Is there a Grenvillian basement in the Guerrero-Morelos Platform of Mexico?

G. P. R. LEVRESSE, J. TRITLLA I CAMBRA, E. DELOULE, P. J. PINTO LINARES

Abstract


In the Guerrero-Morelos platform (Guerrero State, Mexico) the adakitic rocks of Early Tertiary age contain abundant hornblende-rich tonalite xenoliths. Zircon crystals have been concentrated from both adakites and xenoliths, and dated using in-situ U-Pb ion microprobe analyses. These analyses indicate the presence of inherited Grenvillian and early Triassic/late Permian crust ages, as well as a Paleocene age related with the adakite rock intrusion. This range of inherited ages is reported for the first time in the Guerrero-Morelos platform, suggesting that a continous Grenvillian crust exists between the Oaxacan complex,to the East, and the Guerrero-Morelos platform.

Keywords


U-Pb dating. Zircon. Guerrero. Grenvillian Age.

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DOI: http://dx.doi.org/10.1344/105.000000302

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Geologica Acta (ISSN-1695-6133)
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