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GSA Bulletin; May 2006; v. 118; no. 5-6; p. 764-765; DOI: 10.1130/B25799.1
© 2006 Geological Society of America
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Geologic evolution of the Xolapa Complex, southern Mexico: Evidence from U-Pb zircon geochronology: Discussion

L.A. Solari{dagger},1 and P. Schaaf2

1 Instituto de Geología, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Del. Coyoacán, 04510, Mexico City, México
2 Instituto de Geofísica, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Del. Coyoacán, 04510, Mexico City, México

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   INTRODUCTION
 
The geological evolution of the Xolapa Complex, recently described by Ducea et al. (2004), is important in the tectonic history of southern Mexico. However, incorrectly located samples, inadequate mapping and structural interpretations, and imprecise dates undermine the conclusions they presented.


   MAPPING ERRORS
 
Puerto Angel Transect
Ducea et al. (2004, p. 1017) state "All rocks studied here are part of the Xolapa terrane." However, all of the samples in the Puerto Angel transect are plotted within the Oaxacan Complex according to their Table 1 (Fig. 1). Thus, they actually dated samples belonging to Grenvillian basement rocks rather than the Xolapa terrane.


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  		Figure 1. Simplified geologic map of southern Mexico, modified after Ortega-Gutiérrez et al. (1999) and Elías-Herrera and Ortega-Gutiérrez (2002). The triangular, shaded area north of Puerto Escondido corresponds to the Juchatengo terrane of Grajales-Nishimura et al. (1999). Tierra Colorada–El Ocotito and Xaltianguis granodiorites are reported as reference and redrawn from Consejo de Recursos Minerales (1998) geologic map.

 
Puerto Escondido Transect
The contact between the Oaxacan and Acatlán Complexes, in Figure 1C of Ducea et al. (2004), is mapped incorrectly (see Ortega-Gutiérrez et al., 1999; Elias-Herrera and Ortega-Gutiérrez, 2002). When correctly located (Fig. 1), it . . . [Full Text of this Article]




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Home page
 Geological Society of America BulletinHome page
M. N. Ducea, G. E. Gehrels, S. Shoemaker, J. Ruiz, and V. A. Valencia
Geologic evolution of the Xolapa Complex, southern Mexico: Evidence from U-Pb zircon geochronology: Reply
Geological Society of America Bulletin, May 1, 2006; 118(5-6): 766 - 767.
[Full Text] [PDF]


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