Relationship between organic matter enrichment degree of black shale and paleoclimate:Taking the shale of the Wufeng-Longmaxi Formation in the Middle and Upper Yangtze region as an example
There is relatively little research on the relationship between the enrichment degree of organic matter in black shale and paleoclimate,and it is generally believed that the warmer and wetter the paleoclimate,the higher the primary productivity,and the more conducive it is to the enrichment of organic matter.However,this understanding is contradictory to the carbon sequestration law in modern environmental science.Therefore,it is necessary to fully integrate modern environmental science and ecology,analyze the characteristics of organic carbon burial in modern and ancient times,and deeply explore the impact of climate on carbon sequestration.The method is to analyze the carbon sequestration situation in modern soils,wetlands and oceans at both global and local scales,and grasp the relationship between carbon sequestration efficiency and climate.The conclusion is that regions with high carbon sequestration efficiency are mainly in the cold temperate zone,corresponding to regions with lower primary productivity.However,regions with high primary productivity in temperate and tropical regions at mid to low latitudes exhibit lower carbon sequestration efficiency.The control of temperature on the enrichment degree of organic matter in black shale is much greater than that of redox conditions.The black shale of the Wufeng-Longmaxi Formation in the Middle and Upper Yangtze region developed during the third Great Ice Age on earth,corresponding to a cold and humid climate zone.It is a low salinity lagoon environment under the background of regression,corresponding to low primary productivity.The latitudinal shift of the cold temperate zomes triggered by paleoclimate changes controls the distribution of shale oil,gas and coal.
Black shaleCarbon sequestrationCold temperate zoneSedimentary environmentPrimary productivity
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