Subduction of Proterozoic to Late Triassic continental basement in the Guatemala suture zone: A petrological and geochronological study of high-pressure metagranitoids from the Chuacús complex

Maldonado, Roberto; Ortega-Gutiérrez, Fernando; Ortíz-Joya, Guillermo A.

doi:10.1016/j.lithos.2018.02.030

Cited by 25 publications

(7 citation statements)

References 69 publications

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“…The timing of eclogite facies metamorphism in the Chuacús Complex has been dated with the Lu‐Hf method on garnet and whole‐rock aliquots from eclogite at 101 ± 3 and 95 ± 2 Ma, whereas zircon, monazite and titanite U–Pb ages indicate later‐stage events at c. 80–74 Ma (Maldonado, Weber, et al, 2018). Zircon dating of meta‐granitoids associated with eclogites showed protolith ages of c. 1.1–1.0 Ga and c. 224 Ma (Maldonado, Ortega‐Gutiérrez et al, 2018; Solari et al, 2011). Tectonic reconstructions for the Cretaceous period suggest proximity between the southern CMC and the Chuacús Complex during the evolution of the Caribbean region, as both comprised the southern portion of the Maya Block (Maldonado, Ortega‐Gutiérrez, et al, 2018; Maldonado, Weber, et al, 2018; Martens et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Multi‐episodic formation of baddeleyite and zircon in polymetamorphic anorthosite and rutile‐bearing ilmenitite from the Chiapas Massif Complex, Mexico

León

Schmitt

Weber

2022

Journal Metamorphic Geology

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Massif‐type anorthosite and comagmatic associations of rutile‐bearing ilmenitite (RBI) and oxide‐apatite‐rich amphibolite (OARA) from the Chiapas Massif Complex (CMC) in southeastern Mexico display a protracted billion‐year accessory mineral record encompassing magmatic crystallization at c. 1.0 Ga to recent ductile shear deformation at c. 3.0 Ma. Multiple discrete zircon populations between these age end‐members resulted from neoformation/recrystallization during local to regional metamorphism that affected the southeastern portion of the CMC. The ubiquitous presence of relict baddeleyite (ZrO2), along with various zircon generations spatially associated with pristine to partly retrogressed Zr‐bearing igneous and metamorphic minerals (e.g., ilmenite, rutile, högbomite and garnet), suggests significant Zr diffusive re‐equilibration (exsolution) during slow cooling and mineral breakdown followed by crystallization of baddeleyite. The subsequent transformation of baddeleyite into zircon was likely driven by reaction with Si‐bearing fluids in several geochronologically identified metamorphic stages. Strikingly contrasting compositional signatures in coeval zircon from anorthosite (silicate‐dominated) and comagmatic RBI (Ti‐Fe‐oxide‐dominated) indicate a major role of fluids locally equilibrating with the rock matrix, as indicated by distinct zircon trace element and oxygen isotopic compositions. A high‐grade metamorphic event at c. 950 Ma is likely responsible for the formation of coarse‐grained rutile (~0.1–10 mm in diameter), srilankite, zircon and garnet with rutile inclusions as well as metamorphic högbomite surrounding Fe‐Mg spinel. Zr‐in‐rutile minimum temperatures suggest >730°C for this event, which may correlate to rutile‐forming granulite facies metamorphism in other Grenvillian‐aged basement rocks in Mexico and northern South America. A younger generation of baddeleyite exsolution occurred during post‐peak cooling of coarse‐grained rutile, reflected in rimward Zr depletion and formation of discontinuous baddeleyite coronas. Baddeleyite around rutile was then transformed into zircon possibly during subsequent metamorphism at c. 920 or 620 Ma, resulting from syn‐kinematic and contact metamorphism, respectively. Regional metamorphism at c. 450 and 250 Ma extensively overprinted the existing zircon population, especially during the Triassic event, as suggested by a significant presence of zircon with this age. Nearly pristine baddeleyite occurring interstitial to ilmenite yielded an isochron age of c. 232 Ma according to in situ U–Pb secondary ion mass spectrometry (SIMS), suggesting either formation during metamorphic peak conditions or post‐peak cooling. Zircon with ages of c. 80–100 Ma in anorthosite is identified for the first time within the CMC and coincides with cooling ages of c. 100 Ma for coarse‐grained rutile. This age is similar to those of rocks occurring ~200 km further to the east in Guatemala, which are also bounded to the Polochic fault system but overprinted by eclogite facies metam...

