AI Article Synopsis
- The D/H ratio of Earth's water can help determine its origin, but Earth's oceans may not reflect the primordial D/H due to water cycling.
- To find a more accurate D/H signature, researchers need a reservoir that is isolated from surface changes.
- Analysis of lavas from Baffin Island and Iceland suggests that the deep mantle has a low D/H ratio, indicating a component that preserves its ratio from the original solar nebula.
Article Abstract
The hydrogen-isotope [deuterium/hydrogen (D/H)] ratio of Earth can be used to constrain the origin of its water. However, the most accessible reservoir, Earth's oceans, may no longer represent the original (primordial) D/H ratio, owing to changes caused by water cycling between the surface and the interior. Thus, a reservoir completely isolated from surface processes is required to define Earth's original D/H signature. Here we present data for Baffin Island and Icelandic lavas, which suggest that the deep mantle has a low D/H ratio (δD more negative than -218 per mil). Such strongly negative values indicate the existence of a component within Earth's interior that inherited its D/H ratio directly from the protosolar nebula.
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| http://dx.doi.org/10.1126/science.aac4834 | DOI Listing |
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