Evolución geológica mesozoica del Complejo Xolapa al norte de Acapulco, sur de México: implicaciones para las reconstrucciones paleogeográficas

Rosalva Pérez-Gutiérrez, Luigi Augusto Solari, Arturo Gómez-Tuena, Uwe Martens

Resultado de la investigación: Contribución a una revistaArtículo

22 Citas (Scopus)

Resumen

The Xolapa Complex in the Acapulco-Tierra olorada area, southern Mexico, is made up of orthogneisses and paragneisses, both affected by a variable degrees of migmatization. These rocks are intruded by several episodes of Jurassic-Oligocene, calc-alkaline granitic magmatism. Three phases of ductile deformation affected the gneisses and migmatites. D1 produced an amphibolite-facies metamorphic banding (M1) and a penetrative S1 foliation, axial planar to isoclinal, recumbent F1 folds with axes parallel to a NE to NW, gently plunging, L1 stretching lineation. D2 consists of a S2 foliation defined by hornblende, biotite and garnet, synchronous with M2 migmatization that generated leucosomes, which are generally parallel to S1. D3 is made up of asymmetric, chevron F3 folds that deform the composite S1/S2 foliation during greenschist to lower amphibolite metamorphism (M3). U-Pb SHRIMP (Sensitive High-Resolution Ion Micropobe) geochronology carried out on zircon separated from two orthogneisses yielded an Early Jurassic magmatic event (178.7 ± 1.1 Ma) and the age of migmatization (133.6 ± 0.9 Ma). Two episodes of Pb loss were also recognized, the first at 129.2 ± 0.4 Ma, and the second during the earliest Paleocene (61.4 ± 1.5 Ma); they are probably associated with two episodes of magmatism. The Early Jurassic magmatic arc may be correlated with a magmatic arc in the eastern Guerrero terrane. The Early Cretaceous migmatization is inferred to have resulted from shortening, possibly due to the accretion of an exotic block, such as the Chortís block along whose northern margin contemporaneous, high-pressure metamorphism has been recorded.

Idioma originalEspañol
Páginas (desde-hasta)201-221
Número de páginas21
PublicaciónRevista Mexicana de Ciencias Geologicas
Volumen26
N.º1
EstadoPublicada - 3 sep 2009

Huella dactilar

migmatization
foliation
Jurassic
magmatism
metamorphism
fold
leucosome
ductile deformation
greenschist
lineation
amphibolite
amphibolite facies
hornblende
geochronology
Paleocene
Oligocene
biotite
terrane
garnet
zircon

Palabras clave

  • Mesozoic
  • Migmatization
  • Southern México
  • U-Pb
  • Xolapa complex

Citar esto

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title = "Evoluci{\'o}n geol{\'o}gica mesozoica del Complejo Xolapa al norte de Acapulco, sur de M{\'e}xico: implicaciones para las reconstrucciones paleogeogr{\'a}ficas",
abstract = "The Xolapa Complex in the Acapulco-Tierra olorada area, southern Mexico, is made up of orthogneisses and paragneisses, both affected by a variable degrees of migmatization. These rocks are intruded by several episodes of Jurassic-Oligocene, calc-alkaline granitic magmatism. Three phases of ductile deformation affected the gneisses and migmatites. D1 produced an amphibolite-facies metamorphic banding (M1) and a penetrative S1 foliation, axial planar to isoclinal, recumbent F1 folds with axes parallel to a NE to NW, gently plunging, L1 stretching lineation. D2 consists of a S2 foliation defined by hornblende, biotite and garnet, synchronous with M2 migmatization that generated leucosomes, which are generally parallel to S1. D3 is made up of asymmetric, chevron F3 folds that deform the composite S1/S2 foliation during greenschist to lower amphibolite metamorphism (M3). U-Pb SHRIMP (Sensitive High-Resolution Ion Micropobe) geochronology carried out on zircon separated from two orthogneisses yielded an Early Jurassic magmatic event (178.7 ± 1.1 Ma) and the age of migmatization (133.6 ± 0.9 Ma). Two episodes of Pb loss were also recognized, the first at 129.2 ± 0.4 Ma, and the second during the earliest Paleocene (61.4 ± 1.5 Ma); they are probably associated with two episodes of magmatism. The Early Jurassic magmatic arc may be correlated with a magmatic arc in the eastern Guerrero terrane. The Early Cretaceous migmatization is inferred to have resulted from shortening, possibly due to the accretion of an exotic block, such as the Chort{\'i}s block along whose northern margin contemporaneous, high-pressure metamorphism has been recorded.",
keywords = "Mesozoic, Migmatization, Southern M{\'e}xico, U-Pb, Xolapa complex",
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Evolución geológica mesozoica del Complejo Xolapa al norte de Acapulco, sur de México : implicaciones para las reconstrucciones paleogeográficas. / Pérez-Gutiérrez, Rosalva; Solari, Luigi Augusto; Gómez-Tuena, Arturo; Martens, Uwe.

