【摘要】 根据形态和产状 ,显微测温和拉曼探针分析资料 ,本区孔兹岩系岩石中流体包裹体可分三类 :1)碳质液相负晶形包体。产于变质峰期夕线石等之中 ,H2 O很低 (XH2 O≈ 0～ 17) ,碳质很高 (XCO2 + CH4≈ 70～ 90 ) ,密度为 1.0 0～ 1.0 5 g/cm3,相应压力约为 0 .7GPa。它们是含 H2 O比现在稍高且均匀的峰期流体相被封闭之后 ,在岩石进一步干化和减压过程中 H2 O从包体内不同程度向外泄漏后所成。 2 ) H2 O溶液两相包体 (XH2 O>80～ 85 )。主要集中于伟晶质脉体和花岗岩中 ,是这期岩浆冷凝过程析出的流体相当时就被封闭所成 ,密度为 0 .93～ 0 .96 g/cm3,相应压力约 0 .6 GPa,这与峰期后迅速减压过程结束时的条件相符。 3) CO2 - H2 O两相和多相包体 ,分布最广 ,成簇状和拖尾状包体群 ,碳质和 H2 O相对含量很不均匀 ,整体密度相对最低 ,一般为 0 .6～ 0 .8g/cm3,相应压力为 0 .3～ 0 .4GPa,它们可能是大幅度减压过程中第一类包体大量爆裂析出的碳质流体与第二类 H2 O溶液流体在各处以不同比例混溶所成 ,它们被封闭后在降温至 330℃以下时分裂成两相或三相包体更多还原

【Abstract】 According to morphology, occurrence, data of homogenization temperature and composition, various fluid inclusions from rocks of the khondalite series may be divided into three major groups. 1) The carbonic liquid inclusions with negative crystal form in sillimanite and quartz of peak metamorphism. They are the earliest ones and characterized by low X H 2O (0~17) and high carbonic material (X CO 2+CH 4≈70~90) with density 1.00~1.05g/cm3 corresponding to P≈0.7GPa. Such inclusions may originally contain slightly higher water content than the present one during their entrapment, but had experienced leakage of H 2O in subsequent stage under a further dry and decompression environment. 2) Aqueous two-phase inclusions with X H 2O>80~85 and very low CO 2+ CH 4. They are most abundant in quartz of pegmatitic leucosomes and granitic rocks, and represent the fluid appearing in their cooling stage. The D L(H 2O) of such fluid is 0.93~0.96g/cm3 corresponding to P≈0.6GPa which is compatible with condition when the rapid decompression in this region was ended. 3) CO 2-H 2O two or three phases inclusions. They are the most widespread, and more frequently in clusters and in intragranular tails in quartz. The relative content of CO 2+CH 4 and H 2O is considerably variable. They are also characterized with lower density (0.6~0.8g/cm3) and low pressure about 0.3~0.4GPa, and may be originated by mixture of carbonic liquid from breaking of most inclusions of peak stage and aqueous liquid of magmatic source. After entrapment, the further decrease of temperature to lower than 330℃ made such fluid separated to two or three phases.更多还原