Structure and kinematic history of the Acatlán Complex in the Nuevos Horizontes - San Bernardo region, Puebla
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
1997
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| _version_ | 1876463058092556288 |
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| author | Bodo Weber |
| author_facet | Bodo Weber |
| contents | Structure and kinematic history of the Acatlán Complex in the Nuevos Horizontes - San Bernardo region, Puebla Bodo Weber Martin Meschede Lothar Ratschbacher Wolfgang Frisch Ciencias de la Tierra tectonics Acatlán Complex southern Mexico Structural geology deformation analysis Paleozoic metamorphites and magmatites forming the basement of the northern Mixteca terrane in southernMexico define the Acatlán Complex. Six stages of deformation are defined by metamorphic facies, structuralbehaviour, and overprinting relationships. The first deformation (D1) is accompanied by high temperaturemetamorphism (M1), which overprints pre-existing eclogites (D0), and culminates in intrusions of granites.During this deformation, large crystals of mica and megablasts of potassic feldspar grew. The seconddeformation (D2) is indicated by diaphtoresis up to greenschist facies. Mica crystals of the M1 are preserved asrelictic porphyroclasts in the S1 foliation planes. On D2 planes they were broken and substituted by sericite. D2caused elongation and recrystallization of quartz. During the third deformation (D3) the Acatln Complex was folded into W-vergent, tight to isoclinal folds. Sediments deposited between D2 and D3 were metamorphosed byvery low grade metamorphism during D3. As the granites intruded into an upper crustal level, they show S3foliation. The fourth deformation phase is characterized by kinkfolds, cataclastic shearzones, and faults withslickensides. Calculations of the paleostress tensors yielded subhorizontal s1- and s3-axis indicating NE-SWorientation of s1. Most of the fault populations belong to the fifth deformation (D5) with subhorizontal s1- ands3-axis with ESE-WNW s1 direction. Normal faults define the sixth deformation (D6) with subvertical s1-axisand N-S trending s3-axes. 1997 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56836201 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.36 |
| format | Artículo científico |
| id | redalyc_56836201 |
| institution | Redalyc |
| language | en |
| publishDate | 1997 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Structure and kinematic history of the Acatlán Complex in the Nuevos Horizontes - San Bernardo region, Puebla Bodo Weber Ciencias de la Tierra tectonics Acatlán Complex southern Mexico Structural geology deformation analysis Structure and kinematic history of the Acatlán Complex in the Nuevos Horizontes - San Bernardo region, Puebla Bodo Weber Martin Meschede Lothar Ratschbacher Wolfgang Frisch Ciencias de la Tierra tectonics Acatlán Complex southern Mexico Structural geology deformation analysis Paleozoic metamorphites and magmatites forming the basement of the northern Mixteca terrane in southernMexico define the Acatlán Complex. Six stages of deformation are defined by metamorphic facies, structuralbehaviour, and overprinting relationships. The first deformation (D1) is accompanied by high temperaturemetamorphism (M1), which overprints pre-existing eclogites (D0), and culminates in intrusions of granites.During this deformation, large crystals of mica and megablasts of potassic feldspar grew. The seconddeformation (D2) is indicated by diaphtoresis up to greenschist facies. Mica crystals of the M1 are preserved asrelictic porphyroclasts in the S1 foliation planes. On D2 planes they were broken and substituted by sericite. D2caused elongation and recrystallization of quartz. During the third deformation (D3) the Acatln Complex was folded into W-vergent, tight to isoclinal folds. Sediments deposited between D2 and D3 were metamorphosed byvery low grade metamorphism during D3. As the granites intruded into an upper crustal level, they show S3foliation. The fourth deformation phase is characterized by kinkfolds, cataclastic shearzones, and faults withslickensides. Calculations of the paleostress tensors yielded subhorizontal s1- and s3-axis indicating NE-SWorientation of s1. Most of the fault populations belong to the fifth deformation (D5) with subhorizontal s1- ands3-axis with ESE-WNW s1 direction. Normal faults define the sixth deformation (D6) with subvertical s1-axisand N-S trending s3-axes. 1997 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56836201 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.36 |
| title | Structure and kinematic history of the Acatlán Complex in the Nuevos Horizontes - San Bernardo region, Puebla |
| topic | Ciencias de la Tierra tectonics Acatlán Complex southern Mexico Structural geology deformation analysis |
| url | https://www.redalyc.org/articulo.oa?id=56836201 |