Quantitative analysis of the risk of hydrogen sulfide release from gas hydrates

The role that H 2 S plays in the global sulfur cycle has been studied extensively recent years. This paper focuses on influence of released from gas hydrates and establishes a one-dimensional mathematical model to calculate amount dissociation present multiple layers Qiongdongnan Basin China. results show sulfate methane transition zone covers an area about 100 km contains 2.3 × 10 12 g pyrite, which requires 4.06 11 mol for its formation. is 5.4 ×10 mol, 1.3 times needed formation pyrite. Therefore, important source pyrite sulfate-methane Basin. According flux partial pressure O (P O2 ) atmosphere, critical value balance between P turns out be 0.13 kg −1 ∙bar . Furthermore, considering effect sea-level changes, three risk modes are identified categorize hydrate into atmosphere. We classify periods 5–12 Ma BP, 25–29 47–52 Ma, 57–61 BP high-risk mode. part oxidized by Fe (III) oxide metal, with much metal ions being pore water. Another re-oxidized ocean, SO 4 2- seawater. process also provides water or seawater when diffuses bottom. new insights ocean shows contained cycle.