Late Paleozoic subduction and exhumation of Cambro-Ordovician passive margin and arc rocks in the northern Acatlán Complex, southern Mexico: Geochronological constraints

Keppie, J. Duncan; Nance, R. Damian; Ramos-Arias, Mario; Lee, J.K.W.; Dostál, J.; Ortega‐Rivera, Amabel; Murphy, J. Brendan

doi:10.1016/j.tecto.2010.09.019

Cited by 26 publications

(11 citation statements)

References 43 publications

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“…As a result, Rheic closure, which is marked by the Early Mississippian exhumation of high-pressure rocks representing the Ordovician rift-shelf sequence of the Gondwana continental margin (e.g., Keppie et al, 2010), was followed by dextral transpression and the coeval development of a Permian magmatic arc, which is thought to record the onset of oblique subduction of the paleo-Pacific brought about by Pangea assembly (Keppie et al, in press).…”

Section: Terminal Collisionmentioning

confidence: 99%

A brief history of the Rheic Ocean

Nance

Gutiérrez-Alonso

Keppie

et al. 2012

Geoscience Frontiers

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The Rheic Ocean was one of the most important oceans of the Paleozoic Era. It lay between Laurentia and Gondwana from the Early Ordovician and closed to produce the vast OuachitaAlleghanian-Variscan orogen during the assembly of Pangea. Rifting began in the Cambrian as a continuation of Neoproterozoic orogenic activity and the ocean opened in the Early Ordovician with the separation of several Neoproterozoic arc terranes from the continental margin of northern Gondwana along the line of a former suture. The rapid rate of ocean opening suggests it was driven by slab pull in the outboard Iapetus Ocean. The ocean reached its greatest width with the closure of Iapetus and the accretion of the periGondwanan arc terranes to Laurentia in the Silurian. Ocean closure began in the Devonian and continued through the Mississippian as Gondwana sutured to Laurussia to form Pangea. The ocean consequently plays a dominant role in the Appalachian-Ouachita orogeny of North America, in the basement geology of

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Section: Terminal Collisionmentioning

confidence: 99%

A brief history of the Rheic Ocean

Nance

Gutiérrez-Alonso

Keppie

et al. 2012

Geoscience Frontiers

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247

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“…It is thus probable that these units contain detritus derived from the same sources (Keppie et al, 2008b). On the other hand, Keppie et al (2008bKeppie et al ( , 2010 proposed that DevonianLower Carboniferous zircons of the metasedimentary rocks in the Acatlán complex were derived from a magmatic arc on the western margin of Pangea that was partially removed by subduction erosion.…”

Section: Provenancementioning

confidence: 99%

“…There are also Middle American variants of the Pangea-A model with southern Mexico placed either on the western margin of Pangea (e.g. Keppie, 2004;Keppie et al, 2008bKeppie et al, , 2010Fig. 1b) or within Pangea between the Maya terrane and southern North America (TalaveraMendoza et al, 2005;Vega-Granillo et al, 2007Fig.…”

Section: Introductionmentioning

confidence: 99%

U–Pb geochronological constraints on the Triassic–Jurassic Ayú Complex, southern Mexico: Derivation from the western margin of Pangea-A

et al. 2012

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“…The magmatism was probably associated with plate movements related to the closure of the Rheic Ocean, supporting the migration of the southwestern margin of Gondwana into the PaleoPacific Ocean [20,21]. The southwestern margin of Gondwana changed from passive to active with the development of an oblique subduction system during the Pennsylvanian [14,18,22]. Based on field relationships, petrographic and isotopic characterization of metasedimentary and metavolcanic rocks, it is possible to estimate that the Granjeno Schist was integrated and metamorphosed in an accretionary prism during this time [1,13,14,17,18,[23][24][25].…”

Section: Introductionmentioning

confidence: 66%

Petrology and geochemistry of meta-ultramafic rocks in the Paleozoic Granjeno Schist, northeastern Mexico: Remnants of Pangaea ocean floor

et al. 2017

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Abstract:The Granjeno Schist is a meta-volcanosedimentary upper Paleozoic complex in northeastern Mexico. We suggest different tectonic settings for metamorphism of its serpentinite and talc-bearing rocks based on petrographic and geochemical compositions. According to the REE ratios (La N /Yb N = 0.51-20.0 and La N /Sm N = 0.72-9.1) and the enrichment in the highly incompatible elements Cs (0.1 ppm), U (2.8 ppm), and Zr (60 ppm) as well as depletion in Ba (1 -15 ppm), Sr (1 -184 ppm), Pb (0.1 -14 ppm), and Ce (0.1 -1.9 ppm) the rocks have mid-ocean ridge and subduction zones characteristics. The serpentinite contains Al-chromite, ferrian chromite and magnetite. The Al-chromite is characterized by Cr# of 0.48 to 0.55 suggesting a MORB origin, and Cr# of 0.93 to 1.00 for the ferrian chromite indicates a prograde metamorphism. We propose at least two serpentinization stages of lithospheric mantle for the ultramafic rock of the Granjeno Schist, (1) a first in an ocean-floor environment at sub-greenschist to greenschist facies conditions and (2) later a serpentinization phase related to the progressive replacement of spinel by ferrian chromite and magnetite at greenschist to low amphibolite facies conditions during regional metamorphism. The second serpentinization phase took place in an active continental margin during the Pennsylvanian. We propose that the origin of the ultramafic rocks is related to an obduction and accretional event at the western margin of Pangea.

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Late Paleozoic subduction and exhumation of Cambro-Ordovician passive margin and arc rocks in the northern Acatlán Complex, southern Mexico: Geochronological constraints

Cited by 26 publications

References 43 publications

A brief history of the Rheic Ocean

A brief history of the Rheic Ocean

U–Pb geochronological constraints on the Triassic–Jurassic Ayú Complex, southern Mexico: Derivation from the western margin of Pangea-A

Petrology and geochemistry of meta-ultramafic rocks in the Paleozoic Granjeno Schist, northeastern Mexico: Remnants of Pangaea ocean floor

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