Rafael Del Río-Salas

Abstract Dispersion of potentially toxic elements associated with efflorescent crusts and mine tailings materials from historical mine sites threaten the environment and human health. Limited research has been done on traceability from historical mining sites in arid and semi-arid regions. Pb isotope systematics was applied to decipher the importance of identifying the mixing of lead sources involved in forming efflorescent salts and the repercussions on traceability. This research assessed mine waste (sulfide-rich and oxide-rich tailings material and efflorescent salts) and street dust from surrounding settlements at a historical mining site in northwestern Mexico, focusing on Pb isotope composition. The isotope data of tailings materials defined a trending line (R 2 = 0.9); the sulfide-rich tailings materials and respective efflorescent salts yielded less radiogenic Pb composition, whereas the oxide-rich tailings and respective efflorescent salts yielded relatively more radiogenic compositions, similar to the geogenic component. The isotope composition of street dust suggests the dispersion of tailings materials into the surroundings. This investigation found that the variability of Pb isotope composition in tailings materials because of the geochemical heterogeneity, ranging from less radiogenic to more radiogenic, can add complexity during environmental assessments because the composition of oxidized materials and efflorescent salts can mask the geogenic component, potentially underestimating the influence on the environmental media.

Radiogenic nuclide

10.1007/s10653-024-02180-3

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Fault–associated Dolomites in the Benicàssim Area, Maestrat Basin, E. Spain – Macro– to Micro–scale Fluid Flow in Carbon

72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010 (2010)

Juan Diego Martín‐Martín Anna Travé Enrique Gomez‐Rivas Jean‐Pierre Sizun Rafael Del Río-Salas

Partial dolomitization of the middle to late Aptian carbonate succession from the SE Maestrat Basin (E. Spain) occurred during shallow burial in relation to the circulation of high temperature fluids (>60º C) through regional extensional faults and most permeable host limestone facies. The timing of replacement is constrained between the early Albian (syn-rift) and the Campanian (post-rift). Analytical data suggest that most likely dolomitizing fluid is evolved Aptian/Albian seawater, probably mixed with basinal waters. The resulting replacive dolomite texture has very low porosity, mainly of vuggy type, that was successively enhanced by dissolution and occluded by burial dolomite and calcite cementation during Late Cretaceous. Dolomite hosted Mississipi Valley-type ore deposits, and associated saddle dolomite, formed due to hydrothermal alteration through large-scale faults during the onset of the Tertiary. Later Alpine uplift and fracturing promote meteoric calcite cementation and dedolomitization through fractures and fault zones. Porosity and permeability data evidence a very bad potential reservoir quality of the host limestone, being only slightly higher in the dolomites due to the reported pervasive burial calcite cementation. Results provide a new case study of partial dolomitization that can be used in the characterization of equivalent hydrocarbon reservoirs worldwide.

Dolomitization

Cementation (geology)

Aptian

10.3997/2214-4609.201400942

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Citations (7)

Metals in residential soils and cumulative risk assessment in Yaqui and Mayo agricultural valleys, northern Mexico

The Science of The Total Environment (2012)

María Mercedes Meza‐Montenegro A. Jay Gandolfi María Ernestina Santana-Alcántar Walter T. Klimecki María Guadalupe Aguilar-Apodaca

Soil test

10.1016/j.scitotenv.2012.06.083

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