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Talc's Hidden Role: Water Transport Deep Underground

11/15/2025

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Summary

Story summary

A study finds talc in the oceanic crust can transport water deep underground by forming a superhydrated crystal that stores about 31% water by weight at depths of 56–78 miles in cold subduction zones.
The researchers say talc's water absorption under specific conditions could affect magma supply and earthquake patterns.
The study, published in Nature Communications, calls for reevaluating subduction-related geochemistry and the role of water in Earth's deep interior.

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Story summary

A study finds talc in the oceanic crust can transport water deep underground by forming a superhydrated crystal that stores about 31% water by weight at depths of 56–78 miles in cold subduction zones.
The researchers say talc's water absorption under specific conditions could affect magma supply and earthquake patterns.
The study, published in Nature Communications, calls for reevaluating subduction-related geochemistry and the role of water in Earth's deep interior.