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在3 GPa,1 200 ℃条件下,分别以碱性玄武岩粉末和等化学计量光谱纯试剂为原料进行高温高压熔融结晶实验,对实验产物进行了电子探针测试和拉曼光谱分析,确定结晶产物为绿辉石,其拉曼谱峰的半高宽较窄且形态尖锐,表明绿辉石晶体中Si—O四面体结构稳定,矿物内部有序度高。结合前人研究成果探讨了绿辉石成因的影响因素及其原始岩浆,结果表明绿辉石的形成可能受母岩成分、体系流体含量和温压条件等多种因素影响。本实验结果为绿辉石和榴辉岩成因学研究提供可能的实验依据。 相似文献
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在1.0GPa压力条件下,采用交流阻抗谱法在10-1~106 Hz频率范围内对陕西商南地区的榴闪岩样品进行了电阻抗测量。实验结果表明,榴闪岩的复阻抗对温度和频率表现出明显的依赖性。在给定温度下,复阻抗的模随频率的增大而减小,相角随频率的增大先减小后变大;在给定频率下,复阻抗的模随温度的升高而减小,相角随温度的升高而增大。榴闪岩电导率值的范围为10-6~1S/m,并且电导率与温度之间满足Arrhenius关系式。低温区活化焓约为33~58kJ/mol,高温区活化焓约为108~163kJ/mol。榴闪岩的导电机制可能是Fe2+与Fe3+之间的电子跳跃。 相似文献
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Electrical Conductivity of Synthetic Quartz Crystals at High Temperature and Pressure from Complex Impedance Measurements
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An electrical conductivity measurement system under high-pressure conditions with a multi-anvil high-pressure apparatus by an ac complex impedance method was set up.With this system,we have successfully measured the electrical conductivity of synthetic quartz under pressure up to approximately 1.0GPa in the temperature range 661-987K.The values of electrical conductivity decrease with the increasing pressure and increase with the increasing temperature.The activation enthalpies for the α-quartz crystals are 1.10-1.28eV.The electrical conductivity of α-quartz is ionic,with Na ions moving in channels parallel to the c-axis being the predominant current carrier. 相似文献
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The electrical conductivity of molten olivine is studied up to 3720K and 13.2 GPa. The results indicate that the electrical conductivity of molten olivine exhibits the perfect Arrhenius behaviour. The activation energy as well as temperature effect is much smaller than that of the solid olivine. It is expected that the high conductivity zone in the mantle is almost independent of the melting based on our experimental data. 相似文献
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在压力为2.0和4.0 GPa、温度为373~933 K的条件下,利用交流阻抗谱仪,在0.1~106 Hz的频率范围内测量了蛇纹岩的电导率。实验结果表明:蛇纹岩的复阻抗对频率有明显的依赖性,电导率受温度的影响较大,压力对电导率的影响相对较弱;当温度为690~761 K时,蛇纹岩发生脱水,致使电导率发生突变;脱水前,蛇纹岩的活化能约为0.6 eV,脱水后则高达2 eV。根据测得的电导率和活化能,分析了蛇纹岩脱水前、后的微观导电机制。分析认为,脱水前蛇纹岩的微观导电机制可能与内部二价铁和三价铁之间的电子移动有关,脱水后则可能是离子导电。 相似文献
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