Abstract
New tectonomagmatic discriminant diagrams are proposed to determine the geodynamic settings of basalt formation from geochemical data. The reference (training) sets, on which the diagrams are based, comprise (1) recent island-arc basalts (IAB, n = 2902); (2) within-plate basalts (WPB, n = 12379); (3) mid-ocean ridge basalts (MORB, n = 1828); and (4) postcollision basic rocks, including dikes and sills (PCB, n = 1823). To determine the geodynamic settings of basalt formation, the belonging of a tested object to one of WPB + PCB, MORB, or IAB + PCB groups is first established, and then PCB is discriminated from WPB or IAB. The average weighted uncertainty of IAB, MORB, and WPB identification is about 10%. The use of new diagrams results in a substantial decrease in classification errors as compared with previously elaborated plots.
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Original Russian Text © S.D. Velikoslavinsky, D.P. Krylov, 2014, published in Geotektonika, 2014, Vol. 48, No. 6, pp. 77–91.
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Velikoslavinsky, S.D., Krylov, D.P. Geochemical discrimination of basalts formed in major geodynamic settings. Geotecton. 48, 427–439 (2014). https://doi.org/10.1134/S0016852114060077
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DOI: https://doi.org/10.1134/S0016852114060077