Geocronología de circones detríticos de diferentes localidades del Esquisto Granjeno en el noreste de México

Barboza-Gudiño, José Rafael; Ramírez-Fernández, Juan Alonso; Torres-Sánchez, Sonia Alejandra; Valencia, Víctor A.

doi:10.18268/bsgm2011v63n2a5

Cited by 31 publications

(37 citation statements)

References 10 publications

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“…These rocks demonstrate that the closure of the Rheic Ocean, in the area of actual northeastern Mexico, did not result in continent-continent collision during the middle to late Paleozoic. It rather brought the northwestern margin of Gondwana into contact with the Paleo-Pacific Ocean [18,19,36,37].…”

Section: Geological Settingmentioning

confidence: 99%

“…Depositional contacts of clastic (continental) metasedimentary rocks with metavolcanic rocks throughout the Granjeno Schist suggest that sedimentation was contemporaneous with the volcanism. The age of the basaltic rocks reamin unknown, but maximum depositional ages of the coeval metasedimentary rocks are late Cambrian to Devonian [18,75], indicating a composite unit with a long possible sedimentation and volcanism history. Grenvillian (1250-920 Ma) and Panafrican (730-530 Ma) detrital zircon crystallization ages suggest that the Novillo Gneiss of the Oaxaquia microcontinent and the Gondwana continent may have been the main sediment sources [18,75].…”

Section: Correlation Of the Meta-ultramafic Rocks With Metavolcanic Amentioning

confidence: 99%

“…As result dextral transpression took place and a Pennsylvanian-Permian magmatic arc was established (cf. [14,15,18,77,78]). The metamorphic age of the Granjeno Schist indicates that the metamorphic overprint and the second serpentinization event of the rocks of the present study may have taken place in an accretionary prism during Pennsylvanian to Permian times (cf.…”

Section: Correlation Of the Meta-ultramafic Rocks With Metavolcanic Amentioning

confidence: 99%

“…Even though several studies have examined the Paleozoic (Silurian to Carboniferous) basement rocks of northeastern Mexico, [2][3][4][5][6][7][8][9][10][11] the evolution of the ultramafic paleozoic rocks has received minor attention; therefore this topic should be furtherly studied [11][12][13][14][15][16][17][18]. It is commonly accepted that metamorphism including serpentinization of the Granjeno Schist, a metavolcanic and metasedimentary unit of 300±4 Ma metamorphic age, was related to the closure of the Rheic Ocean and the resulting formation of Pangaea.…”

Section: Introductionmentioning

confidence: 99%

“…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]. No particular attention has been entirely paid to the significance of the serpentinite bodies within the Granjeno Schist.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Geological Settingmentioning

confidence: 99%

Section: Correlation Of the Meta-ultramafic Rocks With Metavolcanic Amentioning

confidence: 99%

Section: Correlation Of the Meta-ultramafic Rocks With Metavolcanic Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Magmatic source and metamorphic grade of metavolcanic rocks from the Granjeno Schist: was northeastern Mexico a part of Pangaea?

et al. 2015

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The geochemistry of the metavolcanic rocks from the Granjeno Schist in northeastern Mexico indicates an origin in different tectonic environments: mid‐ocean ridge and ocean island. High ratios of Hf/Th and Th/Nb (4.4–14 and 0.08–0.15), low ratios of LaN/YbN and LaN/SmN (0.74–1.7 and 0.60–1.4) and depleted LREE patterns in metabasalt display mid‐ocean ridge characteristics. In contrast, the pattern of trace‐element ratios and REEs in metabasalt and metapillow lava 60 km to the west indicates a magma source with ocean‐island basalt characteristics. Both areas were metamorphosed during the Late Carboniferous (300 ± 4 Ma). Estimated metamorphic conditions deduced from white mica and chlorite compositions, distinguish greenschist facies (350 °C and 4 kbar) for the mid‐ocean ridge basalt, and prehnite–pumpellyite facies (250 °C and 2.5 kbar) for the ocean‐island‐type basalt. This metamorphism took place at an active continental margin during Pennsylvanian time. Our new tectonic model, which differs from earlier models, suggests that the origin of the Granjeno Schist is related to a subduction zone located at the western margin of Pangaea, active after Laurentia–Gondwana collision. Copyright © 2015 John Wiley & Sons, Ltd.

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Geochemistry and detrital zircon geochronology of metasedimentary rocks in the Sierra Madre Terrane, Mexico: Implications of deposition along the western margin of Pangea

et al. 2021

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The basement complex of the Sierra Madre region in north-eastern Mexico is classified into four domains: (a) granulite facies rocks of Grenville age (ca. 1 Ga) known as the Novillo Gneiss, (b) the Palaeozoic Granjeno Schist, (c) an unmetamorphosed succession of Palaeozoic marine siliciclastic and volcanic rocks, and (d) an Ordovician plagiogranite body. We present a geochemical and provenance study of the metasedimentary rocks of the Granjeno Schist, which are associated with metavolcanic and meta-ultramafic rocks. In the Granjeno Schist, trace element ratios (Th/Sc, La/Sch, La/Sc, and Zr/Sc) and REE compositions of the metasedimentary rocks are similar to values for the mean continental crust values and are consistent with derivation of detritus from felsic rocks. Chemical index of alteration values of 30-80 indicates low to moderate weathering of the source. The clastic metasedimentary rocks have moderately radiogenic Nd-isotopic compositions with initial εNd(t) values of −9 to −6, and model ages between 1.5 and 1.7 Ga. Ages of detrital zircon grains from the metasedimentary rocks are mostly 1.6-1.1 Ga, but some ages are 530-410 Ma. Such a Novillo Gneiss-like age spectrum argues for short transport for the majority of zircon grains, with potential additional transport from the Maya Block. Na-amphibole and mica geobarometer results of up to 6 kbar indicate high-pressure subduction-related metamorphism of the Granjeno Schist that was followed by a Pennsylvanian-Permian sub-greenschist to greenschist metamorphic overprint in an accretionary prism. Thus, the Granjeno Schist is a representative of ocean-plate stratigraphy that originated proximally close to a continent.

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Geocronología de circones detríticos de diferentes localidades del Esquisto Granjeno en el noreste de México

Cited by 31 publications

References 10 publications

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

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

Magmatic source and metamorphic grade of metavolcanic rocks from the Granjeno Schist: was northeastern Mexico a part of Pangaea?

Geochemistry and detrital zircon geochronology of metasedimentary rocks in the Sierra Madre Terrane, Mexico: Implications of deposition along the western margin of Pangea

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