A cold seep (sometimes called a cold vent) is an area of the ocean floor where hydrogen sulfide, methane and other hydrocarbon-rich fluid seepage occurs, often in the form of a brine pool. "Cold" does not mean temperature of seepage is lower than surrounding sea water. On the contrary, its temperature is often slightly higher. Cold seeps constitute a biome supporting several endemic species.
Cold seeps develop unique topography over time, where reactions between methane and seawater create carbonate rock formations and reefs. These reactions may also be dependent on bacterial activity. Ikaite, a hydrous calcium carbonate, can be associated with oxidizing methane at cold seeps.
Read more about Cold Seep: Types, Formation and Ecological Succession, Distribution, In The Atlantic Ocean, In The Mediterranean, In The West Pacific, In The East Pacific, In The Antarctic, Detection, Fossilized Records
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