Les mineralisations et leur contexte geologique dans la Sierra de Cartagena (Sud-Est de l'Espagne)

Ovejero, G.; Jacquin, Jérôme; Servajean, G.

doi:10.2113/gssgfbull.s7-xviii.3.619

Cited by 10 publications

(12 citation statements)

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“…Sierra Minera consists of Paleozoic (mostly micaschists) and overthrusted Triassic rocks (metamorphic and sedimentary rocks, mainly carbonate), emplaced during the Alpine orogeny as part of the Betic chain of southern and southeastern Spain (Ovejero et al 1976). Miocene volcanism triggered hydrothermal activity, which resulted in the formation of one of the most important polymetallic mining districts of the SE Iberian Peninsula, known to ancient Mediterranean cultures some 3000 years ago (Manteca and Ovejero 1992).…”

Section: Environmental Settingmentioning

confidence: 99%

Geochemical characterisation of surface waters, topsoils and efflorescences in a historic metal-mining area in Spain

et al. 2015

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Purpose Mining activities generate large amounts of wastes that may contain potentially toxic elements (PTE), which, if released into the environment, may cause air, water and soil pollution long after mining operations have ceased. This paper describes the environmental relevance of efflorescences, topsoils and surface waters from the abandoned mine of Sierra Minera of Cartagena-La Unión, SE Spain. The exposure of the population to arsenic and the associated risk were also assessed. Materials and methods A total of 10 topsoils and surface waters and 11 efflorescences affected at varying degrees by mining activities were studied. The total potentially toxic element content (As, Cd, Cu, Fe, Pb and Zn) was determined in all samples. In addition, the mineralogical composition of solid samples was determined by X-ray diffraction and some efflorescences were also analysed using a scanning electron microscopy-energy dispersive X-ray spectrometer. Finally, an arsenic-intake risk assessment was carried out, both as regards carcinogenic and non-carcinogenic effects and considering the total and the bioaccesible As content. Results and discussionThe study area is heavily polluted as a result of historical mining and processing activities, during which time great amounts of wastes were produced, characterised by a high PTE content, acidic pH and minerals resulting from supergene alteration. The supergene mineralogical assemblages include soluble metal salts, mainly sulphates, iron hydroxysulphates and iron oxyhydroxides, all of which form ochreous precipitates. Topsoil samples showed risk values and hazard quotients higher than the reference levels, particularly for children. In the efflorescences, these values were lower but still unacceptable. Conclusions The efflorescences are of significance for monitoring purposes because they are involved in cycles of retention release of hydrogen ions, sulphate and potentially toxic elements. In addition, in a semi-arid climate, such as the study area, these minerals contribute to our understanding of the response of the system to episodic rainfall events. In general, it was observed that the arsenic in collected samples represent a potential risk for human health through ingestion.

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Section: Environmental Settingmentioning

confidence: 99%

Geochemical characterisation of surface waters, topsoils and efflorescences in a historic metal-mining area in Spain

et al. 2015

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“…The La Unión mining district (inactive at present) (Figs a) (Oen et al, ; Ovejero et al, ; Manteca & Ovejero, ; López‐García et al, ) is one of the most important geological, mining, and historical sites of Spain (early mining might be as old as 3000 years or even older) (UNESCO, ), and is an extraordinary example of the many relationships between the Miocene magmatism, tectonic and metallogenic processes in SE Spain (e.g., Oyarzun et al, ). The La Unión orebodies, which are locally known as “mantos” (we will keep the term “manto” to follow the previous papers on the district, e.g., Oen et al, ) are lensoid shaped, hydrothermal replacement ore deposits hosted by limestones of the Alpujárride Complex (First Manto) and marbles from the Nevado Filábride (Second Manto) complexes (Fig.…”

