Geochemical discrimination of basalts formed in major geodynamic settings

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...

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Bibliographic Details
Published in:Geotectonics 2014-11, Vol.48 (6), p.427-439
Main Authors: Velikoslavinsky, S. D., Krylov, D. P.
Format: Article
Language:English
Subjects:
Basalt
Diagrams
Dikes
Earth and Environmental Science
Earth Sciences
Geochemistry
Island arcs
Marine
PCB
Plate tectonics
Polychlorinated biphenyls
Structural Geology
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Summary: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.
ISSN:0016-8521
1556-1976
DOI:10.1134/S0016852114060077