Environmental Effects on the Emplacement of 1.32 Ga Mafic Sills
In order to explore the relationship between deep earth dynamics and global carbon cycling processes,environmental changes,and planetary evolution during the Mesoproterozoic era,the Huangtugui Section in Beijing was selected as a stratigraphic section for studying the characteristics and environmental effects on the emplacement of 1.32 Ga mafic sills in Yanliao area.Through petrological and numerical simulation analysis,it was found that the 1.32 Ga mafic sills intruded into the surrounding rocks with the form of"magma finger",resulting in significant thermal effects on the surrounding rocks.The emplacement of the sills significantly increased the vitrinite reflectance of organic matter in the surrounding rocks,evolving from an immature stage to an overmature stage.The thermal degassing of the sills in North China Craton and North Australia Craton released an equivalent of 3.61×1012 tons of CO2,promoting the activation of carbon in the lithosphere and having obvious environmental effects.
万方数据
维普
