Ice-VII inclusions in diamonds: Evidence for aqueous fluid in Earth's deep mantle.
basic_science · Level V
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- Record sourced from PubMed, PMID 29590042.
- Also identified by DOI 10.1126/science.aao3030.
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Abstract
Water-rich regions in Earth's deeper mantle are suspected to play a key role in the global water budget and the mobility of heat-generating elements. We show that ice-VII occurs as inclusions in natural diamond and serves as an indicator for such water-rich regions. Ice-VII, the residue of aqueous fluid present during growth of diamond, crystallizes upon ascent of the host diamonds but remains at pressures as high as 24 gigapascals; it is now recognized as a mineral by the International Mineralogical Association. In particular, ice-VII in diamonds points toward fluid-rich locations in the upper transition zone and around the 660-kilometer boundary.