Transition from continental break-up to punctiform seafloor spreading: How fast, symmetric and magmatic

Details Transition from continental break-up to punctiform seafloor spreading: How fast, symmetric and magmatic Transition from continental break-up to punctiform seafloor spreading: How fast, symmetric and magmatic

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30l...6c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 12, pp. 6-1, CiteID 1604, DOI 10.1029/2003GL017374

Physics

12

Tectonophysics: Continental Tectonics-Extensional (0905), Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Plate Boundary-General (3040)

Scientific paper

We present a comparison between numerical and analogue models focusing on the role of inherited lithospheric structures in influencing the process of continental break-up. Our results highlight that the presence of pre-existing anisotropies localizes strain and favors continental break-up and formation of a new ocean. For a fixed strain rate, the pre-rift lithosphere configuration influences rift duration, melt production and width and symmetry of the continental margin pair. Model results show a mainly two-phase tectonic history from continental extension to oceanization. In the first phase extension affects contemporaneously the whole rift structure, while in the second phase asthenosphere upwelling occurs into punctiform regularly-spaced spots sequentially propagating in an extension-orthogonal direction.

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