礦物流體包裹體教學(xué)課件-文庫(kù)吧資料
2024-09-06 17:33本頁(yè)面
【正文】 S 包裹體的加溫均一現(xiàn)象 包裹體的加溫均一現(xiàn)象 2 Temperature Each cubic centimeter of white quartz or calcite may contain a billion fluid inclusions, each a selfcontained recording geothermometer, preserving for us the temperature of a specific moment in the pastthe moment of sealing of that particular inclusion, The fact that most of these billion inclusions may record the same temperature (or several temperatures representing the small number of geologic processes that the sample has experienced) does not detract from the wonder of it for me. （ 2）壓力 Pressure. Data obtained from fluid inclusions can provide information on the pressure of the environment at the time of trapping. A variety of procedures have been used for this purpose. All are based on experimental data on the thermodynamic properties of similar fluids, and many merely provide constraints on the minimum or maximum pressure of formation, but even this limited information can be valuable, The measured pressures range from near atmospheric to many kilobars. （ 3）密度 Density If the position and density of each of the phases now present in a fluid inclusion (., liquid, gas, or crystals) can be determined, along with their individual volumes, the total average density of the material in the inclusion can be calculated. Such densities are important in understanding the past circulation of fluids in the earth39。s Republic of China。 Ermakov and Dolgov, 1979, Thermobarogeochemistry, 271 pp。 such work was used very strong evidence to support the Neptunist theory of the formation of minerals and rocks from water. （ 2）研究歷史 2） 包裹體測(cè)溫理論的建立 In the following 155 years, a large number of invetigations of fluid inclusions was made, for a variety of reasons. Many invetigations were aimed at using or disproving the thesis proposed by Sorby (1858) that the gas bubbles present in the fluid of most inclusions are the result differential shrinkage of the liquid and the enclosing mineral during cooling from the higher temperature of trapping (Tt) to the temperature of observation[2]. （ 2）研究歷史 2） 包裹體測(cè)溫理論的建立 （ 續(xù) ） Sorby showed that the coefficients of expansion on heating (and, conversely, the coefficients of contraction on cooling) for a variety of liquid solutions resembling the fluids in inclusions were one or two orders of magnitude greater than the coefficients for the enclosing or host minerals. Hence, he reasoned that the temperature of trapping can be estimted by heating the sample to the point at which the bubbles disappear, ., the temperature of homogenization(Th). （ 2）研究歷史 —Sorby (1858)的測(cè)溫理論 T P L G S （ 2）研究歷史 3） 近代包裹體研究的發(fā)展 Inclusions were a subject of intense study and debate by many geologists during Sorby?s time (索爾比時(shí)代 ), and some of the conclusions from their study were so disturbing to certain schools of geologic thought that many efforts were made to discredit them. Phillips (1875） pointed out that there are large variations in the position and nature of different inclusions in the same sample and that Sorby had obviously oversimplified the problem. One of the most serious questions challenging the validity of fluidinclus
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