Ancient Diamond Reveals Goethite's Ability to Carry Water Deep into Earth's Mantle
Brazilian researchers have uncovered the first direct evidence that the mineral goethite, commonly found in soils, can survive the extreme conditions of Earth's deep interior. This discovery was made within a tiny, 3-millimeter diamond containing a microscopic impurity of goethite. Goethite is known to form from iron-rich minerals in the presence of water, incorporating water molecules into its structure. The study indicates that this mineral could potentially act as a carrier, transporting water from the surface down into the lower mantle. This finding challenges previous assumptions about the mineral's stability under such high pressures and temperatures. It suggests a previously unrecognized pathway for water to reach the planet's deep interior. The research provides new insights into the Earth's water cycle and the composition of its deep mantle.
This discovery highlights a novel mechanism for water transport into the Earth's lower mantle, potentially influencing mantle dynamics and geological processes. The resilience of goethite under extreme conditions suggests that our understanding of deep-Earth mineralogy and the global water cycle may need revision. Future research could explore the scale of this water transport and its implications for mantle convection and long-term geological evolution, particularly in the context of planetary habitability and the deep carbon cycle.
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