Pardo Alonso, M. V.López Buendía, A. M.Serrano, J.Bastida, J.2010-01-222010-01-221995Cadernos do Laboratorio Xeolóxico de Laxe, 1995, 20: 117-122 ISSN: 0213-44970213-4497http://hdl.handle.net/2183/6200[Abstract] Amacroscopic pyrophyllite bearing mineralization related to shells ofspiriferids has beeen found in the Herrera Formation (southern Central-Iberian Zone, Hesperic Massif, Spain). The observed mineral asociation is pyrophyllite + nacrite + quartz + calcite + anhydrite, and it is interpreted as resulting from the substitution ofinitial carbonatic shell by a Si, Al, S rich hydrothermal solutionspaPyrophilliteFossil diagenesisHydrothermalBrachiopdsDevonianHesperian MassifSpainjournal articleopen access