Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-27T16:32:43.922Z Has data issue: false hasContentIssue false
  • English
  • Français

Oxynatromicrolite, (Na,Ca,U)2Ta2O6(O,F), a new member of the pyrochlore supergroup from Guanpo, Henan Province, China

Published online by Cambridge University Press:  02 January 2018

Fan Guang ,
Ge Xiangkun ,
Li Guowu ,
Yu Apeng  and
Shen Ganfu
Fan Guang*
Affiliation:
Beijing Research Institute of Uranium Geology, 100029 Beijing, China
Ge Xiangkun
Affiliation:
Beijing Research Institute of Uranium Geology, 100029 Beijing, China
Li Guowu
Affiliation:
Laboratory of Crystal Structure, China University of Geoscinces (Beijing), 100083 Beijing, China
Yu Apeng
Affiliation:
Beijing Research Institute of Uranium Geology, 100029 Beijing, China
Shen Ganfu
Affiliation:
Chengdu Institute of Geology and Mineral Resources, 610082 Chengdu, China
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

A new mineral species of the pyrochlore supergroup, oxynatromicrolite (IMA2013-063), (Na,Ca,U)2Ta2O6O, was found in the No. 309 rare-metal granitic pegmatite vein, Guanpo, Lushi county, Henan Province, China, which is characterized by tantalum at theB site and oxygen at the Y site and is Na dominant at the A site. The mineral occurs as strongly metamict, and mostly euhedral octahedral crystals up to 0.05–0.20 mm across. The measured density of an unheated sample is 6.580(4) g cm–3, and the calculatedone is 6.506 g cm–3. Optically, the mineral is isotropic, with an index of refraction 1.999(5) and a reflectance of 11.88% (470 nm). When heated to 1000°C for 4 hours in N2, the mineral recrystallizes in the cubic system, with space group Fd3mand with unit-cell parameters similar those of other pyrochlore supergroup species: a = 10.420(6) Å, V = 1131.4(2) Å3. Electron microprobe analyses revealed the following composition of the mineral (in wt.%): Na2O 5.41, CaO 4.56, UO214.60, La2O3 0.16, Ce2O3 0.11, Nd2O3 0.13, PbO 0.62, Ta2O5 61.52, Nb2O5 8.21, Sb2O5 0.23, TiO2 0.05, SiO2 0.56, SnO2 0.29, F1.04, H2O 1.50 (calculated to correspond to 0.47 H2O pfu), F≡O –0.44, sum = 98.53%, which corresponds to the empirical formula (Na0.99Ca0.46U0.31Pb0.02La0.01H2O0.21)∑2.00(Ta1.58Nb0.35Si0.05Sn0.01Sb0.01)∑2.00O6 (O0.43F0.31H2O0.26)∑1.00, represented by the simplified formula (Na,Ca,U)2(Ta,Nb)2O6(O,F).Oxynatromicrolite crystallized during the late-stage of formation for the No. 309 pegmatite dyke and is associated with quartz, albite, potassium feldspar, muscovite, kaolinite, tantalite-Mn, stibiotantalite, pollucite, spodumene, montebrasite, Hf-rich zircon, a red tourmaline, polylithionite,trilithionite, luanshiweiite-2M1 (IMA2011-102) and a hydrated derivative of oxynatromicrolite.

