Origin and provenance of basement metasedimentary rocks from the Xolapa Complex: New constraints on the Chortis–southern Mexico connection

Talavera-Mendoza, Óscar; Ruíz, Joaquin; Corona-Chávez, Pedro; Gehrels, George E.; Sarmiento-Villagrana, Alicia; García-Díaz, José Luis; Salgado-Souto, Sergio Adrián

doi:10.1016/j.epsl.2013.03.021

Cited by 36 publications

(19 citation statements)

References 36 publications

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“…The Pacific margin of Mexico from ~106°W to the Tehuantepec isthmus at ~94°W is characterized by wide exposures of Mesozoic metavolcanic arc sequences and metasedimentary rocks of Jurassic and Cretaceous protolith ages, and these rocks are intruded by Late Cretaceous to Miocene plutons (Talavera-Mendoza et al, 2013;Ducea et al, 2004;Morán-Zenteno et al, 2000;Herrmann et al, 1994). The Cretaceous to Miocene intrusions, as well as regional metamorphism, overprint a previously assembled mosaic of older tectonic elements defined by Campa and Coney (1983) as the Guerrero, Mixteco, Oaxaca, and Maya terranes (Fig.…”

Section: Discussionmentioning

confidence: 99%

Geology of the coastal Chiapas (Mexico) Miocene plutons and the Tonalá shear zone: Syntectonic emplacement and rapid exhumation during sinistral transpression

et al. 2015

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Late Miocene plutons in coastal Chiapas, Mexico, represent the roots of an extinct magmatic arc. Miocene granitoids of calc-alkaline composition and arc chemistry intruded into and were deformed within the Tonalá mylonite belt in the middle to upper crust. The mylonite belt is a crustal-scale shear zone extending along the western margin of the Chiapas Massif for ~150 km. Deformation is characterized by a dominantly subhorizontal lineation and subvertical foliation along a strikingly linear zone that trends ~310°. Mylonitic fabrics contain ambiguous but dominantly sinistral shear indicators. Intrusions are interpreted as syntectonic on the basis of similar U-Pb zircon crystallization age estimates (ca. 10 Ma) and the cooling age estimates obtained on neoformed micas in the mylonite. The plutons are elongated, their long axis is parallel to shear zone, and some plutons show markedly asymmetric outcrop patterns, with sheared tails that trail behind the intrusions and that are consistent with sinistral displacement. Parts of plutons were mylonitized by continuous deformation in the Tonalá shear zone, locally developing intricate pseudotachylyte and cataclasite veins slightly oblique to the mylonite foliation. Outside of the shear zone, plutons preserve magmatic fabrics. These observations are consistent with features common to syntectonic granites interpreted to have been emplaced along strike-slip shear zones in a transpressional setting. We interpret the Tonalá mylonites as representing a relict transform boundary that was slightly oblique to the Polochic-Motagua fault system, which accommodated over 100 km of sinistral displacement between the Chortis block (on the Caribbean plate) and Chiapas (on the North America plate) in late Miocene time.

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Section: Discussionmentioning

confidence: 99%

Geology of the coastal Chiapas (Mexico) Miocene plutons and the Tonalá shear zone: Syntectonic emplacement and rapid exhumation during sinistral transpression

et al. 2015

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“…[] and Talavera‐Mendoza et al . [] further suggest that these events are associated with the main episode of migmatization in the Xolapa Complex, although a mechanism for this high‐grade metamorphic event was not presented. We suggest that they are the thermal consequences of the development of the Guerrero slab window.…”

Section: Discussionmentioning

confidence: 99%

“…An important consequence of the formation of a slab window is its thermal effect on the upper plate as the hot asthenospheric mantle ascending through the gap between the two slab edges may increase the ambient temperature by several hundreds of degrees [ Groome and Thorkelson , ]. A significant thermal event has been long recognized in the metamorphic rocks of the Xolapa complex in the Paleocene [e.g., Herrmann et al ., ] and has been more recently documented by Pb loss in zircons from orthogneiss [ Pérez‐Gutiérrez et al ., ], rim growth in detrital zircons [ Talavera‐Mendoza et al ., ], and intrusion of garnet‐muscovite leucogranites, pegmatites [ Solari et al ., ], felsic sills, and aplite dikes ( this work ). Herrmann et al .…”

