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Oceanic potassic magmas: An example of the Atlantic Ocean

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Abstract

Statistical study of volcanic rocks from oceanic islands and seamounts in the Atlantic Ocean based on approximately 6000 analyses (data from the authors’ databank) makes it possible to recognize rocks close to the parental melts (approximately 2000 analyses). This set is demonstrated to include a unique group of high-potassium (K2O/Na2O > 1) rocks, whose K2O/Na2O ratio is several times higher than in the mantle and calls for the explanation of the mechanism that increased the K2O concentration during the melting of the mantle and for the identification of an additional K2O source in the mantle and a process responsible for K and Na differentiation. A new model is proposed to account for the genesis of high-potassium melts-fluids, whose ascent brings about extensive mantle metasomatism. The genesis of high-potassium fluid is related to solid-state reactions at deep mantle levels.

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  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    L. N. Kogarko & A. M. Asavin

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  1. L. N. Kogarko
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Correspondence to L. N. Kogarko.

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Original Russian Text © L.N. Kogarko, A.M. Asavin, 2009, published in Geokhimiya, 2009, No. 9, pp. 899–909.

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Kogarko, L.N., Asavin, A.M. Oceanic potassic magmas: An example of the Atlantic Ocean. Geochem. Int. 47, 847–856 (2009). https://doi.org/10.1134/S0016702909090018

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