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Article

Relative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Process

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Departamento de Geologia, Faculdade de Ciências da Universidade de Lisboa, Ed. C6, Piso 4, Campo Grande, 1749-016 Lisboa, Portugal
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Instituto Dom Luiz (IDL), Faculdade de Ciências da Universidade de Lisboa, Ed. C1, Piso 0, Campo Grande, 1749-016 Lisboa, Portugal
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Beralt Tin and Wolfram, S.A., Geology Department, 6225-051 Barroca Grande, Portugal
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Instituto de Ciências da Terra (ICT), Pólo da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(6), 551; https://doi.org/10.3390/min10060551
Received: 17 April 2020 / Revised: 6 June 2020 / Accepted: 15 June 2020 / Published: 19 June 2020
(This article belongs to the Special Issue Granite-Related Mineralization Systems)
Panasqueira is a world-class W-Sn-Cu lode-type deposit located in Portugal. It consists of a dense swarm of subhorizontal quartz lodes criss-crossed by several ENE–WSW and N–S fault zones, bordering Late Variscan granite and hosted in Late Ediacaran—Early Cambrian metasediments. The relative abundance and compositional variation (assessed with EPMA) of the main silicates, oxides and phosphates forming the quartz lodes and their margins were examined, aiming to explore: (i) mineral and geochemical zonation at the mine scale; and (ii) some conclusions on the chemical nature of prevalent fluid inflows and T-conditions of mineral deposition. Quartz lodes nearby or far from the known greisen-granite cupola display significant differences, reflecting multiple fluid influxes of somewhat distinct composition related to various opening and closing events extending for several My, ranging from an early “oxide–silicate stage” (OSS) to a “main sulfide stage” (MSS), and further on to a post-ore carbonate stage (POCS); however, a rejuvenation event occurred after MSS. The onset of OSS was placed at ca. 299 ± 5 Ma and the rejuvenation event at ca. 292 Ma. The OSS was confined to ≈500 ≤ T ≤ 320 °C, following rutile and tourmaline growth under ≈640 ≤ T ≤ 540 °C (depending on aSiO2). The rejuvenation event (≈440–450 °C) preceded a late chlorite growth (≈250–270 °C) and the progression towards POCS. View Full-Text
Keywords: granite-related W-Sn mineralization; NW Iberian Variscides; Panasqueira deposit; mineral composition variations; mineral thermometry granite-related W-Sn mineralization; NW Iberian Variscides; Panasqueira deposit; mineral composition variations; mineral thermometry
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MDPI and ACS Style

Mateus, A.; Figueiras, J.; Martins, I.; Rodrigues, P.C.; Pinto, F. Relative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Process. Minerals 2020, 10, 551. https://doi.org/10.3390/min10060551

AMA Style

Mateus A, Figueiras J, Martins I, Rodrigues PC, Pinto F. Relative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Process. Minerals. 2020; 10(6):551. https://doi.org/10.3390/min10060551

Chicago/Turabian Style

Mateus, António; Figueiras, Jorge; Martins, Ivo; Rodrigues, Pedro C.; Pinto, Filipe. 2020. "Relative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Process" Minerals 10, no. 6: 551. https://doi.org/10.3390/min10060551

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