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Chemical variations and significance of phosphates from the Fregeneda-Almendra pegmatite field, Central Iberian Zone (Spain and Portugal)

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Abstract

Granitic pegmatites are widespread within a schist-metagreywacke complex in the Fregeneda-Almendra area (Central Iberian Zone). They intrude pre-Ordovician metasedimentary rocks and show a zonal distribution relative to the Meda-Penedono-Lumbrales granitic complex, from barren bodies to those enriched in Li, F, Sn, Nb>Ta, P and Be. Based on mineralogical criteria, these pegmatites are classified into three main categories: barren, intermediate and rare-element pegmatites, with each type including various subtypes. Phosphates are present in many pegmatites that usually occur as fine-grained accessory minerals. The most complex association of such minerals includes numerous Fe–Mn phosphates that occur in intermediate pegmatites. Al-phosphates are characteristic of Li-rich pegmatites. Electron microprobe analyses of representative phosphates reflect compositional differences depending on the pegmatite type. The Fe/(Fe+Mn) ratio of phosphates tends to decrease as the evolution degree of the pegmatites increases.

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Acknowledgements

The authors thank Drs. P. Keller, F. Hatert and P. G. Spry for their suggestions and their critical reviews that improved the manuscript. This work was financially supported by research project EHU08/02. R. Vieira was supported by Fundação para a Ciência e a Tecnologia (POCTI-FSE) grant number SFRH/BD/16911/2004.

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Authors and Affiliations

  1. Dpto. Mineralogia y Petrologia, Universidad del Pais Vasco/EHU, Apdo. 644, 48080, Bilbao, Spain

    Encarnación Roda-Robles & Alfonso Pesquera

  2. Geology Center, Porto University, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal

    Romeu Vieira & Alexandre Lima

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  1. Encarnación Roda-Robles
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  2. Romeu Vieira
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  3. Alfonso Pesquera
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  4. Alexandre Lima
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Correspondence to Encarnación Roda-Robles.

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Editorial handling: P. G. Spry

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Roda-Robles, E., Vieira, R., Pesquera, A. et al. Chemical variations and significance of phosphates from the Fregeneda-Almendra pegmatite field, Central Iberian Zone (Spain and Portugal). Miner Petrol 100, 23–34 (2010). https://doi.org/10.1007/s00710-010-0117-7

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