Preliminary Investigation of Ba-Rich Sanidine in Phonolites of Badmer, Rajasthan
Keywords:
Ba-Rich Sanidine, Badmer, Melaphonolite, Rajasthan.Abstract
In melaphonolite of the Sarnu-Dandali, Badmer alkaline complex, high Ba- K-feldspar (sanidine) occurs as phenocrysts. Ba concentration ranges between 2% and 10% by weigth from core to rim. Many BSE images of this Barich sanidine were examined. Large numbers of zoned Ba-rich sanidine phenocrysts were analysed using electron microprobe. BaO shows positive correlation with Al2O3 while there is negative correlation between BaO and K2O suggesting substitution of K by Ba. Petrographic evidence is clear that K-feldspar phenocrysts reacted with the melt which was getting richer in Ba during fractionation of melanephelinite to melaphonolite and subsequently this Ba deposited on the rims of K-feldspar. This short note reports results of preliminary investigation of number of Ba-rich sanidine grains from melaphonolite of Badmer and suggests incompatible behaviour Ba and that it was getting enriched in the melt during crystallization of magma.Downloads
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ANDERSON, A.T., DAVIS, A.M. and LU, F. (2000) Evolution of Bishop tuff rhyolitic magma based on melt and magnetite inclusions and zoned phenocrysts. Jour. Petrol., v.41, pp.449–473.
AZZONE, R.G., RUBERTI, E., ENRICH, G.E.R. and GOMES, C.B. (2009) Zr- and Ba-rich minerals from the Ponte Nova Alkaline massif Southeastern Brazil: Indication of an enriched mantle source. Canadian Mineral., v.47, pp.1087-1103
CAMPBELL, I.A. and GRIFFITHS, R.W. (1990) Implications of mantle plume structure for the evolution of flood basalts. Earth Planet. Sci. Lett., v.99, pp.79-93.
CHAKHMOURADIAN, A.R. and MITCHELL, R.H. (2002) The mineralogy of Ba- and Zr- rich alkaline pegmatites from Gordon Butte, Crazy Mountains, (Montana, USA): comparison between potassic and sodic agpaitic pegmatites. Contrib. Mineral. Petrol., v.143, pp.93-114.
CHANDRASEKARAN, V., SRIVASTAVA, R.K. and CHAWADE, M.P. (1990) Geochemistry of the alkaline rocks of Sarnu-Dandali Area, District Badmer, Rajasthan, India. Jour. Geol. Soc. India, v.36, pp.365-382.
CUNDARI, A. (1979) Petrogenesis of leucite-bearing lavas in the Roman volcanic region, Italy. Contrib. Mineral. Petrol., v.70, pp9-21.
DEER, W.A., HOWIE, R.A. and ZUSSMAN, J. (2001) Rock-Forming Minerals. 4A. Framework Silicates: Feldspars (2nd ed.). Geol. Soc. London, U.K.
EDGAR, A. (1992) Barium-rich phlogopite and biotite from some Quaternary alkali mafic lavas, West Eifel, Germany. European Jour. Mineral., v.4, pp.321-330.
ESSENE, E.J., CLAFLIN, C.L., GIORGETTI, G., MATA, P.M., PEACOR, D.R., íRKAI, P. and RATHMELL, M.A. (2005) Two, three- and four-feldspar assemblages with hyalophane and celsian: implications for phase equilibria in BaAl2Si2O8–CaAl2Si2O2–NaAlSi3O8–KAlSi3O8. European Jour. Mineral., v.17, pp.515-535.
FERGUSON, A.K. and CUNDARI, A. (1982) Feldspar crystallization trends in leucite- bearing and related assemblages. Contrib. Mineral. Petrol., v.81, pp.212-218.
FLOHR, M.J. and ROSS, M. (1990) Alkaline igneous rocks of Magnet Cove, Arkansas: Mineralogy and geochemistry of syenites, Lithos, v.26, pp.67-98.
GAY, P. and ROY, N.N. (1968) The mineralogy of potassium-barium feldspar series III: subsolidus relationships. Mineral. Magz., v.36, pp.914-932.
GUO, J. and GREEN, T.H. (1989) Barium partitioning between alkali feldspar and silicate liquid at high pressure and temperature. Contrib. Mineral. Petrol., v.102, pp.328-335.
LE BAS, M.J. (1987) Nephelinites and carbonatites. In: J.G. Fitton and B.G.J. Upton (Eds.), Alkaline Igneous Rocks. Geol. Soc. London. Spec. Publ., no.30, pp.53-83
NARAYAN DAS, G.R., BAGCHI, A.K., CHAUBE, D.N., SHARMA, C.V. and NAVANEETHAM, K.V. (1978) Rare metal content, geology and tectonic setting of the alkaline complexes across the Trans Aravalli region, Rajasthan. Recent Researches in Geology, v.7, pp.201-217.
NEMEC, D. (1975) Barium in K-feldspar megacrysts from granitic and syenitic rocks of the Bohemian Massif. Tschermaks Mineral. Petrogr. Mitt., v.22, pp.109-116.
NKOUMBOU, C., DERUELLE, B. and VELDE, D. (1995) Petrology of Mt Etinde nephelinite series. Jour. Petrol., v.36, pp.373-395.
PENG, Z.-X. and MAHONEY, J.-J. (1995). Drillhole lavas from the north- India western Deccan Traps, and the evolution of Re´union hotspot mantle. Earth Planet. Sci. Lett., v.134, pp.169–185.
RAITH, M.M, DEVARAJU, T.C. and SPIERING, B. (2014) Paragenesis and chemical characteristics of the celsian-hyalophane Kfeldspar series and associated Ba-Cr micas in barite- bearing strata of the Mesoarchaean Ghattiosahalli Belt, Western Dharwar Craton, South India. Mineral. Petrol., v.108, pp.153-176
SIMONETTI, A and BELL, K. (1994) Nd, Pb and Sr isotopic data from the Napak carbonatitenephelinite centre eastern Uganda: an example of open system crystal fractionation. Contrib. Mineral. Petrol., v.115, pp.356-366.
SINGER, B.S., DUNGAN M.A. and LAYNE, G.D. (1995) Textures and Sr, Ba, Mg, Fe, K and Ti compositional profiles in volcanic plagioclase: Clues to the dynamics of calc-alkaline magma chambers. Amer. Mineral., v.80, pp.776–798.
UDAS, G.R. (1974) Geochemistry of Precambrian carbonatite complexes of India: Present status of and gaps in our knowledge. Jour. Geol. Soc. India, v.7, pp.457-462.
VILADKAR, S.G. (2012) Petrological problems of Badmer nephelinite-phonolite association Rajasthan, India. (abs). International conference on ore potentials of alkaline, kimberlite and carbonatite magmatism, Ukraine.
YANEV, Y., STOYKOV, S. and PECHKAY, Z. (1998) Petrology and KAr dating of the Paleogene magmatism in the region of the villages Yabalkov and Stalevo, eastern Rhodopes volcanic area. Geokhim., Mineral., Petrol., v.34, pp.97-110.
ZHANG, M., STUDDABY, P., THOMPSON R.N., and DUNGAN, M.A. (1993a) The origins of contrasting zoning patterns in hyalophane from olivine leucitites, NE China. Mineral. Magz., v.57, pp.565-573.