phosphate derivatives; triphylite; montebrasite; pegmatite; LCT; Argentina
Abstract :
[en] La Viquita is a rare-element pegmatite of LCT signature, REL-Li subclass, spodumene subtype, that shows Fe. Mn mineral paragenesis instead of Mn. Fe, which is more common in the rare-element pegmatite population of the San Luis ranges. The phosphate mineral association of this pegmatite can be subdivided into (1) primary, with dendritic triphylite [(Fe/ (Fe þ Mn) ¼ 0.72] and montebrasite-amblygonite as main phases; (2) metasomatic, with subsolidus replacement of triphylite by ferrisicklerite and heterosite; and (3) hydrothermal, with secondary growth of alluaudite at the expense of heterosite and wardite from montebrasite caused by Na-metasomatism. A Ca-rich influx under oxidizing conditions produced childrenite-eosphoriteernstite, jahnsite-(CaMnFe), and kingsmountite. Apatite-group minerals are present throughout the processes. Very late-stage solutions formed millimetric crystals of hydroxylherderite associated with hydroxylapatite in cavities in K-feldspar.
ANGELELLI, V. & RINALDI, C.A. (1963) Yacimientos de minerales de Li de las provincias de San Luis y Córdoba. Comisión Nacional de Energía Atómica 91, (unpublished report).
BAIJOT, M., HATERT, F., & PHILIPPO, S. (2012) Mineralogy and geochemistry of phosphates and silicates in the Sapucaia pegmatite, Minas Gerais, Brazil: Genetic implications. Canadian Mineralogist 50(6), 1531-1554.
BAIJOT, M., HATERT, F., DAL BO, F., & PHILIPPO, S. (2014) Mineralogy and petrography of phosphate mineral associations from the Jocaõ pegmatite, Minas Gerais, Brazil. Canadian Mineralogist 52(2), 373-397.
ˇ CERNÁ, I., ˇ CERŃY, P., & FERGUSON, R.B. (1973) The fluorine content and some physical properties of the amblygonite montebrasite minerals. American Mineralogist: Journal of Earth and Planetary Materials 58(3-4), 291-301.
ˇ CERŃY, P. & ERCIT, T.S. (2005) The classification of granitic pegmatites revisited. Canadian Mineralogist 43, 2005-2026.
ˇ CERN Y, P., SELWAY, J.B., ERCIT, T.S., BREAKS, F.W., ANDERSON, A.J., & ANDERSON, S.D. (1998) Graftonite-Beusite in granitic pegmatites of the Superior Province: A study in contrasts. Canadian Mineralogist 36, 367-376.
ˇ CERŃY, P., GALLISKI, M. Á ., TEERTSTRA, D. K., MARTÍNEZ, V. M., CHAPMAN, R., OTTOLINI, L., & FERREIRA, K. (2011) A metastable disequilibrium assemblage of hydrous highsanidine adulariae low albite from La Viquita granitic pegmatite, San Luis Province, Argentina. PEG 2011, Asociación Geológica Argentina, Serie D-Publicación Especial 14, 49-52.
FRANSOLET, A. M. (1980) The eosphorite-childrenite series associated with the Li-Mn-Fe phosphate minerals from the Buranga pegmatite, Rwanda. Mineralogical Magazine 43(332), 1015-1023.
FRANSOLET, A. M., KELLER, P., & FONTAN, F. (1986) The phosphate mineral associations of the Tsaobismund pegmatite, Namibia. Contributions to Mineralogy and Petrology 92, 502-517.
GALLISKI, M.A., MA RQUEZ-ZAVALÍA, M.F., ˇ CERN Y, P., MARTÍNEZ V.A., & CHAPMAN, R. (2008) The Ta-Nb-Sn-Ti Oxide-minerals paragenesis from La Viquita, a spodumene-bearing rare-element granitic pegmatite, San Luis, Argentina. Canadian Mineralogist 46, 379-393.
GALLISKI, M.A., OYÁ RZABAL, J.C., MA RQUEZ-ZAVALÍA, M.F., & CHAPMAN, R. (2009) The association qingheiite-beusitelithiophilite in the Santa Ana pegmatite, San Luis, Argentina. Canadian Mineralogist 47(4), 1213-1223.
GALLISKI, M. A., ˇ CERŃY, P., MA RQUEZ-ZAVALÍA, M.F., & CHAPMAN, R. (2012) An association of secondary Al-Li-Be-Ca-Sr phosphates in the San Elías pegmatite, San Luis, Argentina. Canadian Mineralogist 50, 933-942.
HATERT, F., OTTOLINI, L., & SCHMID-BEURMANN, P. (2011) Experimental investigation of the alluaudite triphylite assemblage, and development of the Na-in-triphylite geothermometer: Applications to natural pegmatite phosphates. Contributions to Mineralogy and Petrology 161(4), 531-546.
HURLBUT, C.S., JR. (1950) Childrenite-eosphorite series. American Mineralogist 35, 793-805.
HURLBUT, C.S., JR., & ARISTARAIN, L.F. (1968) Beusite, a new mineral from Argentina, and the graftonite-beusite series. American Mineralogist 53, 1799-1814.
KELLER, P. (1988) Dendritic phosphate minerals and their paragenetic relation to the silicate minerals of the pegmatites from Namibia and from the Black Hills, South Dakota, USA. Neues Jahrbuch fur Mineralogie-Abhandlungen 159(3), 249-281.
KELLER, P. & VON KNORRING, O. (1989) Pegmatites at the Okatjimukuju farm, Karibib, Namibia Part I: Phosphate mineral associations of the Clementine II pegmatite. European Journal of Mineralogy 1, 567-593.
