Abstract
Melanocratic clinopyroxene-rich dikes intruding ultramafic cumulate rocks at the base of the Guanajuato magmatic sequence, in central Mexico, are classified as ankaramites.
They are high Mg, Cr and Ni basic rocks that have slightly enriched LREE-patterns, and Epsilon Nd (T=110 Ma) = +7.22 , which is consistent with their derivation from a high-field strength elements (HFSE) depleted source, within an island-arc setting. These magnesian rocks may have been parental to the mature tholeiitic and calc-alkaline series of this segment of the Guerrero terrane.
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