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Palaeozoic palaeogeography of Mexico: constraints from detrital zircon age data

By
R. Damian Nance
R. Damian Nance
Department of Geological Sciences, 316 Clippinger Laboratories, Ohio University, Athens, Ohio 45701USA
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J. Duncan Keppie
J. Duncan Keppie
Departamento de Geologı́a Regional, Instituto de Geologı́a, Universidad Nacional Autonoma de México, 04510, México D.F., México
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Brent V. Miller
Brent V. Miller
Department of Geology and Geophysics, Texas A&M University, College Station, Texas 77843, USA
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J. Brendan Murphy
J. Brendan Murphy
Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, Canada, B2G 2W5
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Jaroslav Dostal
Jaroslav Dostal
Department of Geology, St. Mary's University, Halifax, Nova Scotia, Canada, B3H 3C3
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Published:
January 01, 2009

Abstract

Detrital zircon age populations from Palaeozoic sedimentary and metasedimentary rocks in Mexico support palinspastic linkages to the northwestern margin of Gondwana (Amazonia) during the late Proterozoic–Palaeozoic. Age data from: (1) the latest Cambrian-Pennsylvanian cover of the c. 1 Ga Oaxacan Complex of southern Mexico; (2) the ?Cambro-Ordovician to Triassic Acatlán Complex of southern Mexico's Mixteca terrane; and (3) the ?Silurian Granjeno Schist of northeastern Mexico's Sierra Madre terrane, collectively suggest Precambrian provenances in: (1) the c. 500–650 Ma Brasiliano orogens and c. 600–950 Ma Goias magmatic arc of South America, the Pan-African Maya terrane of the Yucatan Peninsula, and/or the c. 550–600 Ma basement that potentially underlies parts of the Acatlán Complex; (2) the Oaxaquia terrane or other c. 1 Ga basement complexes of the northern Andes; and (3) c. 1.4–3.0 Ga cratonic provinces that most closely match those of Amazonia. Exhumation within the Acatlán Complex of c. 440–480 Ma granitoids prior to the Late Devonian–early Mississippian, and c. 290 Ma granitoids in the early Permian, likely provided additional sources in the Palaeozoic. The detrital age data support the broad correlation of Palaeozoic strata in the Mixteca and Sierra Madre terranes, and suggest that, rather than representing vestiges of Iapetus or earlier oceanic tracts as has previously been proposed, both were deposited along the southern, Gondwanan (Oaxaquia) margin of the Rheic Ocean and were accreted to Laurentia during the assembly of Pangaea in the late Palaeozoic.

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Contents

Geological Society, London, Special Publications

Ancient Orogens and Modern Analogues

J. B. Murphy
J. B. Murphy
St Francis Xavier University, Canada
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J. D. Keppie
J. D. Keppie
Universidad Nacional Autonoma de Mexico, Mexico
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A. J. Hynes
A. J. Hynes
McGill University, Canada
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Geological Society of London
Volume
327
ISBN electronic:
9781862395756
Publication date:
January 01, 2009

GeoRef

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