Section: Discussionmentioning

confidence: 99%

Late Cretaceous-Oligocene magmatic record in southern Mexico: The case for a temporal slab window along the evolving Caribbean-North America-Farallon triple boundary

et al. 2014

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Continental magmatism in southern Mexico is expected to record the eastward displacement of the Farallon-North America-Caribbean triple junction. However, a trench-transversal belt of magmatism in the central western Guerrero State does not fit into a regular pattern of arc migration and reorientation following the formation of the WSW trending Acapulco trench in the Cenozoic. We revised the magmatic pattern of southern Mexico using an updated database and new laser ablation inductively coupled plasma-mass spectrometry sensitive high-resolution ion microprobe, Ar-Ar ages, and geochemical and geologic data for the coastal part of the anomalous Guerrero belt. Our data reveal a persistent magmatic activity between~75 and 35 Ma, with a changing character at the Paleocene-Eocene boundary (circa 56 Ma). Late Cretaceous-Paleocene granitoids have an adakitic signature imprinted by stable garnet in the source and show no plagioclase fractionation, indicative of wet and oxidized magmas. Eocene rocks consist of an almost bimodal suite of plutonic bodies covered by a succession of mafic lavas. Granitic plutons show plagioclase fractionation and flat middle rare earth element-heavy rare earth element; gabbros have a tholeiitic character, indicative of dryer and more reduced magmas. They appear later and were emplaced at shallow depth in an extensional sedimentary basin. We interpret the magmatic record of the Guerrero belt as the response to two concurrent processes: (1) a temporal window in the Farallon slab induced by the concurrent subduction along the two noncollinear trench segments of southern Mexico (WNW trending) and of the Chortís block (NNW trending) and (2) a scissor-like transtensional rifting associated to counterclockwise rotation and eastward motion of the Chortís block.

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“…Xolapa consists primarily of amphibolite facies gneiss and migmatite, with protoliths of Jurassic and Early Cretaceous age, intruded by a suite of eastward younging calc-alkaline plutons (TALAVERA-MENDOZA et al 2013;SCHAAF et al 1995). It has been interpreted as the roots of a Jurassic-Early Cretaceous continental arc.…”

Section: Terranes In Southern Mexicomentioning

confidence: 99%

Low Angle Contact Between the Oaxaca and Juárez Terranes Deduced From Magnetotelluric Data

Arzate-Flores

Molina-Garza

Corbo-Camargo

et al. 2016

Pure Appl. Geophys.

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We present the electrical resistivity model along a profile perpendicular to the Middle America trench in southern Mexico that reveals previously unrecognized tectonic features at upper to mid-crustal depths. Our results support the hypotheses that the upper crust of the Oaxaca terrane is a residual *20 km thick crust composed by an *10 km thick faulted crustal upper layer and an *10 km thick hydrated and/or mineralized layer. Oaxaca basement overthrust the younger Juárez (or Cuicateco) terrane. The electrical resistivity model supports the interpretation of a slab subducting at a low angle below Oaxaca. Uplift in the Oaxaca region appears to be related to fault reactivation induced by low angle subduction. In the Juárez terrane, isostatic forces may contribute to uplift because it is largely uncompensated. In the Sierra Madre del Sur, closer to the coast, uplift is facilitated by slabdehydration driven buoyancy. Both gravity and resistivity models are consistent with a thinned upper crust in the northeast end of the profile.

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Origin and provenance of basement metasedimentary rocks from the Xolapa Complex: New constraints on the Chortis–southern Mexico connection

Cited by 36 publications

References 36 publications

Geology of the coastal Chiapas (Mexico) Miocene plutons and the Tonalá shear zone: Syntectonic emplacement and rapid exhumation during sinistral transpression

Geology of the coastal Chiapas (Mexico) Miocene plutons and the Tonalá shear zone: Syntectonic emplacement and rapid exhumation during sinistral transpression

Late Cretaceous-Oligocene magmatic record in southern Mexico: The case for a temporal slab window along the evolving Caribbean-North America-Farallon triple boundary

Low Angle Contact Between the Oaxaca and Juárez Terranes Deduced From Magnetotelluric Data

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