2026-06-29T07:41:51Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/1197502025-04-29T23:48:55Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Higueras, Pablo
author
Munhá, José
author
Oyarzun Muñoz, Roberto
author
Tassinari, Colombo C. G.
author
Ruiz, Izabel R.
2025-04-29T14:19:59Z
2025-04-29T14:19:59Z
2005-05-24
Higueras, P., Munhá, J., Oyarzun, R., Tassinari, C. C. G., & Ruiz, I. R. (2005). First lead isotopic data for cinnabar in the Almadén district (Spain): Implications for the genesis of the mercury deposits. Mineralium Deposita, 40(1), 115-122. https://doi.org/10.1007/s00126-005-0471-2
10.1007/s00126-005-0471-2
https://hdl.handle.net/20.500.14352/119750
https://doi.org/10.1007/s00126-005-0471-2
https://link.springer.com/journal/126
The Almadén district constitutes the largest and probably the most intriguing mercury concentration in the world. Two types of mineralization are recognized: 1) stratabound, of Lower Silurian age, well represented by the large Almadén deposit; and 2) fully discordant mercury deposits of minor importance in terms of size, and exemplified by the deposit of Las Cuevas. The latter ones can be found at different positions along the Almadén stratigraphic column. Both types of deposits are always associated with the so-called frailesca rocks (diatremes of alkali basaltic composition). This paper reports the first lead isotope compositions of cinnabar in the district. Whole samples and stepwise leaching cinnabar aliquots display relatively homogeneous isotopic compositions (206Pb/204Pb = 18.112–18.460; 207Pb/204Pb = 15.635–15.705; 208Pb/204Pb = 38.531–38.826). Taken together with Jébrak et al.’s (2002) pyrite lead isotope results, the new cinnabar isotopic data define a steep array trend on the 207Pb/204Pb– 206Pb/204Pb diagram, indicating a mixed contribution of lead and probably mercury from different sedimentary sources in the Almadén basin. The Almadén Hg deposits are related to a contemporaneous mafic magmatism that might have provided part of the mercury. Hydrothermal leaching of organic matter from sedimentary rocks and formation of Hg organic complexes enhanced metal solubility, promoting transport from and within the volcanic units.
eng
First lead isotopic data for cinnabar in the Almadén district (Spain): implications for the genesis of the mercury deposits
journal article
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