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Abstract:

Tourmalinites that are distally associated with tungsten deposits of the Pampa del Tamboreo area, San Luis, Argentina, contain tourmalines retaining evidence for its origin and evolution. Tourmaline grains uncommonly contain small grains of detrital tourmaline. Analysis of a single detrital tourmaline grain reveals that it is a Ca-rich "oxy-dravite". Proximal to the detrital cores there are inner domains of asymmetric tourmaline overgrowths that developed during low grade metamorphism. Volumetrically dominant tourmaline overgrowths in the outer domain are concentrically zoned aluminous dravite and "oxy-dravite" with Al/(Al + Fe + Mg) = 0.71-0.74 and Mg/(Mg + Fe) = 0.64-0.71. Variability of Al is primarily controlled by the deprotonation substitution R + OH- = Al + O2- (where R = Fe + Mg), and is a function of the activity of H2O. A likely evolutionary scenario is one in which volcanogenic material is altered by hydrothermal fluids in the sea floor resulting in an aluminous and magnesian residuum. With further hydrothermal circulation and incipient metamorphism, boron-rich fluids are expelled from metasedimentary and metavolcanic basement rocks and develop Mg-rich tourmalinites in the aluminous, magnesian host rocks. The tourmalinization process occurs over a range of metamorphic conditions and with fluids of variable activity of H2O. © 2009 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Mineral chemistry and chemical zoning in tourmalines, Pampa del Tamboreo, San Luis, Argentina
Autor:Henry, D.J.; Brodtkorb, M.K.d.
Filiación:Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States
CONICET - University of Buenos Aires, Departamento de Cs. Geológicas, Ciudad Universitaria, Pabellón 2, Argentina
Palabras clave:Chemistry; San Luis; Tourmaline; Tourmalinites; basement rock; geochemistry; host rock; hydrothermal alteration; hydrothermal fluid; low grade metamorphism; tourmaline; tourmalinite; zoning; Argentina; San Luis; South America
Año:2009
Volumen:28
Número:2
Página de inicio:132
Página de fin:141
DOI: http://dx.doi.org/10.1016/j.jsames.2009.03.001
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v28_n2_p132_Henry

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Citas:

---------- APA ----------
Henry, D.J. & Brodtkorb, M.K.d. (2009) . Mineral chemistry and chemical zoning in tourmalines, Pampa del Tamboreo, San Luis, Argentina. Journal of South American Earth Sciences, 28(2), 132-141.
http://dx.doi.org/10.1016/j.jsames.2009.03.001
---------- CHICAGO ----------
Henry, D.J., Brodtkorb, M.K.d. "Mineral chemistry and chemical zoning in tourmalines, Pampa del Tamboreo, San Luis, Argentina" . Journal of South American Earth Sciences 28, no. 2 (2009) : 132-141.
http://dx.doi.org/10.1016/j.jsames.2009.03.001
---------- MLA ----------
Henry, D.J., Brodtkorb, M.K.d. "Mineral chemistry and chemical zoning in tourmalines, Pampa del Tamboreo, San Luis, Argentina" . Journal of South American Earth Sciences, vol. 28, no. 2, 2009, pp. 132-141.
http://dx.doi.org/10.1016/j.jsames.2009.03.001
---------- VANCOUVER ----------
Henry, D.J., Brodtkorb, M.K.d. Mineral chemistry and chemical zoning in tourmalines, Pampa del Tamboreo, San Luis, Argentina. J. South Am. Earth Sci. 2009;28(2):132-141.
http://dx.doi.org/10.1016/j.jsames.2009.03.001