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Tantalite-(Mn) from the Borborema Pegmatite Province, northeastern Brazil: conditions of formation and melt- and fluid-inclusion constraints on experimental studies

Citation

Thomas, R and Davidson, P and Beurlen, H, Tantalite-(Mn) from the Borborema Pegmatite Province, northeastern Brazil: conditions of formation and melt- and fluid-inclusion constraints on experimental studies, Mineralium Deposita: International Journal of Geology, Mineralogy, and Geochemistry of Mineral Deposits, 46, (7) pp. 749-759. ISSN 0026-4598 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 Springer-Verlag

DOI: doi:10.1007/s00126-011-0344-9

Abstract

Carbon dioxide-rich fluid and carbonate-rich aluminosilicate melt inclusions in tantalite-(Mn) from the Alto do Giz pegmatite in the Borborema Pegmatite Province, northeastern Brazil were investigated to constrain the formation of the host crystals. The results demonstrate that in the Alto do Giz pegmatite, water- and alkaline carbonate-rich fluids and melts are responsible for the transport and deposition of tantalite-(Mn) at temperatures around 600C and about 4 kbar. Moreover, evidence is presented to show that during crystallization of the tantalite- (Mn), three different components coexisted, which are now trapped as separate inclusions: two immiscible silicate melts (types A and B melt inclusions) and a CO2-rich aqueous fluid. We hypothesize that immiscible fluid separation may have been a critical factor in producing the water- and alkaline carbonate-rich fluids and melts necessary for Ta and Nb transport. Since the tantalite-(Mn) crystallized during pegmatite formation, this mechanism must also have implications for pegmatite genesis in general.

Item Details

Item Type:Refereed Article
Keywords:tantalum pegmatite, melt inclusions, fluid inclusions, Borborema province, Brazil
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Davidson, P (Dr Paul Davidson)
ID Code:74051
Year Published:2011
Web of Science® Times Cited:16
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2011-11-10
Last Modified:2017-10-30
Downloads:0

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