Scientists Find Evidence That Earth’s Core Is Still Leaking Hydrogen, Helium and Tungsten

Earth’s core may not be as chemically isolated from the rest of the planet as scientists once thought. Research published in Science Advances on October 9, 2026, suggests that hydrogen trapped deep inside Earth may have gradually escaped into the surrounding mantle over geological time. The findings, from researchers at the University of Science and Technology of China, help explain unusual hydrogen isotope signatures found in volcanic rocks and strengthen the case for long-term chemical exchange between Earth’s core and mantle.

The study does not mean that scientists have directly watched hydrogen, helium, and tungsten escape from the core. Instead, researchers combined new computer simulations of hydrogen isotope behavior with existing geochemical evidence involving helium and tungsten. Together, these clues suggest that materials preserved since Earth’s formation may still influence the planet’s interior today. The discovery could help scientists better understand how Earth evolved, how its deep interior works, and how ancient chemical signatures reach the surface.

Key Takeaways

• New evidence of hydrogen transfer: A 2026 study suggests that hydrogen from Earth’s core may be entering the mantle.
• Machine learning aided the research: Researchers used accelerated simulations to model hydrogen isotope behavior under extreme conditions.
• Volcanic rocks provide clues: Some lavas contain unusually low deuterium-to-hydrogen ratios that are difficult to explain through early mantle crystallization alone.
• Helium and tungsten add context: Their unusual isotope signatures in deep-origin volcanic rocks provide additional evidence consistent with core-mantle exchange.
• The mechanism remains uncertain: Scientists still need to determine exactly how these materials move across the core-mantle boundary.
• No immediate surface danger: The research concerns slow geological processes, not a sudden leak or a new threat to people.

What Did Scientists Discover?

Earth formed approximately 4.5 billion years ago. During its early history, much of the planet was extremely hot and partially or extensively molten. As the planet differentiated, dense iron-rich materials sank toward the center to form the core, while silicate materials formed the mantle and, eventually, the crust.

This process separated many elements according to their chemical properties. Some materials became concentrated in the metallic core, while others remained in the rocky layers above it. Scientists have long debated how completely these deep reservoirs remained separated and whether chemical exchange continued over billions of years.

The new research examines one particularly useful tracer: hydrogen.

Hydrogen can occur in different isotopic forms. Ordinary hydrogen contains one proton and no neutron, while deuterium, a heavier isotope, contains one proton and one neutron. Scientists can compare their relative abundance to investigate where hydrogen originated and how it moved through Earth’s interior.

The researchers found that crystallization of Earth’s early magma ocean would not, by itself, produce the extremely low deuterium-to-hydrogen ratios observed in certain ocean island basalts. Their findings support the possibility that hydrogen with a distinctive primordial signature moved from the core into the mantle.

The study, titled Hydrogen isotopes reveal water leakage from the core, was published in Science Advances.

How Machine Learning Helped Study Earth’s Interior

Scientists cannot directly sample Earth’s core. It lies thousands of kilometers below the surface, under pressures and temperatures far beyond those encountered in ordinary laboratories.

Researchers therefore rely on a combination of laboratory experiments, geochemical measurements, physics-based calculations, and computer simulations.

In the 2026 study, the team used machine-learning-accelerated path-integral simulations to examine hydrogen isotope fractionation under conditions associated with Earth’s early magma ocean. Path-integral methods help model quantum effects in atomic systems, which can be important for a lightweight element such as hydrogen.

The researchers examined how hydrogen isotopes would distribute themselves between molten silicate material and minerals that form as magma cools. They then incorporated those results into a model of early mantle crystallization.

Research component	Purpose
Hydrogen isotopes	Trace possible differences in the origins and movement of hydrogen
Machine-learning-accelerated simulations	Study atomic behavior under extreme pressure and temperature
Magma ocean model	Test whether early crystallization could explain modern isotope signatures
Volcanic rock evidence	Compare model predictions with chemical signatures measured at the surface

The model suggested that isotope fractionation during early crystallization was too weak to explain the unusually low deuterium levels found in some volcanic rocks.

That result makes later chemical exchange between the core and mantle a more plausible explanation, although it does not directly measure the present-day leakage rate.

Why Hydrogen, Helium and Tungsten Matter

The case for core-mantle exchange rests on several different chemical clues. Each element tells scientists something different about Earth’s history.

Hydrogen: A tracer of ancient material

Hydrogen is especially useful because its isotopic composition can preserve information about its origin. Some hydrogen in Earth’s deep interior may have been incorporated during the planet’s formation.

If hydrogen with a distinctive isotopic signature escapes from the core, it could alter the composition of surrounding mantle material. That altered material may eventually rise through the mantle and contribute to volcanic eruptions.

The new study strengthens this explanation by showing that early magma ocean crystallization alone cannot readily account for the observed hydrogen isotope patterns.

Helium: Evidence of primordial material

Helium provides another important clue. Helium-3 is a rare isotope associated with primordial material, while helium-4 is produced in part by radioactive decay.

Some volcanic rocks originating from deep mantle regions have unusually high helium-3-to-helium-4 ratios. These signatures suggest that the material feeding the eruptions contains ancient components that have not been fully mixed with the surrounding mantle.

Such helium signatures are consistent with long-lived deep reservoirs and possible exchange involving the core. However, helium isotope evidence is not, on its own, definitive proof of a particular transport mechanism.