En: Revista Mexicana de Ciencias Geologicas, Vol. 26, N.º 1, 03.09.2009, p. 201-221.

Resultado de la investigación: Contribución a una revistaArtículo

TY - JOUR

T1 - Evolución geológica mesozoica del Complejo Xolapa al norte de Acapulco, sur de México

T2 - implicaciones para las reconstrucciones paleogeográficas

AU - Pérez-Gutiérrez, Rosalva

AU - Solari, Luigi Augusto

AU - Gómez-Tuena, Arturo

AU - Martens, Uwe

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N2 - The Xolapa Complex in the Acapulco-Tierra olorada area, southern Mexico, is made up of orthogneisses and paragneisses, both affected by a variable degrees of migmatization. These rocks are intruded by several episodes of Jurassic-Oligocene, calc-alkaline granitic magmatism. Three phases of ductile deformation affected the gneisses and migmatites. D1 produced an amphibolite-facies metamorphic banding (M1) and a penetrative S1 foliation, axial planar to isoclinal, recumbent F1 folds with axes parallel to a NE to NW, gently plunging, L1 stretching lineation. D2 consists of a S2 foliation defined by hornblende, biotite and garnet, synchronous with M2 migmatization that generated leucosomes, which are generally parallel to S1. D3 is made up of asymmetric, chevron F3 folds that deform the composite S1/S2 foliation during greenschist to lower amphibolite metamorphism (M3). U-Pb SHRIMP (Sensitive High-Resolution Ion Micropobe) geochronology carried out on zircon separated from two orthogneisses yielded an Early Jurassic magmatic event (178.7 ± 1.1 Ma) and the age of migmatization (133.6 ± 0.9 Ma). Two episodes of Pb loss were also recognized, the first at 129.2 ± 0.4 Ma, and the second during the earliest Paleocene (61.4 ± 1.5 Ma); they are probably associated with two episodes of magmatism. The Early Jurassic magmatic arc may be correlated with a magmatic arc in the eastern Guerrero terrane. The Early Cretaceous migmatization is inferred to have resulted from shortening, possibly due to the accretion of an exotic block, such as the Chortís block along whose northern margin contemporaneous, high-pressure metamorphism has been recorded.

AB - The Xolapa Complex in the Acapulco-Tierra olorada area, southern Mexico, is made up of orthogneisses and paragneisses, both affected by a variable degrees of migmatization. These rocks are intruded by several episodes of Jurassic-Oligocene, calc-alkaline granitic magmatism. Three phases of ductile deformation affected the gneisses and migmatites. D1 produced an amphibolite-facies metamorphic banding (M1) and a penetrative S1 foliation, axial planar to isoclinal, recumbent F1 folds with axes parallel to a NE to NW, gently plunging, L1 stretching lineation. D2 consists of a S2 foliation defined by hornblende, biotite and garnet, synchronous with M2 migmatization that generated leucosomes, which are generally parallel to S1. D3 is made up of asymmetric, chevron F3 folds that deform the composite S1/S2 foliation during greenschist to lower amphibolite metamorphism (M3). U-Pb SHRIMP (Sensitive High-Resolution Ion Micropobe) geochronology carried out on zircon separated from two orthogneisses yielded an Early Jurassic magmatic event (178.7 ± 1.1 Ma) and the age of migmatization (133.6 ± 0.9 Ma). Two episodes of Pb loss were also recognized, the first at 129.2 ± 0.4 Ma, and the second during the earliest Paleocene (61.4 ± 1.5 Ma); they are probably associated with two episodes of magmatism. The Early Jurassic magmatic arc may be correlated with a magmatic arc in the eastern Guerrero terrane. The Early Cretaceous migmatization is inferred to have resulted from shortening, possibly due to the accretion of an exotic block, such as the Chortís block along whose northern margin contemporaneous, high-pressure metamorphism has been recorded.

KW - Mesozoic

KW - Migmatization

KW - Southern México

KW - U-Pb

KW - Xolapa complex

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