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

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 journal › Article

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 (D_2a-D_2c) 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 language	English
Pages (from-to)	920-937
Number of pages	18
Journal	International Geology Review
Volume	47
Issue number	9
Publication status	Published - Sep 2005

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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.

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title = "Deformational history of the Granjeno Schist, Ciudad Victoria, Mexico: Constraints on the closure of the Rheic Ocean?",

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.",

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AU - Cameron, K. L.

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