Lorena Ortega Menor

Universidad Complutense de Madrid

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Rosario Lunar Hernández

Instituto de Geociencias

Rubén Piña

Universidad Complutense de Madrid

Fernando Gervilla

Universidad de Granada

José F. Barrenechea

Universidad Complutense de Madrid

Rubén Piña García

Instituto Volcanológico de Canarias

Francisco Javier Luque del Villar

Universidad Complutense de Madrid

Serafín Monterrubio Pérez

Universidad de Salamanca

Sarah‐Jane Barnes

Université du Québec à Chicoutimi

D. Millward

British Geological Survey

Roberto Oyarzun

University of Chile

Cooperative Institutions

Universidad Complutense de Madrid

Consejo Superior de Investigaciones Científicas

Universidad de Granada

Instituto de Geociencias

Instituto Geológico y Minero de España

Universitat Autònoma de Barcelona

University of Castilla-La Mancha

Mineral Resources

Instituto Andaluz de Ciencias de la Tierra

Universidad de Salamanca

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfide deposit, SW Iberia: A multidisciplinary approach

Geological Society of America Bulletin (2010)

Rubén Piña I. Romeo Lorena Ortega Menor Rosario Lunar Hernández Ramón Capote

Research Article| May 01, 2010 Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfide deposit, SW Iberia: A multidisciplinary approach Rubén Piña; Rubén Piña † 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain †E-mail: rpinagar@geo.ucm.es Search for other works by this author on: GSW Google Scholar Ignacio Romeo; Ignacio Romeo 2Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Lorena Ortega; Lorena Ortega 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Rosario Lunar; Rosario Lunar 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Ramón Capote; Ramón Capote 2Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Fernando Gervilla; Fernando Gervilla 3Departamento de Mineralogía y Petrología, Facultad de Ciencias, Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada–Consejo Superior de Investigaciones Científicas (CSIC), 18071 Granada, Spain Search for other works by this author on: GSW Google Scholar Rosa Tejero; Rosa Tejero 2Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Cecilio Quesada Cecilio Quesada 4Instituto Geológico y Minero de España, Ríos Rosas 23, 28003 Madrid, Spain Search for other works by this author on: GSW Google Scholar GSA Bulletin (2010) 122 (5-6): 915–925. https://doi.org/10.1130/B30046.1 Article history received: 03 Mar 2009 rev-recd: 29 Jun 2009 accepted: 06 Jul 2009 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Rubén Piña, Ignacio Romeo, Lorena Ortega, Rosario Lunar, Ramón Capote, Fernando Gervilla, Rosa Tejero, Cecilio Quesada; Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfide deposit, SW Iberia: A multidisciplinary approach. GSA Bulletin 2010;; 122 (5-6): 915–925. doi: https://doi.org/10.1130/B30046.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract A model is proposed for the origin and emplacement of the ca. 341 Ma Aguablanca magmatic Ni-Cu-(platinum group element [PGE]) sulfide deposit (SW Iberia) integrating petrological, geochemical, structural, and geophysical data. The Aguablanca deposit occurs in an unusual geodynamic context for this ore type (an active plate margin) as an exotic , magmatic subvertical breccia located at the northern part of the coeval gabbronorite Aguablanca stock (341 ± 1.5 Ma). Structural and gravity data show that mineralized breccia occurs inside the inferred feeder zone for the stock adjacent to the Cherneca ductile shear zone, a Variscan sinistral transpressional structure. The orientation of the feeder zone corresponds to that expected for tensional fractures formed within the strain field of the adjacent Cherneca ductile shear. Two distinctive stages are established for the origin and emplacement of the deposit: (1) initially, the ore-forming processes are attributed to magma emplacement in the crust, assimilation of crustal S, and segregation and gravitational settling of sulfide melt (a scenario similar to most plutonic Ni-Cu sulfide ores), and (2) final emplacement of the Ni-Cu sulfide-bearing rocks by multiple melt injections controlled by successive opening events of tensional fractures related to the Cherneca ductile shear zone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.1130/b30046.1

Cite

Citations (51)

Petrology and Geochemistry of Mafic-Ultramafic Fragments from the Aguablanca Ni-Cu Ore Breccia, Southwest Spain

Economic Geology (2006)

Rubén Piña Rosario Lunar Hernández Lorena Ortega Menor Fernando Gervilla T. T. Alapieti

