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Calculation of the co2 degassing during contact Metamorphism and Its Geological Significance:The Model and Example from the Shuanshan Area of the South Tan-Lu Fault Belt

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Acta Geologica Sinica(English Edition) 2008年第3期82卷 562-576页

作者： YANG Xiaoyong LIU Deliang CHEN Yongjian DAI Jinxing CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China State Key Laboratory of continental Dynamics Department of Geology Northwest University Xi＇an 710069 China The Institute of Research and Exploration for Oil and Natural Gas China ChiefOil and Natural Gas Corporation Beijing 100083 China

The paper studies co2 degassing and controlling factors under the condition of contact metamorphism in the Shuangshan area, southern Tan-Lu fault belt and the method of calculating the amount of co2 degassing. The results show that the amount of co2 degassing is controlled by the characteristics of the country rocks, including the thermal conductivity, penetrability, porosity and connectivity. compositions, size and depth of intrusive rock also have an important influence on co2 degassing, i.e., they generated numerous cracks in the country rocks, and thus allowed the easy flow and accumulation of fluids. The amount of co2 flux in contact metamorphism is calculated quantitatively based on the metamorphic reaction and time-integrated fluid flux. The value （0.729- 2.446×10^4 mol/cm^2） of co2 flux suggests that co2 was provided mainly by the contact metamorphic reaction. The generation and releasing of co2 are positively correlated with the degree of metamorphism, and Xco2 in fluids gradually increases from dolomite zone to calcite zone, but in the zone of grossular, fluid flux is the largest and Xco2 sharply decreases due to involvement of magmatic water. This study presents evidence that a large amount of industrial-scale co2 can be produced during contact metamorphism. On the basis of theoretical and practical studies, a cone model has been proposed to response co2 degassing for the contact metamorphism, and it can be used to explore co2 accumulations beyond the oil-gas basins. This model can also be applied to the study of inorganic genesis of co2 accumulations.

关键词： contact metamorphism co2 degassing co2 accumulations Tan-Lu fault belt

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