Istituto di Geoscienze e Georisorse     
Corti G. Dynamics of periodic instabilities during stretching of the continental lithosphere: View from centrifuge models and comparison with natural examples. In: Tectonics, vol. 24 (TC2008) pp. 0 - 19. American Geophysical Union, 2005.
Analogue models are used to investigate the development of periodic instabilities during a wide rifting mode of continental extension. The results of modeling support that unstable lithospheric extension is accompanied by development of regularly spaced structures at two characteristics wavelengths: a crustal (shorter) wavelength and mantle (longer) wavelength. Both wavelengths are dependent on the brittle/ductile decoupling (i.e., dominance of the brittle rheology of the upper crust over the ductile behavior), as an increase in the brittle layer thickness and a decrease in the extension velocity (decreasing the ductile resistance) lead to an increase in both crustal and mantle wavelengths. The characteristic wavelengths also increase with increasing the amount of total extension, whereas variations in the thickness of the ductile lower crust have minor effects on the spacing of structures. These results are similar to previous analytical models and match well the wavelength of structures in regions undergoing wide rifting, as the Basin and Range, the Aegean, the West Antarctic Rift System and examples from the extensional systems of the China-Mongolia regions.
URL: http://https://sites.agu.org/
Subject continental lithosphere
wide rifting
streching instabilities
centrifuge models
experimental results

Icona documento 1) Download Document PDF

Icona documento Open access Icona documento Restricted Icona documento Private


Per ulteriori informazioni, contattare: Librarian http://puma.isti.cnr.it

Valid HTML 4.0 Transitional