Aguablanca (southwest Spain) is the first economic Ni-Cu-(PGE) deposit found in southern Europe.Two features make it an unusual example of magmatic sulfide ore: it is related to the development of an Andean-type continental magmatic arc, and it is hosted by a subvertical magmatic breccia.The structural style and the geodynamic context of the deposit contrast with most plutonic Ni-Cu-PGE deposits elsewhere, which occur at specific levels of layered mafic intrusions in rift environments.The Ni-Cu deposit is hosted by the Aguablanca intrusion, a mafic body composed of gabbronorite and minor quartz-diorite, gabbro, and norite.Sulfides are concentrated in a gabbronorite matrix along a subvertical (dip of 70º-80º N), funnel-like magmatic breccia that contains barren or slightly mineralized ultramafic-mafic cu-mulate fragments.Modal compositions of the fragments reflect a wide variety of rock types, including peri-dotite (hornblende-rich werhlite, dunite, and hornblende-rich harzburgite), pyroxenite (ortho-and clinopyrox-enite), gabbro (gabbro, gabbronorite, and hornblende gabbro), and anorthosite.The primary silicate assemblage includes olivine (Fo91-Fo79), orthopyroxene (Mg no.0.85-0.73),clinopyroxene (Mg no.0.93-0.62),plagioclase (An99-An38), amphibole (Mg no.0.87-0.68)and phlogopite (Mg no.0.89-0.64).The wide range of rock types and the Fe-enrichment trends in the primary ferromagnesian silicates suggest magmatic differenti-ation processes from the parent melts, with the fragments representing different stages of cumulate formation.The ore-bearing breccia contains both semimassive and disseminated sulfides in the gabbronorite matrix.Textures vary between meso-and orthocumulate, and the rock-forming magmatic silicates are orthopyroxene (Mg no.0.83-0.74),clinopyroxene (Mg no.0.89-0.78),plagioclase (An50-An77), and intercumulus amphibole (Mg no.0.86-0.70),phlogopite (0.84-0.69) and minor quartz.The gabbronorite in the matrix of the breccia is petrographically and chemically very similar to that of the unmineralized parts of the main Aguablanca intru-sion and exhibits a similar differentiation trend, suggesting that the matrix of the ore-bearing breccia and the unmineralized rocks belong to a same magmatic suite.The local presence of mafic-ultramafic fragments in the barren Aguablanca intrusion supports this suggestion.The presence of highly Ni depleted olivine, whole-rock Cu/Zr ratios below 1, and the local occurrence of dis-seminations of magmatic sulfides in the peridotite fragments point to sulfide segregation before and/or during the formation of the peridotite cumulates.Mantlenormalized incompatible trace element patterns of the frag-ments along with published sulfur isotope data are consistent with crustal contamination, suggesting that addi-tion of crustal sulfur from pyrite-bearing black slates led to sulfide saturation.These results support a model in which sulfides segregated and settled during the differentiation of an unexposed mafic-ultramafic complex, now sampled as fragments in the breccia, whereas the overlying silicate magma, most probably fed by succes-sive fresh magma injections, underwent fractional crystallization, giving rise to this cumulate sequence.The emplacement of the ore breccia took place at temperatures above the (monosulfide solid solution (mss) solidus but below the olivine and pyroxene solidus, likely owing to the explosive injection of a new pulse of magma into the chamber, which mingled with the sulfide liquid and disrupted the overlying cumulate sequence.As a consequence, fragments reached their current position in the breccia, injected along with the sulfide and the sili-cate melts, which subsequently formed the sulfide-rich gabbronorite.

Ultramafic rock

Breccia

10.2113/gsecongeo.101.4.865

Cite

Citations (58)

Geochemical Constraints on the Origin of the Ni–Cu Sulfide Ores in the Tejadillas Prospect (Cortegana Igneous Complex, SW Spain)

Resource Geology (2012)

