There are many melt and fluid inclusions(mainly CO_2-rich)in olivine and pyroxene phenocrysts inbasalts from the Ross Island area.The melt inclusions can be classified as follows:(1)crystalline meltinclusions(type Ⅰ),(2)fluid-melt inclusions(type Ⅱ)and(3)glass inclusions (type Ⅲ).The daughter mineralsin type I inchide olivine,plagioclase,ilmenite,etc.Fluid-melt inclusions are a new type which represent theimmiscibility of magma and fluid at a particular stage of evolution.Three types of fluid-melt inclusions wereexamined in this study:a)crystal+liquid+gas,b)inclusions coexisting with glass inclusions and fluidinclusions,and c)crystal+daughter mineral(dissolved salt)+gas.Both primary and secondary meltinclusions are recognizable in the samples.The secondary melt inclusions were formed during healing offractures in the host minerals in the process of magma rise.The homogenization temperatures(both Leitz 1350 stage and quench method were used)of meltinclusions in hasalts range from 1190 to 1350℃ at high pressure(about 7 kbars),indicating that the basaltsmay have come from the upper mantle.Melt-fluid immiscibility in basaltic magma shows that the CO_2-riehfluids may be the main fluid phase in the upper mantle,which are of significance in understanding theevolution of magma and various processes in the deep levels of the earth.The homogenization temperatures of melt and aqueous fluid inclusions in granites and metamorphicrocks in this area vary from 980 to 1100℃ and 279 to 350℃,respectively. There are many melt and fluid inclusions (mainly CO 2-rich) in olivine and pyroxene phenocrysts in basalts from the Ross Island area. Melt inclusions can be classified as follows: (1) crystalline meltinclusions (type Ⅰ), (2) fluid-melt inclusions (type Ⅱ) and (3) glass inclusions (type Ⅲ). The daughter mineralsin type I inchide olivine, plagioclase, ilmenite, etc. Fluid-melt inclusions are a new type which represent the mismiscibility of magma and fluid at a particular stage of evolution.Three types of fluid-melt inclusions wereexamined in this study: a) crystal + liquid + gas, b) inclusions coexisting with glass inclusions and fluidinclusions, and c) crystal + daughter mineral (dissolved salt) + gas.Both primary and secondary meltinclusions are recognizable in the samples. the secondary melt inclusions were formed during healing offractures in the host minerals in the process of magma rise. homogenization temperatures (both Leitz 1350 stage and quench method were used) of meltinclusions in hasalts range from 1190 to 1350 ° C at high pressure (about 7 kbars), indicating that the basaltsmay have come from the upper mantle. Melt-fluid immiscibility in basaltic magma that the CO_2-riehfluids may be the main fluid phase in the upper mantle, which are of significance in understanding the evolution of magma and various processes in the deep levels of the earth. homogenization temperatures of melt and aqueous fluid inclusions in granites and metamorphicrocks in this area vary from 980 to 1100 ° C and 279 to 350 ° C, respectively.