Tungsten: A chemical record of planetary formation

Tungsten offers a different kind of evidence. During Earth’s early differentiation, much of this heavy element became concentrated in the metallic core. Certain tungsten isotope variations in mantle-derived rocks have been interpreted as evidence of interaction between deep reservoirs.

Researchers can use these variations to investigate whether material from Earth’s earliest history has been transferred between the core and mantle.

Taken together, hydrogen, helium, and tungsten provide complementary clues. The latest hydrogen study adds to an existing body of research rather than independently demonstrating that all three elements are escaping at a measured rate today.

What Volcanic Rocks Reveal About Earth’s Deep Interior

Some of the most useful evidence comes from ocean island basalts, a type of volcanic rock associated with mantle plumes. These plumes are rising columns of hot material that may originate deep within Earth’s mantle.

Examples of volcanic regions studied for unusual deep-mantle signatures include Iceland and Baffin Island in the Canadian Arctic.

When mantle material rises and melts, its chemical composition can be preserved in the resulting lava. Scientists can analyze these rocks for isotope ratios that reveal information about the sources of the material.

The challenge is determining whether a chemical signature represents a reservoir preserved since Earth’s formation or a signature altered later by exchange between deep layers.

The 2026 study addresses that question by testing whether early crystallization could create the hydrogen isotope patterns observed today. Because the model did not reproduce the most extreme signatures, the authors argue that ongoing core-mantle exchange is a more plausible explanation.

However, volcanic rocks are indirect evidence. They do not provide a direct sample of the core, and other processes must be carefully evaluated before the origins of any particular signature can be established.

How Could Material Move From the Core to the Mantle?

Earth’s core consists primarily of iron and nickel, while the mantle is made largely of silicate rock. The boundary between them, roughly 2,900 kilometers beneath the surface, separates two very different materials.

How chemical components cross that boundary remains an important scientific question.

Possible mechanisms involve diffusion, chemical reactions, and the transfer of certain elements into the surrounding mantle under extreme conditions. Once incorporated into mantle material, components could be carried upward by large-scale convection and rising plumes.

The study supports the idea that chemical exchange has occurred over geological time, but it does not settle the precise physical mechanism or establish how quickly it happens.

Further research will be needed to quantify the amount of hydrogen that can move across the boundary, determine the relevant chemical conditions, and establish how these processes affect the mantle’s composition.

Does This Discovery Affect Earth’s Surface?

The findings do not indicate that Earth’s core is opening, that material is suddenly escaping, or that a dangerous event is approaching.

The term “leaking” is a simplified way to describe the possible movement of chemical components from the metallic core into the rocky mantle. These processes occur on geological timescales and are inferred from isotope signatures and models.

The research is important because it changes how scientists interpret the history of Earth’s interior. If core-mantle exchange has continued over billions of years, the planet’s deep layers may be more chemically connected than a simple model of permanently isolated reservoirs would suggest.

That could influence future research into mantle plumes, volcanic rocks, planetary formation, and the distribution of elements inside Earth. It does not, however, establish a direct connection to earthquakes, volcanic disasters, or immediate environmental risks.

The Bigger Picture

Earth’s core holds clues to the planet’s earliest history, but accessing those clues requires indirect methods. Isotope measurements in volcanic rocks, combined with advanced simulations, allow researchers to test competing explanations for how deep reservoirs formed and changed.

The latest findings strengthen the case that Earth’s core and mantle have exchanged materials over long periods. They also demonstrate how machine-learning-assisted calculations can help scientists examine atomic behavior under conditions that are difficult to reproduce experimentally. The research is a significant addition to our understanding of the planet, though the precise amount of material transferred and the mechanisms involved remain open questions.

FAQs

1. Is Earth’s core really leaking hydrogen?

The study provides evidence consistent with hydrogen moving from the core into the mantle over geological time. The conclusion is based on simulations and isotope signatures rather than direct observation of hydrogen escaping from the core.

2. Why are helium and tungsten mentioned alongside hydrogen?

Unusual helium and tungsten isotope signatures in volcanic rocks have previously been interpreted as evidence of deep-reservoir exchange. They provide supporting geochemical context, but the new study specifically investigates hydrogen isotope behavior.

3. How did scientists investigate the process?

Researchers used machine-learning-accelerated path-integral simulations to model hydrogen isotope fractionation under early Earth conditions. They compared the model’s results with isotope signatures found in volcanic rocks.

4. Does the discovery mean Earth’s core is becoming unstable?

No. The research concerns possible chemical transfer between Earth’s core and mantle over geological timescales. It does not report a sudden structural change or an immediate threat.

5. What happens next in this research?

Scientists will need to investigate the mechanisms that transfer material across the core-mantle boundary, estimate the scale of the exchange, and determine how it affects deep mantle chemistry over time.

Looking Ahead

The new study gives researchers a stronger framework for interpreting unusual hydrogen isotope signatures in volcanic rocks. By ruling out early magma ocean crystallization as a sufficient explanation for the most extreme measurements, it strengthens the case that Earth’s interior has continued to evolve through chemical exchange since the planet formed.

The next challenge is to establish exactly how this exchange works and how much material moves between Earth’s deepest layers. Further simulations, laboratory experiments, and geochemical measurements could help answer those questions. For now, the findings offer a compelling glimpse into the planet’s hidden history and the processes that may still be shaping its interior.