扫描电子显微镜在研究矿物包裹体子矿物中的应用

Application of Scanning Electron Microscope in the Study of Daughter Minerals in Fluid Inclusion

子矿物是矿物包裹体内的流体在温压条件改变后沉淀出的细小固体相。多数固体物质随着温度的下降,其溶解度减小。因此,在温度下降时,不仅NaCl、KCl等盐类矿物从饱和状态溶液中结晶出来,而且残留在溶液中的造矿元素及硅酸盐组分也以微细矿物或玻璃体沉淀出来。

In study of daughter minerals in fluid inclusion the scanning electron microscope(SEM)has the advantages of high magnification,good image of the morphology,great depth of focus and ease of sample preparation.In addi-tion,it is equiped with X-ray detector and photograph apparatus.In the first part of this paper the image-forming principle and the work way of SEM have been introduced in brief.In the second part the selection and preparation of samples and the experimental procedures of the SEM study have been described in particular.In the third part application of SEM in the sthdy of daughter minerals in fluid inclusion has been introduced.The authors have observed the daughter minerals in fluid inclusions from the Xihuashan tungsten deposit,South China and investigated sylvite,halite,wolframite,chlorite of them under SEM.Besides,the dautgher minerals of fluid inclusions were studied in SEM by Metzger and other authors from the Santa Rosa porphyry copper(Peru),the Zabargad gemstone deposit(Red Sea),the Jamestown fluorite deposit(Colorado),the Witwatersrand Au deposit(Azania)and the Cu deposits(Namibia).The above-mentioned results indicate that the study of daughter minerals in fluid inclusions by use of SEM has a bright prospect.