Unknown
AGU (American Geophysical Union)
In:
In: Earth's Deep Water Cycle. , ed. by Jacobsen, S. D. and Lee, S. F. M. v. d. Geophysical Monograph Series, 168 . AGU (American Geophysical Union), Washington, DC, pp. 163-276. ISBN 978-0-87590-433-7
Publication Date:
2017-05-16
Description:
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.
Type:
Book chapter
,
PeerReviewed
Format:
text
Format:
text
Format:
text
Format:
text
Format:
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