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Mapping absolute migration of global mid-ocean ridges since 80 Ma to Present

Earth, Planets and Space volume 59, pages 1061–1066 (2007)Cite this article

Abstract

We have computed and mapped the absolute migration of global mid-ocean ridges in the past 80 m.y. and found that ridges have migrated substantially during that period. Presently, the faster-migrating ridges are Pacific-Antarctic, Central Indian, Southeast Indian, Juan de Fuca, Pacific-Nazca, Antarctic-Nazca and Australia- Antarctic ridges which migrate between 3.3 and 5.5 cm/yr. The slower-migrating ridges are Mid-Atlantic and Southwest Indian ridges which migrate between 0.3 and 2.0 cm/yr. Comparing these results with mantle tomography and geochemistry suggests that slower-migrating ridges have deeper depth of origin than faster-migrating ridges, implying a correlation between migration velocity and depth of origin of ridges. The reconstructed Southwestern Indian ridge (near 44°E) between 60 Ma and Present, lies atop reconstructed Central Indian ridge between 80 and 50 Ma, and the present-day Antarctic-Nazca or (Chile) ridge lies atop the reconstructed East Pacific Rise at 70 Ma. Furthermore, the South Mid Atlantic Ridge and the East Pacific Rise near 10?S appear to have been stationary relative to the mantle for the last 80 m.y. These observations suggest that different portions of the mantle have undergone different recycling history, and may explain the origin of mantle heterogeneities.

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  1. Institute of Marine Sciences, University of Dar Es Salaam, PO Box 668, Zanzibar, Tanzania

    Desiderius C. P. Masalu

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Correspondence to Desiderius C. P. Masalu.

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Masalu, D.C.P. Mapping absolute migration of global mid-ocean ridges since 80 Ma to Present. Earth Planet Sp 59, 1061–1066 (2007). https://doi.org/10.1186/BF03352047

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