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Section: Discussionmentioning

confidence: 99%

Multi‐episodic formation of baddeleyite and zircon in polymetamorphic anorthosite and rutile‐bearing ilmenitite from the Chiapas Massif Complex, Mexico

León

Schmitt

Weber

2022

Journal Metamorphic Geology

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“…The Late Triassic–Middle Jurassic cooling of the OC is coeval with the break‐up of Pangea (including also the initial opening of the Gulf of Mexico during the Jurassic; e.g. Bird & Burke, 2006; Cochrane et al., 2014; Maldonado, Ortega‐Gutiérrez, & Ortíz‐Joya, 2018; Martini & Ortega‐Gutiérrez, 2018; Michalzik, 1991; Spikings et al., 2015; Steiner, 2005). In the southern and south‐eastern parts of Mexico, there is no reported magmatic evidence for the break‐up of Pangea during the Late Triassic.…”

Section: Discussionmentioning

confidence: 99%

“…Palaeogeographic model displaying the initial rupture of Pangea during the Late Triassic (modified after Cochrane et al., 2014; Maldonado et al., 2018; Spikings et al., 2015)…”

Section: Discussionmentioning

confidence: 99%

Mesozoic exhumation history of the Grenvillian Oaxacan Complex, southern Mexico

et al. 2020

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We present the first fission‐track results from the Grenvillian Oaxacan Complex, southern Mexico. Time–temperature modelling of the data indicates that two significant Mesozoic cooling episodes are recorded in the Oaxacan Complex and these are interpreted as resulting from exhumation. The older cooling event took place from the Late Triassic to Middle Jurassic and is possible linked to the break‐up of Pangea (including the initial opening of the Gulf of Mexico during the Jurassic). The younger exhumation period in the Early Cretaceous is contemporaneous with the final stages of rifting of the Gulf of Mexico. Key stratigraphic records also provide independent evidence for these exhumation episodes. In our view, both Mesozoic rapid exhumation events were controlled by the activity of the Caltepec Fault Zone and the Oaxaca Fault. Our data suggest that both these large fault systems have remained active since, at least, the Late Triassic.

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“…Farther south, in tectonic contact along the Baja Verapaz Shear Zone (Ortega-Obregón et al, 2008), the Jacalteco terrane is mostly made up by the Chuacús Complex, containing Precambrian to Triassic metamorphic protoliths, and affected by ca. 218 Ma decompression melting and migmatization and Late Cretaceous high-pressure metamorphism (Ortega-Gutiérrez et al, 2004;Ratschbacher et al, 2009;Solari et al, 2011;Maldonado et al, 2018). South of the Motagua fault the Sula terrane is a completely different entity, made up almost entirely by the Las Ovejas Complex (Torres de León et al, 2012), characterized by medium to high-grade metasediments (Paleozoic to Jurassic protolith ages) metamorphosed under high temperature-low pressure during the Oligocene, and associated with Jurassic to Cretaceous plutons, with or without deformation (e.g., Ratschbacher et al, 2009).…”

Section: Geologic Settingmentioning

confidence: 99%

La Unión Monzogranite: geochronology and significance of the Jurassic arc in the Sula Terrane, Guatemala

Salguero-Díaz¹,

Solari²,

Vásquez³

et al. 2022

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La Unión pluton (LUP) belongs to the metamorphic and igneous Sula Terrane (ST) of Central Guatemala, limited to the north by the Motagua fault (MF) and to the south by the Jocotán-Chamelecón fault system (J-CH-FS). The basement of the ST is characterized by the high-grade metamorphic rocks belonging to the Las Ovejas Complex and the extensive low-grade San Diego phyllite, the latter in tectonic contact with LUP. A combination of field data, petrographic and geochemical analyses as well as geochronologic dating by U-Pb method, allow to classify LUP as a monzogranite with an age of 170 Ma (average of two dated samples), characterized by high-K calcalkaline and peraluminous affinity and with a REE pattern typical of a continental magmatic arc. Some trace-elements behavior and a comparison of similar-age units found elsewhere in eastern, central and southern Mexico, allow to associate its formation to the lithospheric thinning and extension that occurred during the breakup of Pangea and the opening of the Gulf of Mexico.

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Subduction of Proterozoic to Late Triassic continental basement in the Guatemala suture zone: A petrological and geochronological study of high-pressure metagranitoids from the Chuacús complex

Cited by 25 publications

References 69 publications

Multi‐episodic formation of baddeleyite and zircon in polymetamorphic anorthosite and rutile‐bearing ilmenitite from the Chiapas Massif Complex, Mexico

Multi‐episodic formation of baddeleyite and zircon in polymetamorphic anorthosite and rutile‐bearing ilmenitite from the Chiapas Massif Complex, Mexico

Mesozoic exhumation history of the Grenvillian Oaxacan Complex, southern Mexico

La Unión Monzogranite: geochronology and significance of the Jurassic arc in the Sula Terrane, Guatemala

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