Eva Chicharro

Universidad Complutense de Madrid

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Carlos Villaseca

Instituto de Geociencias

JÁ

José Ángel López García

The University of Texas at El Paso

Roberto Oyarzun

University of Chile

Enrique Merino

Instituto Geológico y Minero de España

Cecilia Pérez-Soba Aguilar

Universidad Complutense de Madrid

Tomás Martı́n Crespo

Universidad Rey Juan Carlos

ЕБ

Елена Белоусова

Macquarie University

Marie‐Christine Boiron

Université de Lorraine

Ricardo Oyarzún

University of La Serena

V. Sánchez

Repsol (Spain)

Cooperative Institutions

Universidad Complutense de Madrid

Consejo Superior de Investigaciones Científicas

Swedish Museum of Natural History

Instituto de Geociencias

Instituto Geológico y Minero de España

Universidad Rey Juan Carlos

Macquarie University

University of Castilla-La Mancha

University of Concepción

Centre National de la Recherche Scientifique

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Geology and gravity modeling of the Logrosán Sn–(W) ore deposits (Central Iberian Zone, Spain)

Ore Geology Reviews (2014)

Eva Chicharro Tomás Martı́n Crespo David Gómez-Ortíz José Ángel López García Roberto Oyarzun

Pegmatite

Polymetallic replacement deposit

10.1016/j.oregeorev.2014.10.005

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Citations (27)

Origin, ore forming fluid evolution and timing of the Logrosán Sn–(W) ore deposits (Central Iberian Zone, Spain)

Ore Geology Reviews (2015)

Eva Chicharro Marie‐Christine Boiron José Ángel López García Dan N. Barfod Carlos Villaseca

The Logrosán Sn–(W) ore deposits in the metallogenic Sn–W province of the European Variscan Belt consist of endo- and exogranitic greisen-type and quartz–cassiterite veins associated with a S-type granite. Mineral characterization, fluid inclusion study, isotope geochemistry and Ar–Ar geochronology have been combined in order to reconstruct the conditions for Sn–(W) mineralization. The endo- and exogranitic mineralization must have been developed in a relatively long-lived system (~ 308–303 Ma), during or soon after the emplacement of the Logrosán related-granite (at ca. 308 Ma). The mineralizing fluids are characterized by complex aqueous and volatile (H2O–N2–CO2–CH4–NaCl) fluid inclusions. Microthermometry and Raman analyses indicate that fluid composition evolved from N2–CH4 to N2-rich, followed by CO2-rich fluids, with varying amounts of H2O. The presence of N2 and CH4 suggests the interaction with fluids derived from the nearby metasedimentary host rocks. A model of host-rock interaction, assimilation, and mixing of metamorphic and magmatic fluids, resulting in change of the redox conditions, is proposed for tin deposition. Later sulfide minerals were precipitated as a result of pressure and temperature release.

Cassiterite

Greisen

Ore genesis

Sulfide Minerals

10.1016/j.oregeorev.2015.09.020

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Citations (47)

Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone)

Journal of Iberian Geology (2014)

Eva Chicharro Carlos Villaseca Pablo Valverde-Vaquero Елена Белоусова José Ángel López García

The Variscan orogeny produced widespread granites along the European Variscan belt. In relation to crustal thickening, post-collisional multiple tin-bearing highly fractionated S-type leucogranites were emplaced. The Logrosán granite represents one of those granitic bodies and is a focus of this study. The Logrosán granite is located in the Central Extremadura Batholith (CEB), within the Central Iberian Zone (CIZ) and was emplaced during post kinematic stages of the Variscan orogeny at ca. 308 Ma, as determined by combined ID-TIMS U–Pb and LA-ICPMS geochronology. The granitic body intruded the metasedimentary Schist Greywacke Complex (SGC) of Neoproterozoic age. A moderately evolved medium- to coarse-grained two mica leucogranite (Main unit) and some highly evolved aplitic or microporphyritic units (evolved units) are distinguishable on the basis of their petrography and whole rock geochemistry. Initial 87Sr/86Sr ratios vary from 0.7134 to 0.7311, whereas initial εNd shows a restricted range from -4.3 to -4.0 and εHf(t) ranges from +2.0 to -4.6 for Variscan-age zircons. Inherited zircons exhibit mostly Neoproterozoic ages and juvenile Hf-isotope composition (eHf up to +14.6), analogous to that of zircons from the SGC metasediments. The available geological, geochronological, geochemical and isotopic data allow to propose the partial melting of heterogeneous Neoproterozoic metasedimentary material, similar to the outcropping SGC, for the genesis of the Logrosán granite.

Leucogranite

Batholith

Orogeny

Geochronology

10.5209/rev_jige.2014.v40.n3.43928

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Citations (11)

Hydrothermal phosphate vein-type ores from the southern Central Iberian Zone, Spain: Evidence for their relationship to granites and Neoproterozoic metasedimentary rocks

Ore Geology Reviews (2014)

Elena Vindel Eva Chicharro Carlos Villaseca José Ángel López García V. Sánchez

Phosphate minerals

10.1016/j.oregeorev.2014.03.011

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Contrasting chemical and isotopic signatures from Neoproterozoic metasedimentary rocks in the Central Iberian Zone (Spain) of pre-Variscan Europe: Implications for terrane analysis and Early Ordovician magmatic belts

Precambrian Research (2014)

Carlos Villaseca Enrique Merino Ricardo Oyarzún David Orejana Cecilia Pérez-Soba Aguilar

Massif

Anatexis

Basement

10.1016/j.precamres.2014.02.006

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Citations (57)

Caracterización mineral del granito peralumínico de Logrosán (Cáceres, España) Mineral characterization of the peraluminous granite of Logrosán (Cáceres, España)

Eva Chicharro Carlos Villaseca José Ángel López García Roberto Oyarzun

The Logrosan granite (Caceres, SW Spain), shows a complex intragranitic stockwork of Sn-W veins and peripheral phosphate veins hosted by Precambrian slates. The Logrosan pluton emplacement probably took place during the third phase of the Variscan Orogeny. The granite intrusion created an extensive metamorphic aureole which affects the Precambrian slates. The Logrosan stock is classified as a peraluminous, P-rich and F-rich leucogranite, with aplite dikes and tourmaline bearing pegmatites. A greisen alteration was induced during tin-veining in the host granitic rock. The main rock-forming minerals include quartz, K-feldspar, plagioclase, muscovite, biotite and apatite. Samples of granite and greisen veins were analysed and examined by electron microprobe to characterize the chemical nature of the main mineralogy.

Tourmaline

Greisen

Pegmatite

Leucogranite

Cassiterite

SLATES

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