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1.
Haiying Hu Lidong Dai Heping Li Jianjun Jiang Keshi Hui 《Mineralogy and Petrology》2014,108(5):609-618
Electrical conductivity measurements on dry polycrystalline K-feldspar were performed at 1.0 to 3.0 GPa and 873 to 1,173 K with a multi-anvil high-pressure apparatus and the Solartron-1260 Impedance/Gain Phase Analyzer in the frequency range of 10?1 to 106 Hz. At each temperature the complex impedance displays a perfect semi-circular arc that represents the grain-interior conduction. Under the experimental conditions, electrical conductivity exponentially increases with increasing temperature and slightly decreases with increasing pressure; however, the effect of pressure on the conductivity is less pronounced than that of temperature. The activation enthalpy decreases slightly from 0.99 to 1.02 eV with increasing pressure, and the activation energy and activation volume for K-feldspar are 0.98 eV and 1.46?±?0.17 cm3/mol, respectively. According to these Arrhenius parameters, ionic conduction is proposed to be the dominant conduction mechanism in K-feldspar at high temperatures and pressures, and potassium ions are the charge carriers transporting by an interstitial mechanism. The diffusion coefficient of potassium at high temperatures was calculated from our conductivity data on K-feldspar using Nernst–Einstein equation, and the results were compared with the previous experimental results. 相似文献
2.
香炉碗子金矿床产于韧性剪切带内,具有多期成矿的特点。矿床成因属浅成低温热液—蚀变岩型金矿床。黄铁矿形成于两个成矿阶段。早期黄铁矿含金量较少,其晶体形态主要为{hko}、{hko}+{100}。晚期黄铁矿以富含金为特征,主要为它形晶,呈细脉浸染状产出。黄铁矿的热电性特征可作为金矿的找矿标志。利用成矿阶段形成的黄铁矿所求出的产矿系数可以圈定矿体。其产矿系数<4010×10~(-2)者为工业矿体。 相似文献
3.
Lidong?Dai Heping?LiEmail author Haiying?Hu Shuangming?Shan Jianjun?Jiang Keshi?Hui 《Contributions to Mineralogy and Petrology》2012,163(4):689-700
The in situ electrical conductivity of hydrous garnet samples (Py20Alm76Grs4–Py73Alm14Grs13) was determined at pressures of 1.0–4.0 GPa and temperatures of 873–1273 K in the YJ-3000t apparatus using a Solartron-1260
impedance/gain-phase analyzer for various chemical compositions and oxygen fugacities. The oxygen fugacity was controlled
by five solid-state oxygen buffers (Fe2O3 + Fe3O4, Ni + NiO, Fe + Fe3O4, Fe + FeO, and Mo + MoO2). Experimental results indicate that within a frequency range from 10−2 to 106 Hz, electrical conductivity is strongly dependent on signal frequency. Electrical conductivity shows an Arrhenius increase
with temperature. At 2.0 GPa, the electrical conductivity of anhydrous garnet single crystals with various chemical compositions
(Py20Alm76Grs4, Py30Alm67Grs3, Py56Alm43Grs1, and Py73Alm14Grs13) decreases with increasing pyrope component (Py). With increasing oxygen fugacity, the electrical conductivity of dry Py73Alm14Grs13 garnet single crystal shows an increase, whereas that of a hydrous sample with 465 ppm water shows a decrease, both following
a power law (exponents of 0.061 and −0.071, respectively). With increasing pressure, the electrical conductivity of this hydrous
garnet increases, along with the pre-exponential factors, and the activation energy and activation volume of hydrous samples
are 0.7731 ± 0.0041 eV and −1.4 ± 0.15 cm3/mol, respectively. The results show that small hopping polarons
( \textFe\textMg · ) \left( {{\text{Fe}}_{\text{Mg}}^{ \cdot } } \right) and protons (
\textH · {\text{H}}^{ \cdot } ) are the dominant conduction mechanisms for dry and wet garnet single crystals, respectively. Based on these results and
the effective medium theory, we established the electrical conductivity of an eclogite model with different mineral contents
at high temperatures and high pressures, thereby providing constraints on the inversion of field magnetotelluric sounding
results in future studies. 相似文献
4.