Keywords

oxynatromicrolitenew mineral speciesmicrolite grouppyrochlore supergroupGuanpoHenanChina
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 4 , August 2017 , pp. 743 - 751
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Atencio, D., Andrade, M.B., Christy, A.G., Giere, R. and Kartashov, P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48, 673–698.CrossRefGoogle Scholar
Cámara, F., Williams, C.T., Ventura, G.D., Oberti, R. and Caprilli, E. (2004) Non-metamict betafite Le Carcarelle (Vico volcanic complex, Italy): occurrence and crystal structure. Mineralogical Magazine, 68(6), 939–950.CrossRefGoogle Scholar
Černý, P. (1991) Rare-element granitic pegmatites: Part 1: Anatomy and internal evolution of pegmatite deposits; Part 2: Regional to global environments and petro-genesis. Geoscience Canada, 18, 49–81.Google Scholar
Černý, P. and Ercit, T.S. (2005) The classification of granitic pegmatites revisited. The Canadian Mineralogist, 43, 2005–2026.CrossRefGoogle Scholar
Chang, H.L. and Huang, Z.L. (1998) Melt-fluid inclu-sions in topaz from the Jianfengling pegmatoid. Acta Petrologica et Mineralogica, 17(1), 81–86.Google Scholar
Ewing, R.C. (1975) Alteration of metamict, rare-earth, AB2O6-type Nb-Ta-Ti oxides. Geochimica et Cosmochimica Acta, 39, 521–530.CrossRefGoogle Scholar
Fan, G., Li, G.W., Shen, G.F., Xu, J.S. and Dai, J. (2013a) Luanshiweiite: a new member of lepidolite series. Acta Mineralogica Sinica, 33(4), 713–721 [in Chinese with English abstract].Google Scholar
Fan, G., Ge, X.K., Li, G.W., Yu, A.P. and Shen, G.F. (2013b) Oxynatromicrolite, IMA 2013-063. CNMNC Newsletter No. 17, October 2013, page 3004; Mineralogical Magazine, 77, 2997–3005.Google Scholar
He, R.L. and Cao, E.K. (1985) The characteristics of bismuth-tantalum-antimony ore within granite peg-matite in Guanpo area, Henan Province. Geology of Shaanxi, 3(2), 39–46 [in Chinese].Google Scholar
Hogarth, D.D. (1977) Classification and nomenclature of th. pyrochloregroup. American Mineralogist, 62, 403–10.Google Scholar
Jahns, R.H. and Ewing, R.C. (1977) The Harding mine, Taos County, New Mexico. Mineralogical Record, 8, 115–126.Google Scholar
Kovalenko, N.I. (1979) The Experimental Study on Formation of Li-F Rare-metal Granites. Nauka Press, Moscow, 152 pp. [in Russian].Google Scholar
Li, G.W., Shi, N.C., Ma, Z.S. and Xiong, M. (2005) A new method for powder-like diffractograms of small single crystals using a SMART APEX CCD detector. Acta Mineralogical Sinica, 25(1), 9–14 [in Chinese with English abstract].Google Scholar
Linnen, R.L. (1998) The solubility of Nb-Ta-Zr-Hf-W in granitic melts with Li and Li+F: Constraints for mineralization in rare-metal granites and pegmatites. Economic Geology, 93, 1013–1025.CrossRefGoogle Scholar
Linnen, R.L. and Cuney, M. (2005) Granite-related rare-element deposits and experimental constraints on Ta-Nb-W-Sn-Zr-Hf mineralization. Pp. 175–199 in: Rare-Element Geochemistry and Mineral Deposits (Linnen, R.L. and Sampson, I.M., editors). Geological Society of Canada Short Course Notes, 17.Google Scholar
London, D. (1986) Magmatic-hydrothermal transition in the Tanco rare-element pegmatite: evidence from fluid inclusions and phase-equilibrium experiments. American Mineralogist, 71, 376–395.Google Scholar
London, D. (1992) The application of experimental petrology to the genesis and crystallization of granitic pegmatites. The Canadian Mineralogist, 30, 499–540.Google Scholar
London, D. (2008) Pegmatites. Mineralogical Association of Canada, Special Publication 10. 368 pp.Google Scholar
Luan, S.W., Chen, S.D., Zhang, Z.L., Fan, L.M., Liu, Y.X., Fang, Y.K., Wang, Z.H., Tian, H.X., Zhang, R.B. (The seventh research room of Chengdu College of Geology) (1985) Study on Mineralogy, Geochemistry and Deposit of Rare metal Granitic Pegmatites in the East Qinling, China. Research report unpublished [in Chinese].Google Scholar
