Deformational history of the Granjeno Schist, Ciudad Victoria, Mexico

Constraints on the closure of the Rheic Ocean?

David S. Dowe, R. Damian Nance*, J. Duncan Keppie, K. L. Cameron, A. Ortega-Rivera, F. Ortega-Gutiérrez, J. W K Lee

*Corresponding author for this work

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    Exposed in the core of a NNW-trending frontal anticline of the Laramide fold-thrust belt of northeastern Mexico, the Granjeno Schist comprises a polydeformed assemblage of Paleozoic metasedimentary and metavolcaniclastic rocks and serpentinized mafic-ultramafic units. The earliest deformation (D1) predates emplacement of a leucogranite at 351 ± 54 Ma and may record obduction of this oceanic unit. Subsequent deformations (D2a-D2c) record tectonic juxtapositioning of the Granjeno Schist against the ∼1 Ga Novillo Gneiss by NNW-directed dextral shear under conditions of decreasing temperature. Cooling ages of 313 ± 13 Ma and 300 ± 4 Ma are considered to date the onset of dextral motion, which continued into the Permian. These events are linked to the Late Paleozoic closing of the Rheic Ocean.

    Original languageEnglish
    Pages (from-to)920-937
    Number of pages18
    JournalInternational Geology Review
    Volume47
    Issue number9
    Publication statusPublished - Sep 2005

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  • Cite this

    Dowe, D. S., Nance, R. D., Keppie, J. D., Cameron, K. L., Ortega-Rivera, A., Ortega-Gutiérrez, F., & Lee, J. W. K. (2005). Deformational history of the Granjeno Schist, Ciudad Victoria, Mexico: Constraints on the closure of the Rheic Ocean? International Geology Review, 47(9), 920-937.