高温高压下矿物岩石电导率的实验研究数据,不仅是人们了解地球内部物质组成及其演化过程的重要窗口,而且可以为野外大地电磁测深和地磁测深反演提供重要约束.重点介绍了温度、压力、水含量、铁含量、氧逸度、熔融等矿物岩石电导率的影响因素,深入阐述了存在于矿物岩石的4种主要导电机制,即离子、质子、小极化子和大极化子.回顾近年来地壳主要造岩矿物(长石、石英和辉石)的电导率实验研究取得的新成果,讨论了它们的导电机制和地球物理意义,并对其目前存在的问题及尚需进一步展开的工作进行了探讨. 相似文献
5.
安可士 《华北地质矿产杂志》1994,9(4):341-346
本文主题为饮用天然矿泉水。碳酸矿泉水，硅酸矿泉水，锶矿泉水是我国饮用天然矿泉水的主要类型，约占全国已发现矿泉水的９５％。矿泉水主要生产国及消费国都在欧洲。亚洲的日本、韩国等国的矿泉水的产量也在大幅度增长。而我国矿泉水产量近年也以较大的速度增长，但只有名牌产品才有可观的经济效益。 相似文献
6.
An Keshi 《GeoJournal》1980,4(6):507-513
Since the founding of the New China, the development and utilization of thermal spring resources in China have made rapid progress. Efforts were mainly devoted to the utilization of thermal springs in medical services before the end of the sixties. Since the 70's development of geothermal resources directed to multipurpose use in industry and agriculture has emerged with great vigour, with investigation and prospection of thermal springs undertaken in over two thirds of the provinces in China. Special geothermal exploration have been carried out in big cities where there are no natural thermal springs, and geothermal water has been found in city areas such as Beijing, Tianjin, Xian and Kunmin. In addition, hundreds of drill wells have tapped thermal water in the course of exploration and development of oil-gas fields.The present paper discusses the distribution and formation of thermal springs in China on the basis of the enormous data, unpublished data in particular, accumulated in the course of the above-mentioned effort.The author of this article wishes to express his sincere gratitude to the many organizations and colleagues for their numerous data and valuable suggestions and comments provided during the preparation of this article. 相似文献
7.
应用医疗ＣＴ扫描法观察恐龙蛋化石，可清晰地分辨出卵形，卵壳，卵蛋白，卵黄及充填的矿物等结构，并可测出各部具体数据，为恐龙蛋化石的研究开辟了一个新的途径。 相似文献
8.
河北省灵寿县土岭、石湖金矿赋存于太古代阜平群变质岩系中。矿体严格受构造破碎带制约,控矿构造具有多期性、复合性特点。岩浆岩发育,麻棚岩体属I型花岗岩,其金的丰度值为9.7ppb。硫、碳、氧和铅同位素特征反应成矿热液来源于岩浆岩。黄铁矿中Co/Ni为2.59,Au/Ag<0.5。成矿温度190～373℃。石英包裹体成分中Cl~->F~-,Na~+>K~+。金可能以[AuCl_2]~-、[AuCl_4]~-或[AuS]~-、[AuS_2]~-等络合物形式迁移。太行山区土岭、石湖金矿床为岩浆期后热液脉型金矿床。 相似文献
9.
太行山区土岭、石湖金矿区地球化学及其找矿标志 总被引：5，自引：0，他引：5
本文讨论了土岭、石湖金矿区与成矿有关的地质体的地球化学特征及其找矿标志。认为该矿区成矿物质—Au具有多源性;As、Sb、Ag、Au、Cu、Pb、Zn、Co、Ni为找矿指示元素;Hg是远程指示元素,而Au则是直接指示元素。指示元素的轴向分带序列为:As—Ag—Sb—Cu—Zn—Au—Pb—Ni—Co,并以此建立了预测矿体埋藏深度关系式:H=38.790As/Co+442.842 LnH=0.0923Ln[(As.Ag.Sb)/(Au.Co.Ni)]+6.3116 相似文献
10.
石英与金矿床关系十分密切,石英中含有众多的信息.通过对它的研究,可提取出许多找金矿的信息或标志.石英热发光曲线反映金的矿化强度,矿体中的石英热发光曲线呈双蜂或多峰;而矿化带中则呈包含多种隐伏峰的单蜂曲线.与成矿有关的石英红外吸光度D_2、D_2/D_1可定性地评价其含金性.含金石英中的Al_2O_3、K_2O、Na_2O、H_3O~(+)的含量随着矿体埋藏深度的增大而增加,可用其判别矿体的埋藏深度. 相似文献