Lumpkin, G.R., Chakoumakos, B.C. and Ewing, R.C. (1986) Mineralogy and radiation effects of microlite from the Harding pegmatite, Taos County, New Mexico. American Mineralogist, 71, 569–588.Google Scholar
Mandarino, J.A. (1981) The Gladstone-Dale relationship: Part IV, the compatibility concept and its applications. The Canadian Mineralogist, 19, 441–450.Google Scholar
Reider, M., Cavazzini, G. and D'yakonov, Y.D. (1998) Nomenclature of the micas. The Canadian Mineralogist, 36, 905–912.Google Scholar
Shen, G.F. (1984) Esuiite (greisen-porphyry), anew igneous rock. Chinese Science Bulletin, 29(11), 1510–1513.Google Scholar
Shen, G.F. and Lu, B.X. (2000) The Petrogenesis and Mineralization of the Cenozoic Intrusive Rocks in the Nujiang-Lancangjiang-Jinshajiang Area, Southwestern China. Geological Press, Beijing [in Chinese with English abstract], pp. 18-36.Google Scholar
Smith, D.G.W and Nickel, E.H. (2007) A system of codification for unnamed minerals: report of the SUM IMA CNMNC. The Canadian Mineralogist, 45, 983–1055.CrossRefGoogle Scholar
Thomas, R., Forster, H., Rickers, K. and Webster, J.D. (2005) Formation of extremely F-rich hydrous melt fractions and hydrothermal fluids during differenti-ation of highly evolved Tin granite magmas: a melt/ fluid-inclusion study. Contributions to Mineralogy and Petrology, 148, 582–601.CrossRefGoogle Scholar
Thomas, R., Webster, J.D. and Davidson, P. (2006) Understanding pegmatite formation: the melt and fluid inclusions approach. Pp. 189–210 in: Melt Inclusions in Plutonic Rocks (Webster, J.D., editor). Mineral. Association of Canada, Short Course Notes, 36.Google Scholar
Trufalova, L.G. and Gluk, D.S. (1986) The Forming Conditions of Lithium Minerals. Nauka Press Novosibirsk, Russia. 149 pp. [in Russian].Google Scholar
Veksler, I.V. and Thomas, R. (2002) An experimental study of B-, P-and F-rich synthetic granite pegmatite at 0.1 and 0.2 Gpa. Contributions to Mineralogy and Petrology, 143, 673–683.CrossRefGoogle Scholar
Wang, L.K. and Huang, Z.L. (2000) Liquation and the Experiments of Li-F Granite. Scientific Press, Beijing, 280 pp. [in Chinese].Google Scholar
Wang, X.J. (1975) The primary study on Nb-Ta minerals in a pegmatite, Xinjiang. Pp. 145–161 in: The Treatise Collections of the National Meeting about Rare-element Geology (I). Scientific Press, Beijing [in Chinese].Google Scholar
Webster, J.D., Thomas, R., Rhede, D., Forster, H-J. and Seltmann, R. (1997) Melt inclusions in quartz from an evolved peraluminous pegmatite: geochemical evidence for strong tin enrichment in fluorine-rich and phosphorous-rich residual liquids. Geochimica et Cosmochimica Acta, 61, 2589–2604.CrossRefGoogle Scholar
Xiong, X.L. (1995) The Experimental Study on Phase Relationship of the Granite-Albite-HF System and Origin of Topaz-Bearing Granitoid Rocks. PhD thesis, Nanjing University, Nanjing, China [in Chinese].Google Scholar
Zhang, Z.L. (1984) Slivery white Cs-rich lepidolite from a pegmatite located in the eastern slope of Qinling. Journal of Chengdu College of Geology, 11(1), 31–35 [in Chinese].Google Scholar
Zhang, Y.M. (1974) Metasomatism and characteristics of Ta-Nb metallization of granitic pegmatites in a mining area, Henan Province. Pp. 218–228 in: The Treatise Collections of the National Meeting about Rare-element Geology (II). Scientific Press, Beijing [in Chinese].Google Scholar
Zhao, J.S., Zhao, B. and Rao, B. (1997) Experimental study on partition behaviour of Ta, Nb and W between different phases in the processes of crystallization differentiation of albite granitic magma. Chinese Science Bulletin, 44(16), 1372–1377.CrossRefGoogle Scholar