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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。长期以来研究包裹体子矿物主要采用光学显微镜测定光性、显微热台测定熔解温度等方法。但这些方法只适用于某些较大个体或熔解温度不太高的子矿物,而对多数子矿物来说是非常困难的。这是因为子矿物一般非常细小,其光性往往部分或全部为主矿物干扰,因而用光学显微镜只能观察到包裹体中各类细小的固相物质,而不能确定是什么矿物。如Nash和cunningham对科罗拉多詹姆斯萤石矿床超盐度包裹体进行了详细光学研究,可辨别出
Sub-minerals are fluid inclusions in mineral inclusions that precipitate as fine solids after temperature and pressure conditions change. Most solid materials with decreasing temperature, its solubility decreases. Therefore, not only the salt minerals such as NaCl and KCl crystallize out of the saturated solution at the time of temperature decrease, but also the ore-forming elements and silicate components remaining in the solution precipitate as fine minerals or vitreous bodies. For a long time the main study of inclusion minerals using optical microscopy to determine the optical properties of micro-hot bench to determine the melting temperature and other methods. However, these methods are only applicable to some larger individuals or sub-minerals that are not too high in melting temperature, which is very difficult for most sub-minerals. This is because the sub-minerals are generally very small and their light properties are mostly or partly disturbed by the main minerals. Therefore, only a small amount of solid matter in the inclusions can be observed with an optical microscope, and it is not possible to determine what kind of minerals. Nash and Cunningham conducted a detailed optical study of the ultra-salinity inclusions in the James Fluorite deposit in Colorado