A boundary zone in an ocean or aquatic environment where chemical conditions change dramatically, particularly where chemical energy from hydrothermal vents transitions to other conditions.
From 'chemo-' (chemical) + 'pause' (boundary, from Latin 'pausa' meaning stopping point). Analogous to 'thermocline,' describing a chemical boundary layer in water.
The chemopause is where the wildest chemistry happens on Earth—where super-hot, mineral-rich water meets cold ocean water, creating chemical reactions that support entire ecosystems without sunlight.
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