Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Roda, E. Articles by Fontan, F. Search for Related Content GeoRef GeoRef Citation

Origin and internal evolution of the Li-F-Be-B-P-bearing Pinilla de Fermoselle pegmatite (Central Iberian Zone, Zamora, Spain)

¹ Departamento de Mineralogía y Petrología, Universidad del País Vasco UPV/EHU, P.O. Box. 644, E-48080 Bilbao, Spain
² Departamento de Mineralogía y Petrología, Universidad de Granada, Fuentenueva s/n, E-18002 Granada, Spain
³ Laboratoire Cristallographie et Minéralogie, URA-067-Université Paul Sabatier, Allées Jules-Guesde 39, F-31400, Toulouse, France

Correspondence: ^* E-mail: encar.roda{at}ehu.es

The Li-F-Be-B-P bearing Pinilla de Fermoselle (PF) pegmatite occurs in the apical part of a leucogranite body. It shows a clear non-symmetrical vertical zoning from the contact with the leucogranite to a contact with the metamorphic country rocks. The pegmatitic facies evolve upward from (1) the undifferentiated Lower Border Zone (LBZ), with quartz, feldspars, muscovite, biotite, and black tourmaline, through (2) the Intermediate Zone (IZ), with quartz, muscovite, zinnwaldite, black tourmaline, and Fe-Mn phosphates, to (3) the highly evolved Upper Border Zone (UBZ), with quartz, albite, lepidolite, zinnwaldite, elbaite, and beryl. The composition of the pegmatite-forming minerals suggests that a residual melt become progressively enriched in F and Li until the crystallization of the apical UBZ, whereas P partitions in the melt only until the intermediate levels of differentiation attained in the IZ. Chemical variations in the mica and tourmaline as well as in the feldspar and Fe-Mn phosphate minerals are consistent with an internal evolution by crystal fractionation processes. A plausible model for the crystallization of the PF pegmatite involves a rapid, in situ, bottom-up crystallization from significantly undercooled liquids. The lack of metasomatic effects in the metamorphic host-rock and the estimated P content of the initial leucogranite melt suggest that the PF pegmatite mainly crystallized under closed system conditions.

This article has been cited by other articles:

				A. Zhang, R. Wang, Y. Li, H. Hu, X. Lu, J. Ji, and H. Zhang Tourmalines from the Koktokay No.3 pegmatite, Altai, NW China: spectroscopic characterization and relationships with the pegmatite evolution European Journal of Mineralogy, February 1, 2008; 20(1): 143 - 154. [Abstract] [Full Text] [PDF]

				E. Roda, P. Keller, A. Pesquera, and F. Fontan Micas of the muscovite - lepidolite series from Karibib pegmatites, Namibia Mineralogical Magazine, February 1, 2007; 71(1): 41 - 62. [Abstract] [Full Text] [PDF]

				E. RODA-ROBLES, A. PESQUERA, P. P. GIL-CRESPO, J. TORRES-RUIZ, and P. DE PARSEVAL Mineralogy and geochemistry of micas from the Pinilla de Fermoselle pegmatite (Zamora, Spain) European Journal of Mineralogy, June 1, 2006; 18(3): 369 - 377. [Abstract] [Full Text] [PDF]