RT journal article
T1 Exhumation of the Sierra de Cameros (Iberian Range, Spain): constraints from low-temperature thermochronology
A1 Stuart, F.
A1 Del Río, Pedro
A1 Barbero González, Luis Carlos
A2 Ciencias de la Tierra
K1 fission-track
K1 (U-Th)/He dating
AB We present new fission-track and (U–Th)/He data from apatite and zircon in order toreconstruct the exhumation of the Sierra de Cameros, in the northwestern part of Iberian Range,Spain. Zircon fission-track ages from samples from the depocentre of the basin were resetduring the metamorphic peak at approximately 100 Ma. Detrital apatites from the uppermost sedimentsretain fission-track age information that is older than the sediment deposition age, indicatingthat these rocks have not exceeded 110 8C. Apatites from deeper in the stratigraphic sequence ofthe central part of the basin have fission-track ages of around 40 Ma, significantly younger thanthe stratigraphic age, recording the time of cooling after peak metamorphic conditions. Apatite(U–Th)/He ages in samples from these sediments are 31–40 Ma and record the last period ofcooling during Alpine compression. The modelled thermal history derived from the uppermostsediments indicates that the thermal pulse associated with peak metamorphism was rapid, andthat the region has cooled continuously to the present. The estimated palaeogeothermal gradientis around 86 8C km21 and supports a tectonic model with a thick sedimentary fill (c. 8 km) andexplains the origin of the low-grade metamorphism observed in the oldest sediments.
YR 2008
FD 2008-11-01T00:00:00Z
LK http://hdl.handle.net/10498/7442
UL http://hdl.handle.net/10498/7442
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026