A rheological weak zone intensified by post-rift thermal relaxation as a possible origin of simple shear deformation associated with reactivation of rifting

Details A rheological weak zone intensified by post-rift thermal relaxation as a possible origin of simple shear deformation associated with reactivation of rifting A rheological weak zone intensified by post-rift thermal relaxation as a possible origin of simple shear deformation associated with reactivation of rifting

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.248..134y&link_type=abstract

Earth and Planetary Science Letters, Volume 248, Issue 1-2, p. 134-146.

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Rheological heterogeneity brought about by the grain-size refinement associated with the spinel/plagioclase lherzolite reaction is discussed in the context of post-rift thermal relaxation in continental rifts and passive margins. Above a critical temperature, the effect of grain-size refinement is not sufficient to obtain significant rheological heterogeneity. A critical time-scale for thermal relaxation, defined as a period when the temperature at the boundary of a reduced grain-size segment falls below the critical temperature, is evaluated in this study. It is found that a segmental rheological weak zone with a significant strength contrast can develop if the following conditions are satisfied: (1) a substantial grain-size reduction associated with spinel/plagioclase lherzolite reaction occurs during an earlier extensional event, and (2) a successive extensional event occurs after the critical time-scale for thermal relaxation (a few tens of million years). The development of such rheologically weak zones may contribute to simple shear deformation in rift-related sedimentary basins developed by multi-rifting events.

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