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The Evolution of the Rheic Ocean: From Avalonian-Cadomian Active Margin to Alleghenian-Variscan Collision

GSA Special Papers

The Evolution of the Rheic Ocean: From Avalonian-Cadomian Active Margin to Alleghenian-Variscan Collision

Author(s)

Geological Society of America

Volume

423

DOI:

https://doi.org/10.1130/SPE423

Copyright:

Geological Society of America

ISBN print:

9780813724232

Publication date:

January 01, 2007

Book Chapter

Provenance of the Granjeno Schist, Ciudad Victoria, México: Detrital zircon U-Pb age constraints and implications for the Paleozoic paleogeography of the Rheic Ocean

Author(s)

R. Damian Nance

R. Damian Nance

1Department of Geological Sciences, 316 Clippinger Laboratories, Ohio University, Athens, Ohio 45701, USA

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Javier Fernández-Suárez

Javier Fernández-Suárez

2Departamento de Petrología y Geoquímica, Universidad Complutense, 28040 Madrid, Spain

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J. Duncan Keppie

J. Duncan Keppie

3Departamento de Geología Regional, Instituto de Geología, Universidad Nacional Autónoma de México, 04510 México D.F., México

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Craig Storey

4Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK

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Teresa E. Jeffries

Teresa E. Jeffries

5Department of Mineralogy, Natural History Museum, Cromwell Road, London, SW7 5BD, UK

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Doi:

https://doi.org/10.1130/2007.2423(22)

Published:

January 01, 2007

The Granjeno Schist of northeastern México is the oldest component of the Sierra Madre terrane and comprises polydeformed, pelitic metasedimentary and metavolcaniclastic rocks that enclose lenses of serpentinite-metagabbro. This low-grade Paleozoic assemblage is exposed in the core of a NNW-trending frontal anticline of the Laramide fold-thrust belt where it is tectonically juxtaposed against ca. 1 Ga granulites of the Novillo Gneiss. Silurian strata that unconformably overlie the Novillo Gneiss are unmetamorphosed and contain fauna of Gondwanan affinity.

LA-ICPMS (laser ablation inductively coupled plasma mass spectroscopy)U-Pb ages for detrital zircons from a Granjeno phyllite yield age populations that cluster in the...

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