Long-Term Ocean Venting: Seafloor system has been active for ages

Analyses of mineral deposits in and around a unique set of hydrothermal vents beneath the Atlantic Ocean suggest that the site’s tallest towers of minerals have been growing for at least 30,000 years.

SHIMMERING WATERS. This mineral formation precipitated as warm, extremely alkaline fluids spewed from the ocean floor and hit cold, carbonate-rich seawater.