Garnet–chloritoid–paragonite metapelite from the Chuac us Complex (Central Guatemala): new evidence for continental subduction in the North America–Caribbean plate boundary

Maldonado, Roberto; Ortega-Gutiérrez, Fernando; Hernández‐Uribe, David

doi:10.1127/ejm/2016/0028-2578

Cited by 14 publications

(2 citation statements)

References 61 publications

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“…Our modelling does not predict its formation in average MORB composition, similar to other models (Forneris & Holloway, ; Hacker, ; Hacker et al, ), as chloritoid requires more Mg‐ and Al‐rich bulk‐rock compositions (e.g. subducted pelites; Maldonado, Ortega‐Gutierrez, & Hernández‐Uribe, ). We therefore propose that chloritoid should not be considered as a major contributor to water transport from the Earth's surface to its shallow interior (cf.…”

Section: Discussionsupporting

confidence: 76%

A revised petrological model for subducted oceanic crust: Insights from phase equilibrium modelling

Hernández‐Uribe

Palin

2019

Journal Metamorphic Geology

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Many geological and geodynamical studies of metamorphism in subduction zones have relied upon worldwide compilations of modelled slab-top pressure-temperature (P-T) conditions, although recent evaluation of such data sets suggests that these predictions are ~100-300°C colder at any given pressure than the conditions recorded by exhumed metamorphic rocks. As such, geochemical, petrological and geo-

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Section: Discussionsupporting

confidence: 76%

A revised petrological model for subducted oceanic crust: Insights from phase equilibrium modelling

Hernández‐Uribe

Palin

2019

Journal Metamorphic Geology

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“…However, kyanite stabilization in metapelites is known to be sensitive to minor changes in the H2O content (e.g. Maldonado et al, 2016), hence a P-H2O phase diagram at 660 °C (Fig. 7b) was constructed to evaluate its influence on the calculated assemblages.…”

Section: Metapelites A37 and A57mentioning

confidence: 99%

Petrology and U–Pb geochronology of high-grade metavolcano-sedimentary rocks from central Xolapa Complex, southern Mexico

Maldonado

Corona-Chávez

Solari

et al. 2020

Lithos

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The Xolapa Complex (XC) is a high-grade metamorphic belt exposed along the southern margin of the North American plate in Mexico. Its evolution includes an episode of widespread anatexis related to crustal thickening and uplift from middle to lower crustal levels during the Paleocene.On the basis of field and petrographic work, this study integrates a petrological modelling approach with zircon and monazite LA-ICP-MS U-Pb geochronology to elucidate the tectonothermal evolution of the central region of this belt. The study area includes a sequence of alternating migmatitic paragneiss and garnet-bearing mafic schist, which is interpreted to represent an Early-Cretaceous (Valanginian-Hauterivian) meta-volcano-sedimentary succession.Petrographic evidence and phase equilibria calculations demonstrate that a staurolite-kyanite grade metamorphism occurred at ~640-670 °C and 8-9 kbar before to widespread migmatization took place. Differential anatexis of fertile and refractory layers occurred progressively via biotite and amphibole dehydration-melting reactions, and continued during peak metamorphism at granulite-facies conditions of ~800-820 °C and ~5-7 kbar. Melt generation/mobilization progressed during cooling until crystallize at ~700 °C, according to Ti-in zircon-thermometry. In order to link U-Pb ages to metamorphic stages, zircon and monazite from different migmatite components were analyzed and chemical fingerprints were used. The age of prograde metamorphism is poorly constrained due to limited preservation of zircon and monazite, but likely occurred during the mid-to Late Cretaceous. Cooling and melt crystallization recorded by leucosome zircon occurred at 61.8±0.6 Ma. Both zircon and low-Y monazite from whole rock 2 and melanosome portions, respectively, are consistent with an episode of growth around 60.9±0.5Ma, but monazite continued to grow/recrystallize for a period of ca. 10 Ma. Thin Oligocene (~34-26 Ma) zircon and high-Y monazite rims are interpreted to reflect a stage of reheating by magmatic advection related to arc plutonism in the region. The results suggest the affinity of the central XC with other Early-Cretaceous volcano-sedimentary basins of central-southern Mexico.A period of crustal thickening would have buried the sequence at depths of ~30 km, causing Barrovian-type metamorphism during mid-to Late Cretaceous time and, eventually, anatexis that evolved at granulite-facies conditions during orogenic collapse in the Paleocene (≥62 Ma). The time span from leucosome crystallization to late-stage reheating in central XC would imply a protracted high-temperature evolution indicating middle-to upper crust residence time of at least ca. 30 Ma.

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Metamorphic Facies and Facies Series

Okrusch

Frimmel

2020

Springer Textbooks in Earth Sciences, Geography and Environment

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Garnet–chloritoid–paragonite metapelite from the Chuac us Complex (Central Guatemala): new evidence for continental subduction in the North America–Caribbean plate boundary

Cited by 14 publications

References 61 publications

A revised petrological model for subducted oceanic crust: Insights from phase equilibrium modelling

A revised petrological model for subducted oceanic crust: Insights from phase equilibrium modelling

Petrology and U–Pb geochronology of high-grade metavolcano-sedimentary rocks from central Xolapa Complex, southern Mexico

Metamorphic Facies and Facies Series

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