Implications of subduction rehydration for earth's deep water cycle.

Rüpke, Lars, Morgan, Jason P. and Dixon, T. H. (2006) Implications of subduction rehydration for earth's deep water cycle. In: Earth's Deep Water Cycle. , ed. by Jacobsen, Steven D. and Lee, Suzan Frederike Maria van der. Geophysical Monograph Series, 168 . American Geophysical Union, Washington, DC, pp. 163-276. ISBN 978-0-87590-433-7 DOI 10.1029/168GM20.

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Supplementary data:

Abstract

The "standard model" for the genesis of the oceans is that they are exhalations
from Earth's deep interior continually rinsed through surface rocks by the global
hydrologic cycle. No general consensus exists, however, on the water distribution
within the deeper mantle of the Earth. Recently Dixon et a/. [2002] estimated
water concentrations for some of the major mantle components and concluded that
the most primitive (FOZO) are significantly wetter than the recycling associated
EM or HIMU mantle components and the even drier depleted mantle source that
melts to form MORB. These findings are in striking agreement with the results of
numerical modeling of the global water cycle that are presented here. We find that
the Dixon et a/. [2002] results are consistent with a global water cycle model in
which the oceans have formed by efficient outgassing of the mantle. Present-day
depleted mantle will contain a small volume fraction of more primitive wet mantle
in addition to drier recycling related enriched components. This scenario is consistent
with the observation that hotspots with a FOZO-component in their source will
make wetter basalts than hotspots whose mantle sources contain a larger fraction
of EM and HIMU components.

Document Type: Book chapter
Keywords: composition of the mantle, water cycles, geochemical modeling
Research affiliation: OceanRep > SFB 574 > C5
OceanRep > SFB 574
Refereed: Yes
DOI etc.: 10.1029/168GM20
ISSN: 0065-8448
Contribution Number:
ProjectNumber
SFB 574107
Date Deposited: 25 Jan 2010 10:56
Last Modified: 16 May 2017 11:45
URI: http://oceanrep.geomar.de/id/eprint/377

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