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Development peculiarities of the magmatism synchronous to the formation of the North Atlantic passive margins

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Abstract

Magmatism synchronous to the formation of passive margins of the North Atlantic is discussed. The main features and causes of the geochemical enrichment of the primary magmas at the margins have been established. This paper is based on the published data on the Norwegian-Greenland tectonotype of volcanic margins and the West Iberia-Newfoundland tectonotype of nonvolcanic margins. In the first tectonotype the hot rifting and active magmatism gave rise to the formation of a thick crust at the margin and the adjacent oceanic zone. The second tectonotype is characterized by cold amagmatic rifting and slow initial spreading, which led to the widespread occurrence of ancient continental complexes and serpentinized mantle rocks at the margin, as well as the thin and disturbed oceanic crust nearby. In order to characterize the magmatism and initial oceanic opening, the geological and geochemical data pertaining to the reference sections chosen for each margin were compared in detail. In particular, the geochemical and isotopic data on the flood basalts and suites of parallel dikes related to the pre- and synbreakup magmatic phases were involved for the Norwegian-Greenland region. The predominance of tholeiites enriched in lithophile elements and radiogenic isotopes, as well as a significant contribution of continental material to them, are typical of the volcanic margins. No less than two enriched magma sources for the lower part of the volcanic complex are suggested, whereas a depleted or slightly enriched source is established for the upper part. A more enriched source as compared with the volcanic margins of the Norwegian-Greenland region is suggested for the low-volume magmatic manifestations at the nonvolcanic Iberian margin. The tectonic settings of margins development and their relationships with the effect of deep plumes and the propagation of the extension zone toward the cold Atlantic lithosphere are discussed.

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  1. Geological Institute, Russian Academy of Sciences, per. Pyzhevskii 7, Moscow, 119017, Russia

    E. N. Melankholina

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119995, Russia

    N. M. Sushchevskaya

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Original Russian Text © E.N. Melankholina, N.M. Sushchevskaya, 2013, published in Geotektonika, 2013, Vol. 47, No. 2, pp. 12–31.

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Melankholina, E.N., Sushchevskaya, N.M. Development peculiarities of the magmatism synchronous to the formation of the North Atlantic passive margins. Geotecton. 47, 75–92 (2013). https://doi.org/10.1134/S0016852113020040

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