2026-06-25T16:33:16Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1183172025-03-18T12:47:37Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Alonso-Azcárate, J. author Rodas González, Magdalena author Bottrell, S.H. author Raiswell, R. author Velasco, F. author Mas Mayoral, José Ramón 2025-02-26T08:13:20Z 2025-02-26T08:13:20Z 1999-07 Alonso‐Azcárate, Rodas, Bottrell, Raiswell, Velasco, & Mas. (1999). Pathways and distances of fluid flow during low‐grade metamorphism: Evidence from pyrite deposits of the Cameros Basin, Spain. Journal of Metamorphic Geology, 17(4), 339-348. https://doi.org/10.1046/j.1525-1314.1999.00202.x 0263-4929 10.1046/J.1525-1314.1999.00202.X https://hdl.handle.net/20.500.14352/118317 1525-1314 https://doi.org/10.1046/j.1525-1314.1999.00202.x https://onlinelibrary.wiley.com/doi/10.1046/j.1525-1314.1999.00202.x New geochemical and sulphur isotopic data are presented for a number of pyrite deposits from the Late Jurassic–Early Cretaceous Cameros Basin, Spain. The deposits were formed at, or close to, the peak of metamorphism and are always related to sandstone units in the mainly metapelite sequence. Iron remained immobile and conservative, pyrite iron being derived by sulphidation of chlorite in the host metapelites. Reduced sulphur, however, was supplied from two external sources: thermochemical reduction of sulphate and release of S during metamorphism of sedimentary sulphides. These sources provided isotopically heavy and light S, respectively, with variation in pyrite isotopic composition between different deposits resulting from differences in their relative importance at each site. During metamorphism, the sandstone units acted as aquifers, carrying the sulphidic pore waters to locations where permeability provided by syn-depositional fractures on a scale of 0.5–5 m allowed its interaction with the metapelites. Transport distances for sulphide during metamorphism were of the order of hundreds of metres. eng Pathways and distances of fluid flow during low-grade metamorphism: evidence from pyrite deposits of the Cameros Basin, Spain journal article 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