The influence of a stratified rheology on the flexural response of the lithosphere to (un)loading by extensional faulting

Details The influence of a stratified rheology on the flexural response of the lithosphere to (un)loading by extensional faulting The influence of a stratified rheology on the flexural response of the lithosphere to (un)loading by extensional faulting

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.134..721t&link_type=abstract

Geophysical Journal International, Volume 134, Issue 3, pp. 721-735.

Astronomy and Astrophysics

Astronomy

24

Basins, Extension, Flexure Of The Lithosphere, Rheology, Viscosity

Scientific paper

We present a two-layered finite difference model for the flexural response of the lithosphere to extensional faulting. The model allows for three modes of flexure: (1) fully coupled, with the upper crust and mantle welded together by the lower crust; (2) fully decoupled, with the upper crust and mantle behaving as independent layers; and (3) partly decoupled, signifying that the response of the upper crust to small-wavelength loads is superimposed on the response of the entire lithosphere to long-wavelength loads. Which of these modes of flexure is to be expected depends on the rheology and especially the thermal state of the lithosphere. Coupled behaviour is related to a cold and strong lithosphere. The Baikal Rift Zone provides a typical example for this mode of flexure. A fully decoupled lithosphere is an exceptional case, related to anomalous high temperatures in the lower crust, and is observed in the Basin and Range province. The most common case is a partly decoupled lithosphere, with the degree of decoupling depending on the thickness and viscosity of the lower crust. This is inferred, for example, for the Bay of Biscay margin.

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