Rubén Piña Fernando Gervilla Lorena Ortega Menor Rosario Lunar Hernández

Abstract After the discovery of the Aguablanca ore deposit (the unique Ni–Cu mine operating in SW Europe), a number of mafic‐ultramafic intrusions bearing Ni–Cu magmatic sulfides have been found in the Ossa–Morena Zone of the Iberian Massif (SW Iberian Peninsula). The Tejadillas prospect is one of these intrusions, situated close to the border between the Ossa–Morena Zone and the South Portuguese Zone of the Iberian Massif. This prospect contains an average grade of 0.16 wt % Ni and 0.08 wt % Cu with peaks of 1.2 wt % Ni and 0.2 wt % Cu. It forms part of the Cortegana Igneous Complex, a group of small mafic‐ultramafic igneous bodies located 65 km west of the Aguablanca deposit. In spite of good initial results, exploration work has revealed that sulfide mineralization is much less abundant than in Aguablanca. A comparative study using whole‐rock geochemical data between Aguablanca and Tejadillas shows that the Tejadillas igneous rocks present a lower degree of crustal contamination than those of Aguablanca. The low crustal contamination of the Tejadillas magmas inhibited the assimilation of significant amounts of crustal sulfur to the silicate magmas, resulting in the sparse formation of sulfides. In addition, Tejadillas sulfides are strongly depleted in PGE, with total PGE contents ranging from 14 to 81 ppb, the sum of Pd and Pt, since Os, Ir, Ru and Rh are usually below or close to the detection limit (2 ppb). High Cu/Pd ratios (9700–146,000) and depleted mantle‐normalized PGE patterns suggest that the Tejadillas sulfides formed from PGE‐depleted silicate magmas. Modeling has led us to establish that these sulfides segregated under R‐factors between 1000 and 10,000 from a silicate melt that previously experienced 0.015% of sulfide extraction. All these results highlight the importance of contamination processes with S‐rich crustal rocks and multiple episodes of sulfide segregations in the genesis of high‐tenor Ni–Cu–PGE ore deposits in mafic‐ultramafic intrusions of the region.

Ultramafic rock

Massif

10.1111/j.1751-3928.2012.00194.x

Cite

Citations (4)

El origen del azufre en mineralizaciones filonianas en el centrode la Península Ibérica

Geogaceta (1995)

F. Javier Lillo Ramos Roberto Oyarzun Lorena Ortega Menor

Sufphur isotope data from severa/ base metals-Ba-(F)-(Ag) and Ag-base metals vein-type deposits in the Central Jberian Zone of the Hesperian Massif suggest a magmatic and/or metasedimentary origin of this ore-forming component. Deposits exclusive/y hosted in metasediments (p.e. Alcudia Va/ley, type IV) display a magmatic signature. Even those /odes and stratabound deposits hosted by Permian-Triassic terrigenous and andesites (Las Torrecillas-Linares y Atienza) are formed by igneous sulphur.

Massif

Andesites

Source

Cite

Citations (1)

Mineralogy and geochemistry of platinum-group elements in the Aguablanca Ni-Cu deposit (SW Spain)

Mineralogy and Petrology (2007)

Rubén Piña F. Gervilla Lorena Ortega Menor Rosario Lunar Hernández

Pentlandite

Platinum group

Supergene (geology)

10.1007/s00710-007-0195-3

Cite

Citations (47)

Composición de las cromoespinelas ofiolíticas de Calzadilla de los Barros (Badajoz): implicaciones petrogenéticas

Macla: revista de la Sociedad Española de Mineralogía (2010)

Rubén Martos Lorena Ortega Menor Fernando Gervilla Serafín Monterrubio Pérez Rubén Piña García

de los nucleos inalterados de -espinelaCr s (Arai, 1992) permiten estimar que las -espinelas Crestudiadas se habrian formado a partir de un magma parental de tipo MORB. Los procesos de alteracion y/o metamorfismo posteriores habrian modificado la composicion original de los bordes y de algunos nucleos de granos de Cr-espinela. Las espinelas accesorias y las de las cromititas muestran una tendencia comun de alteracion, con un aumento de Fe

Source

Cite

Citations (0)

Contrasting Mineralizing Processes in Volcanic-HostedGraphite Deposits

Francisco Javier Luque del Villar José F. Barrenechea Lorena Ortega Menor M. Rodas D. Millward

The only two known graphite vein-deposits hosted by volcanic rocks (Borrowdale, United Kingdom, and Huelma, Southern Spain) show remarkable similarities and differences. The lithology, age of the magmatism and geodynamic contexts are distinct, but the mineralized bodies are controlled by fractures. Evidence of assimilation of metasedimentary rocks by the magmas and hydrothermal alteration are also common features to both occurrences. Graphite morphologies at the Borrowdale deposit vary from flakes (predominant) to spherulites and cryptocrystalline aggregates, whereas at Huelma, flaky graphite is the only morphology observed. The structural characterization of graphite indicates a high degree of ordering along both the c axis and the basal plane. Stable carbon isotope ratios of graphite point to a biogenic origin of carbon, most probably related to the assimilation of metasedimentary rocks. Bulk į13C values are quite homogeneous in both occurrences, probably related to precipitation in short time periods. Fluid inclusion data reveal that graphite precipitated from C-O-H fluids at moderate temperature (500 oC) in Borrowdale and crystallized at high temperature from magma in Huelma, In addition, graphite mineralization occurred under contrasting fO2 conditions. All these features can be used as potential exploration tools for volcanic-hosted graphite deposits.

