Abstract
Fifteen multi-dimensional diagrams [1–3] for basic and ultrabasic rocks, based on log-ratio transformations, were used to decipher tectonic setting for two case studies of Borborema province, NE Brazil. The applications of these diagrams indicated the following results: (1) a mid–ocean ridge setting for ForquilhaEclogite Zone during the Mesoproterozoic; (2) a transitional island arc to mid–ocean ridge setting for Algodoes during the Paleoproterozoic. Our interpretations of main result for basic-ultrabasic magmas, along with the original authors’ findings, were generally consistent.
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