Section: The Pb–zn Ore Fields Of La Unión and Mazarrónmentioning

confidence: 99%

Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain)

et al. 2017

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From a mineralogical point of view the La Unión ore field (SE Spain) can be regarded as an oddity as some of its hydrothermal, stratabound type deposits display an extremely unusual paragenesis comprising magnetite ± greenalite ± minnesotaite ± siderite and galena ± sphalerite (IOSC -LZS). Recent mineralogical studies have shown that this paragenesis is also present at the neighboring Mazarrón ore field. These ore fields share a similar geologic setting, involving metamorphic and sedimentary rocks (Paleozoic s.l. to Permian) hosting late Miocene high-K calc-alkaline volcanic and subvolcanic rocks. The latter have andesitic to dacitic composition, and triggered hydrothermal activity and ore deposition. This study discusses the detailed mineral chemistry of magnetite samples from Mazarrón and La Unión and provides some hints for the origin of the IOSC -LZS paragenesis. We performed electron microprobe (EPMA) analyses in magnetite samples from La Unión and Mazarrón to determine the contents of minor and trace elements (Zn, Ni, Mn, Cr, V, K, Ca, Ti, Al, Si, Mg). Given that some results fell below the detection limit for the EPMA instrumental conditions we used robust regression on order statistics (robust ROS), with the NADA package in R to deal with these data sets. The Ca + Al + Mn contents in magnetites from San Cristóbal and Emilia are equivalent to the mean contents of those of IOCG, Kiruna, BIF, Cu porphyry, skarn, VMS, hydrothermal and clastic Pb-Zn deposits, but they are low in Ti + V and Ni + Cr. The principal components analysis indicates that Zn, Ni, Cr, V, K, Ca, Ti, and Mg are roughly collinear, therefore correlated, being also independent from Fe. Besides, the function discriminant analysis of data shows that the magnetites from Emilia and San Cristóbal cluster in differentiated groups, thus probably reflecting some differences related to the distance to the magmatic source that triggered the hydrothermal system: proximal in the case of San Cristóbal and distal in Emilia.

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“… Ovejero et al (1976) recognized four superimposed tectonic units, covered by a Miocene distorted layer. They proposed one lithostratigraphic column for each tectonic unit.…”

Section: Geological Settingmentioning

confidence: 99%

“…This region extends over 50 km 2 , that is, half the size of the area occupied by the Sierra Minera. Although most of these materials were reported in detail in the 20 th century- Oén et al (1975) and Ovejero et al (1976) can be considered the first essays in which the litho-structural column is thoroughly discussed-a full knowledge of the geological setting in this area is not yet achieved. The geologic setting and mineralizations in the Sierra Minera were discussed in sections 4.5-4.6.…”

Section: Lithological Typesmentioning

confidence: 99%

“…The Internal Zones comprise three complex nappes of variable metamorphic grade, which are from bottom to top: the Nevado-Filábride (N-F), the Alpujárride (Alp), and the Maláguide complex (MC). Discordantly overlaying the N-F is the Alp complex, which is constituted from bottom to top by San Gines Unit, Portmán Unit and Gorguel Unit (Manteca and Ovejero, 1992;Ovejero et al, 1976).…”

Section: Lithological Typesmentioning

confidence: 99%

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Reología de los Residuos Post-Flotación de Pb-Zn en la Sierra de Cartagena: La Unión (SE España)

Rubio¹,

Alberto²

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Everything started a distant afternoon in 2004, while I was attending a SEM user. Roberto entered the laboratory and another researcher-José Matías-introduced me to him. Roberto told me-in the most persuasive way-that he was looking for someone to perform some simple fieldwotk related to rainwater in the Campo de Cartagena. Since then, he became my supervisor. That simple fieldwork finally lasted 5 long years. Not only rainwater, but also surface runoff, springwater, seawater, efflorescences, mine wastes, and lithotypes were added to the study. Sampling labours totalized 126 field trips, covering a distance of at least 9784 km with my tough and hard-wearing vehicle. I am grateful to Roberto, for his enthusiastic spirit in guiding me across the research jungles in which I entered, unwary and ignorant; Cristóbal García, for being my constant compass in the knowledge of the Sierra Minera; José Ángel Rodríguez, for his geological wisdom; José

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Les mineralisations et leur contexte geologique dans la Sierra de Cartagena (Sud-Est de l'Espagne)

Cited by 10 publications

References 0 publications

Geochemical characterisation of surface waters, topsoils and efflorescences in a historic metal-mining area in Spain

Geochemical characterisation of surface waters, topsoils and efflorescences in a historic metal-mining area in Spain

Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain)

Reología de los Residuos Post-Flotación de Pb-Zn en la Sierra de Cartagena: La Unión (SE España)

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