KELLER, P., FONTAN, F., & FRANSOLET, A.M. (1994) Intercrystalline cation partitioning between minerals of the triplite-zwieselite-magniotriplite and the triphylite-lithiophilite series in granitic pegmatites. Contributions to Mineralogy and Petrology 118, 239-248.
KRETZ, R. (1983) Symbols for rock-forming minerals. American Mineralogist 68, 277-279.
LONDON, D. (2008) Pegmatites. Canadian Mineralogist Special Publication 10, 347 pp.
MARTIN, R.F. & DE VITO, C. (2014) The late-stage miniflood of Ca in granitic pegmatites: An open-system acid-reflux model involving plagioclase in the exocontact. Canadian Mineralogist 52(2), 165-181.
MARTÍNEZ, V. (2005) Geología y Mineralogía comparativa de diferentes tipos de pegmatitas litíferas de la provincia de San Luis, Argentina. Doctoral thesis, Inédito, Universidad Nacional de Córdoba, Córdoba, Argentina, 240 pp.
MARTÍNEZ, V. & GALLISKI, M.A. (2000) La Viquita, Sierra de la Estanzuela, San Luis: Geología de una pegmatita de subtipo espodumeno enriquecida en óxidos de Nb-Ta-Ti-Sn. In Mineralogía y Metalogenia 2000 6 (I. Schalamuk, M. Brodtkorb, & R. Etcheverry, eds.). Instituto de Recursos Minerales, Universidad Nacional de La Plata, La Plata, Argentina (295-303).
MASON, B. (1941) Minerals of the Varuträsk Pegmatite: XXIII. Some iron-manganese phosphate minerals and their alteration products, with special reference to material from Varuträsk. Geologiska Föreningen i Stockholm Förhandlingar 63(2), 117-174.
MOORE, P.B. (1973) Pegmatite phosphates: Descriptive mineralogy and crystal chemistry. Mineralogical Record 4(3), 103-130.
NIZAMOFF, J. (2006) The Mineralogy, Geochemistry and Phosphate Paragenesis of the Palermo #2 Pegmatite, North Groton, New Hampshire. University of New Orleans Theses and Dissertations, Paper 398, New Orleans, Louisiana, United States.
POUCHOU, J. L. & PICHOIR, F. (1985) "PAP" (/qZ) correction procedure for improved quantitative microanalysis. In Microbeam Analysis (J. T. Armstrong, ed.). San Francisco Press, San Francisco, California, United States (104-106).
QUENSEL, P. (1937) Minerals of the Varuträsk Pegmatite: I. The Lithium-Manganese Phosphates. Geologiska Föreningen i Stockholm Förhandlingar 59(1), 77-96.
RODA-ROBLES, E., FONTAN, F., PESQUERA, A., & VELASCO, F. (1996) The phosphate mineral association of the granitic pegmatites of the Fregeneda area (Salamanca, Spain). Mineralogical Magazine 60, 767-778.
RODA-ROBLES, E., FONTAN, F., PESQUERA, A., & KELLER, P. (1998) The Fe-Mn phosphate associations from the Pinilla de Fermoselle pegmatite, Zamora, Spain: Occurrence of kryzhanovskite and natrodufrénite. European Journal of Mineralogy 10, 155-167.
RODA-ROBLES, E., PESQUERA, A., FONTAN, F., & KELLER, P. (2004) Phosphate mineral associations in the Cañada pegmatite (Salamanca, Spain): Paragenetic relationships, chemical compositions, and implications for pegmatite evolution. American Mineralogist 89(1), 110-125.
RODA-ROBLES, E., VIEIRA, R., PESQUERA, A., & LIMA, A. (2010) Chemical variations and significance of phosphates from the Fregeneda-Almendra pegmatite field, Central Iberian Zone (Spain and Portugal). Mineralogy and Petrology 100(1-2), 23-34.
RODA-ROBLES, E., GALLISKI, M. A., ROQUET, M. B., HATERT, F., & DE PARSEVAL, P. (2012) Phosphate nodules containing two distinct assemblages in the Cema granitic pegmatite, San Luis province, Argentina: Paragenesis, composition and significance. Canadian Mineralogist 50(4), 913-931.
SEELIGER, E. & MÜ CKE, A. (1970) Ernstit, ein neues Mn2-Fe3-Al-phosphat und seine beziehungen zum eosphorit. Neues Jahrbuch für Mineralogie-Monatshefte 1970, 289-298.
SIMS, J.P., SKIRROW, R. G., STUART-SMITH, P. G., & LYONS, P. (1997) Informe geológico y metalogenético de las Sierras de San Luis y Comechingones (provincias de San Luis y Córdoba), 1:250.000. Anales XXVIII, Instituto de Geolog ía y Recursos Minerales, SEGEMAR, Buenos Aires, Argentina.
SMEDS, S. A., UHER, P., ˇCERNY, P., WISE, M. A., GUSTAFSSON, L., & PENNER. P. (1998) Graftonite-beusite in Sweden: Primary phases, products of exsolution, and distribution in zoned populations of granitic pegmatites. Canadian Mineralogist 36, 377-394.
TAIT, K. T., HAWTHORNE, F. C., ˇ CERŃY, P., & GALLISKI, M. A. (2004) Bobfergusonite from the Nancy pegmatite, San Luis Range, Argentina: Crystal-structure refinement and chemical composition. Canadian Mineralogist 42(3), 705-716.
WLODEK, A., GROCHOWINA, A., GOL?EBIOWSKA, B., & PIECZKA, A. (2015) A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland. Journal of Geosciences 60(1), 45-72.