Source

Cite

Citations (2)

The manto-type gold deposits of Andacollo (Chile) revisited; a model based on fluid inclusion and geologic evidence

Economic Geology (1996)

Roberto Oyarzun Lorena Ortega Menor J. Sierra Rosario Lunar Hernández

10.2113/gsecongeo.91.7.1298

Cite

Citations (15)

C-O-H-N fluid inclusions associated with gold-stibnite mineralization in low-grade metamorphic rocks, Mari Rosa mine, Caceres, Spain

Mineralogical Magazine (1991)

Lorena Ortega Menor Elena Vindel C. Bény

Abstract The Mari Rosa mine lies within a low-grade Precambrian alternating series of black shales and metagreywackes in the Spanish Hercynian massif. There are two generations of mineralized veins: V2, gold-(stibnite)-bearing quartz veins, parallel to the main cleavage, and V3, stibnite-bearing quartz veins which postdate the main deformation event. Four main types of inclusions have been identified. Type I, II and IV are aqueous-carbonaceous inclusions, with variable degrees of filling, while type III are non-aqueous and typically single-phase at room temperature. Except for type I (absent in V3), similar inclusions have been observed in both V2 and V3 veins. Gas compositions are always characterised by CH 4 -N 2 -CO 2 assemblages, ranging from CO 2 -rich mixtures in the earliest inclusions (type I), to N 2 -rich mixtures in the latest inclusions (type IV). Gold precipitation in V2 veins can be related to type I inclusions at T > 380°C ( T H = 300–380°C). A subsequent drop in X CO 2 and cooling are recorded in type II and III inclusions, interpreted to be the result of unmixing of a previously homogeneous fluid derived from type I. This boiling would provoke the precipitation of stibnite at 300°C and 1 kbar. The type IV inclusions, which are the richest in H 2 O, represent a late fluid circulation at lower temperatures ( T H = 190–280°C).

Stibnite

10.1180/minmag.1991.055.379.12

Cite

Citations (19)

U–Pb age constraints on Variscan magmatism and Ni–Cu–PGE metallogeny in the Ossa–Morena Zone (SW Iberia)

Journal of the Geological Society (2006)

I. Romeo Rosario Lunar Hernández Ramón Capote C. Quesada Greg Dunning

New U–Pb zircon ages from the Santa Olalla Igneous Complex have been obtained, which improve the knowledge of the precise timing of Variscan magmatism in the Ossa–Morena Zone, SW Iberia. This complex has a special relevance as it hosts the most important Ni–Cu–platinum group element (PGE) mineralization in Europe: the Aguablanca deposit. U–Pb zircon ages have been obtained for seven samples belonging to the Santa Olalla Igneous Complex and spatially related granites. With the exception of the Cala granite (352 ± 4 Ma), which represents an older intrusion, the bulk of samples yield ages that cluster around 340 ± 3 Ma: the Santa Olalla tonalite (341.5 ± 3 Ma), the Sultana hornblende tonalite (341 ± 3 Ma), a mingling area at the contact between the Aguablanca and Santa Olalla stocks (341 ± 1.5 Ma), the Garrote granite (339 ± 3 Ma), the Teuler granite (338 ± 2 Ma), and dioritic dykes from the Aguablanca stock (338.6 ± 0.8 Ma). The Bodonal–Cala porphyry, which has also been dated (530 ± 3 Ma), comprises a group of sub-volcanic rhyolitic intrusions belonging to the Bodonal–Cala volcano-sedimentary complex, which hosts the igneous rocks. The knowledge that emplacement of the Aguablanca deposit was related to episodic transtensional tectonic stages during the Variscan orogeny will be fundamental in future mineral exploration in the Ossa–Morena Zone.

Metallogeny

10.1144/0016-76492005-065

Cite

Citations (66)