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为了定量分析碳酸盐岩接触变质作用形成的CO2,研究了松辽盆地东北缘碳酸盐岩接触变质带常量元素和稀土元素的元素分配关系。认为碳酸盐岩接触变质过程中主要体现为硅的富集和钙、碳的亏损,并且CaO、SiO2与ΣREE呈线性关系;随着变质程度增高,元素的含量、稀土元素的分布型式和分馏程度越趋向花岗岩,其主要原因是碳酸盐岩与侵入流体的混染作用、碳酸盐岩硅化及矿化过程引起的稀土变化、碳酸盐岩重结晶对轻稀土元素的富集。计算得出了CO2释放量与岩石体积比(2.7～256.7)。证明了碳酸盐岩接触变质作用是无机成因CO2形成的机制。
In order to quantitatively analyze the CO2 formed by the contact metamorphism of carbonate rocks, the elemental distributions of the major elements and rare earth elements in the carbonatite contact metamorphic belt in northeastern Songliao Basin were studied. It is considered that the enrichment of silicon and loss of calcium and carbon in the process of contact metamorphism of carbonate rocks are mainly reflected by the fact that CaO and SiO2 have a linear relationship with ΣREE. With the increase of metamorphism, the content of elements, the distribution pattern of rare earth elements and fractionation The more the degree is to the granites, the main reason is the mixing of carbonate and intrusive fluids, the change of rare earths due to the silicification and mineralization of carbonate rocks, and the enrichment of light rare earth elements by carbonate recrystallization. Calculated the CO2 release and rock volume ratio (2.7 ~ 256.7). It is proved that the contact metamorphism of carbonate rocks is a mechanism of inorganic formation of CO2.