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Journal Article

Seismically invisible water in Earth's transition zone?

Authors

Schulze,  Kirsten
External Organizations;

Marquardt,  Hauke
External Organizations;

Kawazoe,  Takaaki
External Organizations;

Boffa Ballaran,  Tiziana
External Organizations;

McCammon,  Catherine
External Organizations;

/persons/resource/mkoch

Koch-Müller,  M.
4.3 Chemistry and Physics of Earth Materials, 4.0 Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Kurnosov,  Alexander
External Organizations;

Marquardt,  Katharina
External Organizations;

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Fulltext (public)

3321888.pdf
(Postprint), 755KB

Supplementary Material (public)
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Citation

Schulze, K., Marquardt, H., Kawazoe, T., Boffa Ballaran, T., McCammon, C., Koch-Müller, M., Kurnosov, A., Marquardt, K. (2018): Seismically invisible water in Earth's transition zone? - Earth and Planetary Science Letters, 498, 9-16.
https://doi.org/10.1016/j.epsl.2018.06.021


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3321888
Abstract
Ringwoodite, the dominant mineral at depths between 520 km and 660 km, can store up to 2–3 wt.% of water in its crystal structure, making the Earth's transition zone a plausible water reservoir that plays a central role in Earth's deep water cycle. Experiments show that hydration of ringwoodite significantly reduces elastic wave velocities at room pressure, but the effect of pressure remains poorly constrained. Here, a novel experimental setup enables a direct quantification of the effect of hydration on ringwoodite single-crystal elasticity and density at pressures of the Earth's transition zone and high temperatures. Our data show that the hydration-induced reduction of seismic velocities almost vanishes at conditions of the transition zone. Seismic data thus agree with a wide range of water contents in the transition zone.