inclusions in diamonds:
water-saturated regions in the
O., Huang S., Greenberg E., Ma C., Rossman G., Shen A.H.
Bechtel H., Chen B., Zhang D., Dera P., Mewville M., Lanzirotti A.,
of Geoscience, University of Nevada Las Vegas, Las Vegas, Nevada 89154,
Center of Advanced Radiation Sources, University of Chicago, Illinois
of Geological and Planetary Sciences, California Institute of
Pasadena, California 91125, USA.
Institute, China University of
Geosciences, Wuhan 430074, China
Light Source, Lawrence Berkeley
Laboratory, Berkeley, California 94720 USA.
of Ocean and Earth Science and Technology, University of Hawai'i at
Honolulu, HI 96822, USA.
Ontario Museum, 100 Queen’s Park, Toronto, ON M5S 2C6, Canada.
show that ice-VII
occurs as inclusions in natural diamond. As the residue of aqueous
present during growth of diamond, ice-VII crystallized upon obduction
host diamonds and remained at pressures around 10 to 23 GPa, much
higher than any
previously known inclusion in diamonds. Ice-VII (now approved as a
- IMA2017-029) appears to be common in diamonds and serves as a very
geobarometer. We report thirteen occurrences, nine of which correspond
encapsulation at or below 410 km depth, two at or below 660 km, and two
range 130-180 km. These
witness of water-saturated conditions near the 410 and 660 km
provide strong support for the presence of water-rich layers in these