Artículo
Abstract:
The volumetric and morphological changes undergone by rock forming minerals due to their relative differencial thermal dilatation (contractional) coeficients arc described as mineralization emplacement control. This way, the contrasting thermal dilatation data for quartz and felspar are reviewed by volumetric modeling the effect of a significant variation of α-β quartz transition arround 575°C. The proposed dilatation of the whole rock body resulting by this phenomena could range from 0.4 % for a granitoid with a poor quartz content to 1.2% for a tipically acid rock. Thus, the strong microtectonic changes resulting from these processes on acid rocks (granites to rhyolythes) are asumed to contribute to the generation, transport and spatial distribution of late magmatic mineralization fluids. As a working hypothesis, the thermal dilatation is proposed as an important factor controlling diseminated deposits (also pegmatites, greisen and skarn mineralization) as well as their coeval deformation mechanics during both increasing or decreasing temperature changes.
Registro:
| Documento: | Artículo |
| Título: | Termotectonic controls of the locals mineralizations: A work hypothesis |
| Autor: | Rossello, E.A. |
| Filiación: | CONICET - Departamento de Ciencias Geológicas, FCEN, Ciudad Universitaria, 1428 - Buenos Aires, Argentina |
| Palabras clave: | Mineralizations; Ore emplacement; Structural control; Thermal expansion; magmatism; mineralization; morphology; ore body; spatial distribution; tectonics |
| Año: | 2007 |
| Volumen: | 26 |
| Número: | 3 |
| Página de inicio: | 191 |
| Página de fin: | 201 |
| Título revista: | Geociencias |
| Título revista abreviado: | Geociencias |
| ISSN: | 01019082 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01019082_v26_n3_p191_Rossello |
Referencias:
- CARR, D.D., Industrial minerals and rocks (1994) Society for Mining, Metallurgy and Exploration Ic, , Littleton, Co, 1196 p
- FOURNIER, R.O., POTTER II, R.W., An equation correlating the solubility of quartz in water from 25° to 900°C at pressures up to 10,000 bars (1982) Geochimica & Cosmochimica Acta, 46 (10), pp. 1969-1973
- GUILBERT, J.M., PARK, J.C.P., (1986) The geology of ore deposits, , Freeman & Co, New York, 985 p
- MCMILLAN, W.J. & PANTELEYEV, A. Porphyry copper deposits. In: ROBERTS, R.G. & SHEAHAN, P.A. (Eds.) Ore deposit models. Geoscience Canada, Reprint Series 3, p. 45-58, 1998; ROSSELLO, E.A. & REYNARD, B. Primary porosity in granitic rocks due to differential thermal expansivity of quartz and feldspars at the α-β quartz transition. In: INTERNATIONAL SYMPOSIUM ON GRANITES AND ASSOCIATED MINERALIZATIONS, 2, 1997, Salvador. Abstract... Salvador, p. 151; ROSSELLO, E.A. Influencia de la dilatación termal diferencial del cuarzo en la generación y control estructural de depósi tos diseminados: una hipótesis de trabajo. In: MÉNDEZ, V.; HERRMANN, C. & MUTTI, D.I. (Eds.), La Minería, Madre de Industrias, es Una Actividad Sostenible (Buenos Aires), p. 249-257, 2005; ROSSELLO, E.A., FERNÁNDEZ TASENDE, J., BOUQUET, M.B., Emplazamiento de pegmatitas en cúpulas graníticas: Contribución de mecanismos termotectónicos (2006) REUNIÓN DE TECTÓ NICA, 13. , San Luis. CD-Rom
- SAWKINS, F.J., Metal deposits in relation to plate tectonics (1990) Mineral and rocks, 17. , Springer Verlag Berlin, v, 461 p
- SKINNER, B.J., Thermal expansion. Handbook of Physical constants (1966) Geological Society America, Memoir, 97, pp. 75-96. , CLARKJR, S.P, Ed
- SMIRNOV, V.I., Geology of mineral deposits (1976) Mir Publishers (Moscu), , 520 p
- VAN DER MOLEN, I., VAN ROERMUND, H.L.M., The pressure path of solid inclusions in minerals: The retention of coesite inclusions during uplift (1986) Lithos, 19, pp. 317-324
Citas:
---------- APA ----------
(2007) . Termotectonic controls of the locals mineralizations: A work hypothesis . Geociencias, 26(3), 191-201.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01019082_v26_n3_p191_Rossello [ ]
---------- CHICAGO ----------
Rossello, E.A. "Termotectonic controls of the locals mineralizations: A work hypothesis " . Geociencias 26, no. 3 (2007) : 191-201.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01019082_v26_n3_p191_Rossello [ ]
---------- MLA ----------
Rossello, E.A. "Termotectonic controls of the locals mineralizations: A work hypothesis " . Geociencias, vol. 26, no. 3, 2007, pp. 191-201.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01019082_v26_n3_p191_Rossello [ ]
---------- VANCOUVER ----------
Rossello, E.A. Termotectonic controls of the locals mineralizations: A work hypothesis . Geociencias. 2007;26(3):191-201.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01019082_v26_n3_p191_Rossello [ ]
