| Título: | Southward migration of continental volcanic activityin the Sierra de Las Cruces, Mexico:palaeomagnetic and radiometric evidence |
| Autores: | Osete López, María Luisa ; Ruíz Martínez, Vicente Carlos ; Caballero Miranda, Cecilia ; Galindo Francisco, Mª del Carmen ; Urrutia Fucugauchi, Jaime ; Tarling, Donald H. |
| Tipo de documento: | texto impreso |
| Editorial: | Elsevier Science B.V., Amsterdam, 2000 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Geoquímica , Materia = Ciencias: Geología: Geodinámica , Tipo = Artículo |
| Resumen: |
New Palaeomagnetic data for 30 sites (271 samples) and K–Ar data from five units in the Sierra de Las Cruces, western Basin of Mexico, provide constraints on the spatial-temporal evolution of arc magmatism in the central Trans-Mexican Volcanic Belt. The normal and reversed directions show a polarity pattern with a consistent spatial zonation perpendicular to the NNW–SSE trend of the range. The magnetostratigraphy and K–Ar dates indicate that volcanic activity in the Sierra de Las Cruces migrated southeastward at a mean rate of 1.6 cm/a, between 3.6 and 1.8 Ma, and that the rate of migration may have been higher, up to 4 cm/a, during the Gauss Chron. Normal and reversed directions pass the reversal test at a 95% confidence level. The mean Plio-Quaternary palaeomagnetic direction for Sierra de Las Cruces is D=350.7°, I=30.6° (N=25, k=30.7, ?95=5.3°). The declination deviates to the west of the expected direction, which suggests that small counterclockwise rotations could take place during formation of the Sierra de Las Cruces volcanics. |
| En línea: | https://eprints.ucm.es/id/eprint/12041/1/Osete_et_al_tect_1_2000.pdf |
Ejemplares
| Estado |
|---|
| ningún ejemplar |
