Cenozoic evolution of Neotethys and implications for the causes of plate motions

Details Cenozoic evolution of Neotethys and implications for the causes of plate motions Cenozoic evolution of Neotethys and implications for the causes of plate motions

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30tsde6m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 20, pp. SDE 6-1, CiteID 2036, DOI 10.1029/2003GL017992

Physics

51

Tectonophysics: Continental Contractional Orogenic Belts, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Plate Motions-General, Tectonophysics: Plate Motions-Present And Recent (3040)

Scientific paper

Africa-North America-Eurasia plate circuit rotations, combined with Red Sea rotations and new estimates of crustal shortening in Iran define the Cenozoic history of the Neotethyan ocean between Arabia and Eurasia. The new constraints indicate that Arabia-Eurasia convergence has been fairly constant at 2 to 3 cm/yr since 56 Ma with slowing of Africa-Eurasia motion to <1 cm/yr near 25 Ma, coeval with the opening of the Red Sea. Ocean closure occurred no later than 10 Ma, and could have occurred prior to this time only if a large amount of continental lithosphere was subducted, suggesting that slowing of Africa significantly predated the Arabia-Eurasia collision. These kinematics imply that Africa's disconnection with the negative buoyancy of the downgoing slab of lithosphere beneath southern Eurasia slowed its motion. The slow, steady rate of northward subduction since 56 Ma contrasts with strongly variable rates of magma production in the Urumieh-Dokhtar arc, implying magma production rate in continental arcs is not linked to subduction rate.

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