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Researchers have identified a geological mechanism capable of transporting microscopic life from the deep seabed to shallower areas, showing that seismic activity also influences hidden biological cycles in the ocean.
Microbes buried about 1 kilometer below the seabed can remain dormant for extreme periods. Even so, some of this microscopic life manages to return to shallower areas and find conditions to awaken.
The movement of tectonic plates appears as a central piece of this process. Instead of merely pushing sediments down, it also paves the way for fluids to carry these organisms back to the shallow ocean.
This dynamic changes the way we understand life in the deep seabed. What seemed trapped for ages can, at certain points, return to the surface and start multiplying again.
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Sediments at 1 kilometer hold life for ages
These microbes remain isolated in deep sediment layers, where temperature and pressure hinder biological activity. Even so, many manage to endure long periods of dormancy.
The duration can last for thousands or even millions of years. This extreme time helps explain why the return to shallower regions draws so much attention.
Subduction pushes some organisms toward the mantle
The process occurs in subduction zones, where one tectonic plate moves beneath another. In this encounter, sediment rich in microbes is scraped and accumulated against the upper plate.
A large portion of the organisms continues with the sinking plate and keeps descending toward the Earth’s interior. However, another part manages to escape this deep trajectory.
Faults and fractures push fluids upward
The friction between the plates and the sliding of faults move fluids within the sediment wedge formed in this region. These fluids traverse fractures and carry dormant microbes to shallower layers.
This way, the organisms reach areas where pressure and temperature are milder. This return increases the chance of reactivation and new reproduction in the marine environment.
Costa Rica links seismic energy to the presence of deep microbes
According to SSA, a seismological society that promotes an annual scientific meeting, the relationship between seismic activity and the presence of deep microbes has emerged strongly in the subduction zone of Costa Rica. The greater the seismic energy, the higher the abundance of these organisms in surface layers.
The effect does not only depend on large earthquakes. Slow slips, silent tremors, and aseismic creep can also generate enough stress to mobilize fluids underground.
Tectonic pump can move 10³⁰ cells over millions of years
The team’s models indicate that this type of tectonic pump can circulate more than 1 million gigatons of fluid over millions of years. In this movement, the potential transport could reach 10³⁰ microbial cells.
The so-called cold seeps on the ocean floor reinforce this interpretation. At these points, fluids from the subsurface are released more easily, allowing for better observation of the link between tectonics and microscopic life.
DNA repair sustains extreme dormancy
To endure such long periods of dormancy, these microbes have developed DNA repair mechanisms and enzymes capable of breaking down organic matter under severe conditions. This set helps maintain vital functions for much longer than normal.
Genomic studies also suggest that certain mutations act to preserve characteristics over geological timescales. This reinforces the idea that these organisms not only survive but also retain the ability to reproduce again.
The results amplify the significance of earthquakes in the functioning of the planet. In addition to reshaping the landscape and releasing energy, they can also pave the way for the circulation of life hidden beneath the sea.
When seismic activity pushes fluids and microbes upward, the ocean floor gains a new perspective. What seemed like mere destruction also stirs ancient biological cycles and affects the Pacific.
With information published in Olhar Digital.
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