RT Journal Article
T1 El metamorfismo en la Cuenca de los Cameros.Geocronología e implicaciones tectónicas
A1 Casquet Martín, César
A1 Galindo Francisco, María Del Carmen
A1 González Casado, José Manuel
A1 Alonso Millán, Ángela
AB A case of hydrothermal metamorphism is described from the Cameros Basin along the rio Cidacostransect. The highest grade is reached at the base of the Urbión Group, a fluvial sequence UpperJurassic to Lower Cretaceous in age (Weald facies). Physical conditions at the thermal peak areestimated at abo 1 Kb (PL) and 326± 13°C (i.e. very low grade metamorphism). Fluids were largelywater brines with minor amounts of gases, CO2 and CH4• f02 and f52 were close to the graphiteand Po-Py buffers respectively. This metamorphism is spatially associated with a deformation band(5-6 km. ín wídth) wíth schístosíty ín the pelitíc beds and promínent tensíonal, quartz ínfílled veínsin the more samítíc ones. K-Ar dating on authígeníc illites has gíven ages from 108 to 86 M.a., i.e.Míddle Cretaceous, and thus younger than the basín fílling (Urbíón Group+Enciso F.+Olívan F.).Metamorphism migth be related wíth the circulatíon of hot mígratory fluíds (i.e. tectoníc brínes),along the deformation bando The tectonic sígníficance of this deformation band is slill uncertain.
PB Sociedad Geológica de España
SN 0213-683X
YR 1992
FD 1992
LK https://hdl.handle.net/20.500.14352/56924
UL https://hdl.handle.net/20.500.14352/56924
LA spa
DS Docta Complutense
RD 6 abr 2025