The Lost City Hydrothermal Field: An Ancient Deep-Sea Ecosystem

The Lost City Hydrothermal Field, located west of the Mid-Atlantic Ridge, is an underwater landscape of carbonate towers. Discovered in 2000 over 700 meters beneath the surface, it is recognized as the longest-lived venting environment known in the ocean.

Recognized as the longest-lived venting environment known in the ocean, the Lost City Hydrothermal Field offers a unique glimpse into deep-sea ecosystems.

An Enduring Ecosystem

For at least 120,000 years, the upthrusting mantle in this region has reacted with seawater, releasing hydrogen, methane, and other dissolved gases. These hydrocarbons support unique microbial communities within the vents' cracks, even without oxygen. The chimneys, which emit gases as hot as 40 °C, host an abundance of snails and crustaceans, with larger animals like crabs, shrimp, sea urchins, and eels also present.

Unlocking the Secrets of Life's Origins

In 2024, a 1,268-meter core sample was recovered from the Lost City. Researchers anticipate this core will provide crucial evidence regarding the emergence of life on Earth billions of years ago. The hydrocarbons produced by these vents are formed through deep-seafloor chemical reactions, rather than from atmospheric carbon dioxide or sunlight. This characteristic suggests the possibility that life originated in similar habitats, not only on Earth but potentially on other celestial bodies such as Enceladus, Europa, or ancient Mars.

Researchers anticipate the 2024 core sample will provide crucial evidence regarding the emergence of life on Earth billions of years ago.

Distinctive Geology and Chemistry

Unlike underwater volcanic vents known as black smokers, the Lost City's ecosystem does not rely on magma heat. Black smokers primarily produce iron- and sulfur-rich minerals, whereas the Lost City's chimneys generate significantly more hydrogen and methane. The calcite vents of The Lost City are also considerably larger, indicating a longer period of activity.

Threats and Conservation Efforts

Despite its scientific significance, deep-sea mining poses a potential threat. In 2018, Poland secured rights to mine in the deep-sea area surrounding The Lost City. Scientists express concern that mining-related plumes or discharges could negatively impact the habitat. Consequently, some experts advocate for The Lost City to be designated a World Heritage site to ensure its protection.

Scientists express concern that mining-related plumes or discharges from deep-sea mining could negatively impact the Lost City habitat.