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Title:
Temporal variations in the convective style of planetary mantles
Authors:
Loddoch, A; Stein, C; Hansen, U
Author Full Names:
Loddoch, Alexander; Stein, Claudia; Hansen, Ulrich
Source:
EARTH AND PLANETARY SCIENCE LETTERS 251 (1-2): 79-89 NOV 15 2006
Language:
English
Document Type:
Article
Author Keywords:
mantle convection; convective regimes; episodic regime; stagnant lid;
transitional behaviour
Keywords Plus:
STAGNANT LID CONVECTION; EARLY PLATE-TECTONICS; THERMAL EVOLUTION;
DEPENDENT VISCOSITY; VARIABLE-VISCOSITY; MAGNETIC-FIELD; MARS; VENUS;
FLUID; HISTORY
Abstract:
Investigations of mantle convection with temperature- and
strain-rate-dependent viscosity have shown the existence of
fundamentally different convective styles: By varying e.g. the Rayleigh
number, the viscosity contrast or the strain-rate dependency of
viscosity, the planform of convection in the asymptotic stationary
state changes from the so-called stagnant lid regime to an episodic
behaviour and further to a state characterised by a permanently
mobilised surface. Our studies suggest that this transition may not
only be induced by a change of parameters but also occurs temporally
for fixed parameters. We have in fact observed convective systems in
the stagnant lid regime that show isolated events of surface
mobilisation occurring out of a thermally equilibrated state. We use a
3D numerical mantle convection model to investigate mantle convection
and surface dynamics as a coupled fluid dynamical system. Our studies
focus on the existence of a transitional regime in which t!
emporal variations between the stagnant lid and the episodic
regime occur. We were able to deduce a mobilisation criterion that
describes the stability of the stagnant surface, thus allowing for a
quantitative analysis of the transition to a (temporarily) mobilised
surface. This criterion is also suitable to predict the occurrence of
surface mobilisation events. (c) 2006 Elsevier B.V All rights reserved.
Reprint Address:
Loddoch, A, Inst Geophys, Corrensstr 24, D-48149 Munster, Germany.
Research Institution addresses:
Inst Geophys, D-48149 Munster, Germany
E-mail Address:
loddoch@earth.uni-muenster.de;
stein@earth.uni-muenster.de;
hansen@earth.uni-muenster.de
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Cited Reference Count:
25
Times Cited:
0
Publisher:
ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Subject Category:
Geochemistry & Geophysics
ISSN:
0012-821X
IDS Number:
109HJ