An arc ankaramite occurrence in central Mexico

Luis Enrique Ortiz-Hernández Consejo de Recursos Minerales, Gerencia de Investigación Aplicada. Blv. Felipe Angeles s/n km 93.5 Col. Venta Prieta, C.P. 42080 Pachuca, Hgo. Instituto Politécnico Nacional, Sección de Estudios de Posgrado e Investigación, ESIA-Unidad Ticomán. Av. Ticomán No. 600 Col. San José Ticomán. Del. Gustavo A. Madero, C.P. 07340 México, D.F.

Keywords: Ankaramite, dikes, arc magmatism, Guanajuato, central Mexico

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.

Published

2018-11-13

Issue

Vol 17 No 1 (2000)

Section

Regular Papers

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