GRANITIC PEGMATITES OF THE O'GRADY BATHOLITH, N.W.T., CANADA: A CASE STUDY OF THE EVOLUTION OF THE ELBAITE SUBTYPE OF RARE-ELEMENT GRANITIC PEGMATITE

2003 ◽  
Vol 41 (1) ◽  
pp. 117-137 ◽  
Author(s):  
T. S. Ercit ◽  
L. A. Groat ◽  
R. A. Gault
Keyword(s):  
Granitic Pegmatite ◽  
Rare Element ◽  
Granitic Pegmatites

LA-ICP-MS U Pb columbite ages and trace-element signature from rare-element granitic pegmatites of the Pampean Pegmatite Province, Argentina

Lithos ◽  
2021 ◽  
Vol 386-387 ◽  
pp. 106001
Author(s):  
Miguel Ángel Galliski ◽  
Albrecht von Quadt ◽  
María Florencia Márquez-Zavalía
Keyword(s):  
Trace Element ◽  
Rare Element ◽  
Granitic Pegmatites ◽  
Icp Ms ◽  
Trace Element Signature

THE Ta-Nb-Sn-Ti OXIDE-MINERAL PARAGENESIS FROM LA VIQUITA, A SPODUMENE-BEARING RARE-ELEMENT GRANITIC PEGMATITE, SAN LUIS, ARGENTINA

2008 ◽  
Vol 46 (2) ◽  
pp. 379-393 ◽  
Author(s):  
M. A. Galliski ◽  
M. F. Marquez-Zavalia ◽  
P. Cerny ◽  
V. A. Martinez ◽  
R. Chapman
Keyword(s):  
Granitic Pegmatite ◽  
Rare Element ◽  
Mineral Paragenesis ◽  
Oxide Mineral ◽  
San Luis

Experimental study of the equilibrium between pollucite, albite and hydrothermal fluid in pegmatitic systems

1990 ◽  
Vol 54 (376) ◽  
pp. 447-454 ◽  
Author(s):  
Ansom Sebastian ◽  
Martine Lagache
Keyword(s):  
Experimental Study ◽  
Hydrothermal Fluid ◽  
Hydrothermal Solution ◽  
Silicate Mineral ◽  
Rare Element ◽  
Granitic Pegmatites

AbstractPollucite is a silicate mineral of the rare element caesium, occurring in granitic pegmatites. Experiments have been carried out at 450, 600, and 750°C, 1.5 kbar, to study the equilibrium between pollucite, albite and the co-existing hydrothermal solution. When pollucite co-exists with albite, the alkaline composition of the solution is buffered. The Cs/Na ratio of the solution has been determined to be 0.11 at 450°C 0.22 at 600°C and 0.23 at 750°C. Pollucite contains about 15 mol.% of sodium, whereas albite is almost purely sodic. In nature, pollucite with more than 82 mol.% caesium has never been found. This can be explained by the absence of solutions in granitic pegmatites having a higher Cs/Na ratio than those determined by us.

scholarly journals Nb–Ta–(Ti–Sn) oxide mineral chemistry as tracer of rare-element granitic pegmatite fractionation in the Borborema Province, Northeastern Brazil

2007 ◽  
Vol 43 (2) ◽  
pp. 207-228 ◽  
Author(s):  
Hartmut Beurlen ◽  
Marcelo R. R. Da Silva ◽  
Rainer Thomas ◽  
Dwight R. Soares ◽  
Patrick Olivier
Keyword(s):  
Mineral Chemistry ◽  
Northeastern Brazil ◽  
Granitic Pegmatite ◽  
Rare Element ◽  
Oxide Mineral ◽  
Borborema Province

scholarly journals Rare-element granitic pegmatite of Miocene age emplaced in UHP rocks from Visole, Pohorje Mountains (Eastern Alps, Slovenia): accessory minerals, monazite and uraninite chemical dating

2014 ◽  
Vol 65 (2) ◽  
pp. 131-146 ◽  
Author(s):  
Pavel Uher ◽  
Marian Janák ◽  
Patrik Konečný ◽  
Mirijam Vrabec
Keyword(s):  
Late Miocene ◽  
Volcanic Rocks ◽  
Eastern Alps ◽  
Granitic Pegmatite ◽  
Fault System ◽  
Rare Element ◽  
Accessory Minerals ◽  
Precipitation Temperature ◽  
The Alps ◽  
Chemical Dating

Abstract The granitic pegmatite dike intruded the Cretaceous UHP rocks at Visole, near Slovenska Bistrica, in the Pohorje Mountains (Slovenia). The rock consists mainly of K-feldspar, albite and quartz, subordinate muscovite and biotite, while the accessory minerals include spessartine-almandine, zircon, ferrocolumbite, fluorapatite, monazite- (Ce), uraninite, and magnetite. Compositions of garnet (Sps48-49Alm45-46Grs + And3-4 Prp1.5-2), metamict zircon with 3.5 to 7.8 wt. % HfO2 [atom. 100Hf/(Hf + Zr) = 3.3-7.7] and ferrocolumbite [atom. Mn/(Mn + Fe) = 0.27-0.43, Ta/(Ta + Nb) = 0.03-0.46] indicate a relatively low to medium degree of magmatic fractionation, characteristic of the muscovite - rare-element class or beryl-columbite subtype of the rare-element class pegmatites. Monazite-(Ce) reveals elevated Th and U contents (≤11 wt. % ThO2, ≤5 wt. % UO2). The monazite-garnet geothermometer shows a possible precipitation temperature of ~495 ± 30 °C at P~4 to 5 kbar. Chemical U-Th-Pb dating of the monazite yielded a Miocene age (17.2 ± 1.8 Ma), whereas uraninite gave a younger (~14 Ma) age. These ages are comtemporaneous with the main crystallization and emplacement of the Pohorje pluton and adjacent volcanic rocks (20 to 15 Ma), providing the first documented evidence of Neogene granitic pegmatites in the Eastern Alps. Consequently, the Visole pegmatite belongs to the youngest rare-element granitic pegmatite populations in Europe, together with the Paleogene pegmatite occurrences along the Periadriatic (Insubric) Fault System in the Alps and in the Rhodope Massif, as well as the Late Miocene to Pliocene pegmatites in the Tuscany magmatic province (mainly on the Island of Elba).

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