Chicharro, E., Boiron, M.-C., López-García, J. Á., Barfod, D. N. and Villaseca, C. (2016) Origin, ore forming fluid evolution and timing of the Logrosán Sn-(W) ore deposits (Central Iberian Zone, Spain). Ore Geology Reviews, 72(1), pp. 896-913. (doi: 10.1016/j.oregeorev.2015.09.020)
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Abstract
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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Barfod, Dr Dan |
| Authors: | Chicharro, E., Boiron, M.-C., López-García, J. Á., Barfod, D. N., and Villaseca, C. |
| College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
| Journal Name: | Ore Geology Reviews |
| Publisher: | Elsevier |
| ISSN: | 0169-1368 |
| ISSN (Online): | 1872-7360 |
| Copyright Holders: | Copyright © 2015 The Authors |
| First Published: | First published in Ore Geology Reviews 72(1):896-913 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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