Abstract
We report for the first time the occurrence of rare phosphate wagnerite as a stable phase from the Mg–Al granulites of Sonapahar. The wagnerite bearing assemblages consist of the spinel, phlogopite, brucite and corundum. The wagnerite appears in the Mg–Al granulites due to the break-down of spinel and fluorapatite. The mineral chemistry of the phases has been discussed from the EPMA data, which reveals that the fluorine content of the wagnerite is relatively low due to the exchange of F to coexisting phases. The major oxide analysis of the rocks show the low content of Ca, which is the requisite for the occurrences of wagnerite.
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References
Brunet F, Chopin C and Seifert F 1998 Phase relationship in MgO–\(\text{ P }_{2}\text{ O }_{5}{-}\text{ H }_{2}\text{ O }\) system and the stability of phospho-ellenbergerite: Petrological implications; Contrib. Mineral. Petrol. 131 54–70.
Chakraborty S 1990 Petrography, geochemistry and geochronology of parts of south Khasi granite and krydem granite, Khasi Hills, Meghalaya; Rec. Geol. Surv. India 123 153–160.
Chatterjee N, Mazumder A C, Bhattacharya A and Saikia R R 2007 Mesoproterozoic granulites of the Shillong-Meghalaya Plateau: Evidence of westward continuation of the Prydz Bay Pan-African suture into northeastern India; Precamb. Res. 152 1–26.
Crawford A R 1974 Indo-Antarctica Gondwanaland and pattern of the distribution of the granulitic belt; Tectonophys. 22 141–157.
Dwivedi S B 2011 Geodynamic evolution of Mesoproterozoic Granulites of Meghalaya: Evident from Geothermobarometry, P–T path and P–T pseudosection; Geol. Soc. India Memoir 77 85–101.
Dwivedi S B and Theunuo K 2011 Two-pyroxene bearing granulites from Patharkhang, Shillong–Meghalaya Gneissic Complex (SMGC); Curr. Sci. 100 100–105.
Dwivedi S B and Theunuo K 2013 Petrology and geochemistry of metapelites and basic granulite from Sonapahar region of Shillong Meghalaya Gneissic Complex, north east India; Geol. Soc. India 81 755–756.
Grew E S 1981 Surinamite, taaffeite, and beryllian sapphirine from pegmatites in granulite-facies rocks of Casey Bay, Enderby Land, Antarctica; Am. Mineral. 66 1022–1033.
Grew E S, Armbruster T, Medenbach O and Yates M G 2007 Chopinite [(Mg, Fe)\(_{3}]\) (PO\(_{4})_2\), a new mineral isostructural with sarcopside from a fluorapatite segregation in granulite-facies paragneiss. Larsmann Hills, Prydz Bay, East Antarctica; European. J. Mineral. 19 229–245.
Iroisechek-Zumuthor A and Armbruster T 1985 Wagnerite from a metapelites rock of the Shimano Nappe (Leontine Alps, Switzerland); Schweiz. Mineral. Mitt. 65 137–151.
Lal R K, Ackermand D, Seifert F and Haldar S K 1978 Chemographic relationships in sapphirine-bearing rocks from Sonapahar, Assam, India; Contrib. Mineral. Petrol. 67 69–187.
Leroux M V and Ercit T S 1992 Wagnerite, an accessory phase in cordierite-anthophyllite gneiss from Star Lake, Manitoba; Cand. Mineral. 30 1161–1166.
Mazumder S K 1986 The Precambrian framework of part of the Khasi Hills, Meghalaya; Geol. Surv. India Rec. 117 1–59.
Mazumder S K 1976 A summary of the Precambrian geology of Khasi Hills, Meghalaya; Geol. India Misc. Publ. 23 311–334.
Medlicott H B 1869 Geological sketch of the Shillong Plateau in N-E Bengal; Geol. Surv. India Memoir 7 151–207.
Nandy D R 2001 Geodynamics of the northeastern India and the adjoining region; ACB Publications, Kolkata 209.
Novak M and Povondra B P 1984 Wagnerite from Skrinarov, Central Czechoslovakia; Neues. Jahrbuch. Mineralogie-Monatshefte 12 536–542.
Ouzegane K, Guirud M and Zhesheng M A 2003 Prograde and retrograde evolution in high-temperature corundum granulites (FMAS and KFMASH systems) from In Ouzzal trrane (NW Hoggar, Algeria); J. Petrol. 44 517–545.
Pitra P, Boulvais P, Antonoff V and Diot H 2008 Wagnerite in cordierite-gedrite gneiss: Witness of long tern fluid–rock interaction in continental crust(lle d’ Yeu, Armorican Massif, France); Am. Mineral. 93 315–326.
Ren L, Grew E S, Xiong M and Zhesseng M A 2003 Wagnerite-Ma5bc, a new polytype of \(\text{ Mg }_{2}(\text{ PO }_{4})\)(F, OH), from granulite-facies paragneiss, Larsmann Hills, Prydz Bay, east Antarctica; Canad. Mineral. 41 393–411.
Saini N K, Mukherjee P K, Rathi M S, Khanna P P and Purohit K K 1998 A new geochemical reference sample of granite (DH-G) from Dalhousie, Himachal Himalaya; J. Geol. Soc. India 52 603–606.
Sheridan D M, Mars S P, Mrose M E and Taylor R B 1976 Mineralogy and geology of the wagnerite occurrence on Santa Fe Mountain Front Range, Colorado; US Geol. Sruv. Prof. Paper 955 1–23.
Simmat R and Rickers K 2000 Wagnerite in high-MgAl granulites of Anakapalle, Eastern Ghats Belt, India; European J. Mineral. 12 661–666.
Vry J K and Cartwright J 1994 Sapphirine-kornerupine rocks from the Reynolds Range, central Australia: Constraints on the uplift history of a Proterozoic low-pressure terrain; Contrib. Mineral. Petrol. 116 78–91.
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The authors acknowledge the Department of Science and Technology, Government of India, New Delhi (ESS/15/304/2005) for financial support for this work. The anonymous reviewers are acknowledged for their constructive comments and suggestions to improve the manuscript.
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Dwivedi, S.B., Theunuo, K. Occurrence of wagnerite in Mg–Al granulites of Sonapahar, Meghalaya. J Earth Syst Sci 126, 52 (2017). https://doi.org/10.1007/s12040-017-0829-8
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DOI: https://doi.org/10.1007/s12040-017-0829-8