental quartz inclusions have pressures ranging from − 0.351 to 1.247 GPa that span the range of values observed for quartz inclusions in garnets from natural rocks. Quartz inclusion pressures were used to modelP–Tconditions at which the inclusions could have been trapped. The accuracy of QuiG thermobarometry was evaluated by considering the differences between pressures measured during experiments and pressures calculated using published equation of state parameters for quartz and garnet. Our experimental results demonstrate that Raman measurements performed at room temperature can be used without corrections to estimate garnet crystallization pressures. Calculated entrapment pressures for quartz inclusions in garnet are less than ~ 10% different from pressures measured during the experiments. Because the method is simple to apply with reasonable accuracy, we expect widespread usage of QuiG thermobarometry to estimate crystallization conditions for garnet-bearing silicic rocks.
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影响因子：
--
作者：
BOYD, FR;ENGLAND, JL
通讯作者：
ENGLAND, JL
希腊锡弗诺斯岛蓝片岩单元的反应超越和峰值 P-T 条件的重新评估：对基克拉泽斯俯冲带的影响
影响因子：
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作者：
Castro, Adrian E.;Spear, Frank S.
通讯作者：
Spear, Frank S.
氧化物矿物的拉曼研究：方石英相的回顾
DOI：
10.1088/0953-8984/19/27/275201
发表时间：
2007
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
["Ming Zhang
通讯作者：
["Ming Zhang
影响因子：
3.5
作者：
Ashley, Kyle T.;Darling, Robert S.;Law, Richard D.
通讯作者：
Law, Richard D.
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影响因子：
2.9
作者：
J. Rosenfeld
通讯作者：
J. Rosenfeld