Conformity and precision of CO_2 densimetry in CO_2 inclusions : microthermometry vs.Raman micro-spectroscopic densimetry
Conformity and precision of CO_2 densimetry in CO_2 inclusions : microthermometry vs.Raman micro-spectroscopic densimetry
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CO_2包裹体中CO_2密度测定的一致性和精度:显微测温法与拉曼显微光谱密度测定法
DOI：
10.1002/jrs.3134
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发表时间：
2012
影响因子：
2.5
通讯作者：
荒井章司
中科院分区：
文献类型：
--
作者：
小林記之;山本順二;平島崇男;石橋秀巳;平野直人;Yong Lai;Vladimir S.Prikhod'ko;荒井章司
为了评估 CO2 包裹体中 CO2 流体密度测定的能力，我们比较了两种方法：显微测温法和拉曼显微光谱密度测定法。对三块地幔捕虏体中的九种CO2包裹体进行了对比实验。结果如下：（1）与显微拉曼光谱密度测定法相比，显微测温法可精确测定CO2密度，范围为0.65～1.18g/cm3； (2)显微拉曼光谱密度法与显微测温法测得的CO2密度相当一致； （3）直径小于3μm左右的CO2包裹体中，用显微测温法很难测定CO2密度； (4)显微测温法仅适用于CO2密度范围为0.65～1.18g/cm3的CO2包裹体，而拉曼显微分光密度测定法适用于CO2密度范围为0.1～1.24g/cm3的CO2包裹体。上述特征为估计幔源岩的深度成因提供了潜力。岩石被宿主岩浆捕获的深度可以使用地温测量数据和岩石中二氧化碳包裹体中的二氧化碳流体密度来估计。通过显微拉曼光谱密度测定 (~0.01 g/cm3) 和显微测温 (< 0.001 g/cm3) 获得的 CO2 包裹体中 CO2 密度的典型精度分别对应于 2.4 km 和 <1.7 km 的深度原点的不确定性。 1000 ±50 ℃。在750~1250℃和1GPa的地幔中，CO2流体的密度范围为1.06g/cm3至1.21g/cm3，拉曼显微光谱密度测定可以很好地测量到这一点。地幔矿物中二氧化碳的两种密度测量的结合阐明了地球的深层结构。版权所有 © 2012 约翰·威利父子有限公司
To assess the ability of densimetry for CO2fluid in CO2inclusions, we compare two methods, microthermometry and Raman microspectroscopic densimetry for CO2. The comparative experiment was performed for nine CO2inclusions in three mantle xenoliths. The results are as follows: (1) microthermometry precisely determines CO2density with the range of 0.65 to 1.18 g/cm3compared with Raman microspectroscopic densimetry; (2) CO2density obtained by Raman microspectroscopic densimetry is fairly consistent with that by microthermometry; (3) it is hard to determine CO2density in CO2inclusion with diameter of less than around 3 µm using microthermometry; and (4) microthermometry can be applied only to the CO2inclusion whose CO2density ranges from around 0.65 to 1.18 g/cm3, whereas the Raman microspectroscopic densimetry is applicable to CO2density ranging from 0.1 to 1.24 g/cm3. The above features carry the potential for estimation of depth origin of mantle‐derived rocks. The depth where the rocks were trapped by host magma can be estimated using both geothermometric data and CO2fluid density in CO2inclusions in the rocks. Typical precisions of density of CO2in CO2inclusions obtained by the Raman microspectroscopic densimetry (~0.01 g/cm3) and by the microthermometry (< 0.001 g/cm3) correspond to uncertainties in the depth origin of 2.4 km and < 1.7 km, respectively, at 1000 ± 50 °C. In case of the mantle under 750–1250 °C and 1 GPa, the CO2fluid has a density ranging from 1.06 g/cm3to 1.21 g/cm3, which are well measured by the Raman microspectroscopic densimetry. Combination of both densimetries for CO2in mantle minerals elucidates the deep structure of the Earth. Copyright © 2012 John Wiley & Sons, Ltd.