RT Journal Article
T1 Southward migration of continental volcanic activityin the Sierra de Las Cruces, Mexico:palaeomagnetic and radiometric evidence
A1 Osete López, María Luisa
A1 Ruiz Martínez, Vicente Carlos
A1 Caballero Miranda, Cecilia
A1 Galindo Francisco, María Del Carmen
A1 Urrutia Fucugauchi, Jaime
A1 Tarling, Donald H.
AB 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 centralTrans-Mexican Volcanic Belt. The normal and reversed directions show a polarity pattern with a consistent spatialzonation perpendicular to the NNW–SSE trend of the range. The magnetostratigraphy and K–Ar dates indicate thatvolcanic activity in the Sierra de Las Cruces migrated southeastward at a mean rate of 1.6 cm/a, between 3.6 and1.8 Ma, and that the rate of migration may have been higher, up to 4 cm/a, during the Gauss Chron. Normal andreversed directions pass the reversal test at a 95% confidence level. The mean Plio-Quaternary palaeomagneticdirection for Sierra de Las Cruces is D=350.7°, I=30.6° (N=25, k=30.7, α95=5.3°). The declination deviates to thewest of the expected direction, which suggests that small counterclockwise rotations could take place during formationof the Sierra de Las Cruces volcanics.
PB Elsevier Science B.V., Amsterdam
SN 0040-1951
YR 2000
FD 2000
LK https://hdl.handle.net/20.500.14352/56988
UL https://hdl.handle.net/20.500.14352/56988
LA eng
DS Docta Complutense
RD 12 abr 2025