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

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Chicharro, Eva and Boiron, Marie-Christine and López-García, José Ángel and Barfod, Dan N. and Villaseca González, Carlos (2016) Origin, ore forming fluid evolution and timing of the Logrosán Sn–(W) ore deposits (Central Iberian Zone, Spain). Ore Geology Reviews, 72, A . pp. 896-913. ISSN ISSN: 0169-1368 ; ESSN: 1872-7360

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Official URL: https://www.sciencedirect.com/journal/ore-geology-reviews/vol/72/part/P1




Abstract

The Logrosán Sn–(W) ore deposits in the metallogenic Sn–W province of the European Variscan Belt consist of endoand 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 relatedgranite (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


Item Type:Article
Uncontrolled Keywords:Sn–W ore deposits, N2-rich fluid inclusions, Ar–Ar geochronology, Metamorphic fluids, Central Iberian Zone
Subjects:Sciences > Geology > Mineralogy
Sciences > Geology > Petrology
ID Code:54756
Deposited On:25 Mar 2019 08:39
Last Modified:27 Mar 2019 12:19

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