NDLI: Viscous mantle tangential stresses in a numerical model of a supercontinental cycle

Content Provider	Springer Nature Link
Author	Bobrov, A. M. Trubitsyn, A. P.
Copyright Year	2006
Abstract	The values of maximum tangential stresses, as well as their spatial orientations, are calculated at each point of the mantle. These calculations are performed for successive stages of the supercontinental cycle in terms of a numerical 2-D model of assembling and diverging continents driven by mantle flows; in turn, the flows themselves are formed under the thermal and mechanical action of continents. Zones of maximum tangential stresses, within which their values are equal to or exceed 30 MPa (300 bar), are shown to be located in places where ascending or descending mantle flows approach the horizontal mantle boundaries. These zones have the shape of a bowl with the broad side toward the boundary, and their maximum tangential stresses are oriented at an angle of about 45° to the horizontal. The dimensions of these zones amount approximately to 300 km laterally and 300 km in depth. Their subhorizontal and subvertical tangential stresses are close to zero. It is also shown that the stress values vary significantly during the evolution of the suboceanic mantle under a new opening ocean (after the breakup of a supercontinent). Thus, the maximum tangential stresses in this vast mantle region at the stage of fast ocean opening are, on average, more than two times higher than at the subsequent slow stage. Note that, at all stages, the axes of the maximum tangential stresses are oriented nearly horizontally or vertically almost throughout the aforementioned area.
Starting Page	629
Ending Page	638
Page Count	10
File Format	PDF
ISSN	10693513
Journal	Izvestiya, Physics of the Solid Earth
Volume Number	42
Issue Number	8
e-ISSN	15556506
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	General aspects Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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