Earth's Deep Water Cycle

Earth's Deep Water Cycle

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Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 168. The distribution of H2O in the Earth is under debate. Although liquid water covers 70% of the surface, the oceans represent only about 0.025% of the planet's mass-far less water than thought to have been present during Earth's formation. If our planet is qmissingq most of its original water, could it reside in the mantle? Can we detect it seismically? Recognition of the capacity of some deep-mantle minerals to absorb water has propelled an interdisciplinary field of research addressing these two questions, and more. Earth's Deep Water Cycle advances the field with experimental, modeling, and seismic studies that focus on the physical characteristics of qhydratedq minerals, the potentially H2O-rich transition zone (410-660 km depth), and our detection abilities. Integrated perspectives from four fields of research are featured: Mineral physics and geochemistry Seismology and electrical conductivity Properties of deep hydrous mantle Global models and consequences of a deep-Earth water cycle From experimental synthesis and physical properties measurements to geophysical observations and geodynamic modeling, we are beginning to understand what parameters and data are needed to detect or refute the possibility of water in the deep Earth.The bulk composition of the phase relations in Figure 3 is shown by the star. ... into two pressure ranges: below 10 GPa for a serpentine mineral (antigorite) and above 10 GPa for high-pressure hydrous phases which ... et al., 2005a], phase relations of high- P hydrous phases have previously been studied by high- pressure experiments only. ... the MSH system over the past 40 years, no study has made a comprehensive phase diagram for hydrous peridotite to deep mantle conditions.

Title:Earth's Deep Water Cycle
Author:Steven D. Jacobsen, Suzan van der Lee
Publisher:American Geophysical Union - 2006-01-10


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