摘要
对丹巴地区动热变质岩石英中的流体包裹体研究表明，第一类型包裹体为高密度CO2包裹体，与深层滑脱作用密切相关，其温度、压力可代表变质峰期的温压条件。第二类型包裹体为CO2－H2O包裹体，H2O含量增加，与变质峰期后的抬升作用有关。第三类型包裹体为NaCl－H2O包裹体，以H2O为主，与抬升作用引起的退变质作用有关。其形成温度依次降低，说明它们是在变质作用的不同阶段捕获的。
Fluid inclusions in quartz from the dynamothermal metamorphic rocks in the Danba areawere analysed by ndcrothermometry. Three types of fluid inclusions are distinguished. Type Icontaips high-density CO2 phase. The trapping temperature and pressure represent the p-t condi-tions of peak metamorphism; TypeⅡ is CO2-H2O inclusions and contains more H2O. It is relatedto uplifting and Type, Ⅱis NaCl-H2O inclusions rich in H2O. It is responsible for retrograde meta-morphism caused by uplifting. The trapping temperature shows a decreasing trend. It is suggestedthat the fluid inclusions were trapped at different stages of metamorphism.
出处
《矿物学报》
CAS
CSCD
北大核心
1997年第2期135-141,共7页
Acta Mineralogica Sinica
