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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 600°C 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 |
UTAS Author: | Davidson, P (Dr Paul Davidson) |
ID Code: | 74051 |
Year Published: | 2011 |
Web of Science® Times Cited: | 33 |
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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