Dating of hydrothermal events in the Sierra del Guadarrama, Iberian Hercynian Belt. Spain.
- Caballero Donoso, José María
- Casquet Martín, César
- Galindo Francisco, Carmen
- González Casado, José Manuel
- Snelling, Norman J.
- Tornos Arroyo, Fernando
ISSN: 0213-683X
Year of publication: 1991
Issue: 11
Pages: 18-22
Type: Article
More publications in: Geogaceta
Abstract
Preliminary results are presented on the age of the hydrothermal activity recorded in the Sierra del Guadarrama. They are among the first data generated by the 1<-Ar Spectrometry Lab. of the CSIS-UCM at Madrid. Hydrothermalites include different types of lodes (W, W-Sn, As, Cu, Pb-Zn, barren quartz, among others), greisens, skarns, episyenites and quartz-chlorite-sericite replacements. Recorded activity spans from ca. 300 to 100M.a. with five well defined «Peaks»: 1) 300290M.a. (greisens and many W lodes), 2) 267 M.a (W-lode related to porphyry dykes), 3) 260220M.a. (Fe-(Ca) skarn and episyenites), 4) 151-156M.a. (quartz-chlorite-sericite replacements, i.e. phyl/ic alteration), and 5) 100M.a. (long barren quartz lodes related to strike-slip faults). This episodic activity is temptatively correlated with important geotectonic events involving the Iberian Peninsula