Discovery and geological significance of new mineral tantalaeschynite-(Ce)
ZHU Zeying1, WANG Denghong1, YU Hong1,2, CHEN Zhenyu1, LI Yike1, LI Jiankang1, REN Jianguo3
1. Key Laboratory of Metallogeny and Mineral Resource Assessment, Ministry of Land and Resources, Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. China University of Geosciences (Beijing), Beijing 100083, China; 3. Jiangxi Ganfeng Lithium Group Co., LTD., Jiangxi Xinyu 338004, China
Abstract：Rare earth elements and rare metals are widely used in the emerging industries and national defense science and technology areas. And they are also regarded as the important key metals for the country and their prospecting is imminent. Recently, new mineral tantalaechynite-(Ce) has been discovered in Huangshan granite pegmatite around Lingshan complex massif in Shangrao of Jiangxi Province, and it has been approved by International Mineralogical Association (IMA), which not only enriches the aeschynite group minerals, but also provides a new direction for rare metal prospecting. Tantalaeschynite-(Ce) occurs in Huangshan tantalumrich pegmatite in the form of acicular or bundle aggregates, and intergrows with feldspar, quartz, fluorites. The composition is extremely enriched in tantalum, titanium and cerium, and the ideal formula is Ce(TiTa)O6. The structure belongs to the orthorhombic system, and it is composed of cerium oxygen polyhedron and titanium/tantalum oxygen coctahedron. The tantalaeschynite-(Ce) is formed in highly evolved granite pegmatite, indicating that the ore-forming environment is extremely rich in tantalum. Compared with the surrounding columbites, the sudden increase of tantalum content in tantalaeschynite-(Ce) cannot be simply explained by magmatic crystallization differentiation. The existence of boundary layer in pegmatite was put forward in the pegmatite zone-refining model, and this layer is enriched in sodium, fluorine, chlorine and other volatile components (also called fluxes). The boundary layer crystallization results in abrupt change of mineral composition, and incompatible elements are enrich in large quantities, after the exhaustion of melt component, and a large number of incompatible components are continuously accumulated and abundant. The boundary layer of highly differentiated granite pegmatite is characterized by the enrichment of volatile minerals such as albitite and fluorite, which is a vital indication for rare metal prospecting. Lingshan complex massif in Shangrao of Jiangxi Province has good potential of rare metal resources and this reasearch is of great significance for regional rare metal prospecting.
[1] 王登红. 关键矿产的研究意义、矿种厘定、资源属性、找矿进展、存在问题及主攻方向[J].地质学报,2019,93(6):1189-1209. Wang D H.Study on critical mineral resources:significance of research,determination of types,attributes of resources,progress of prospecting,problems of utilization,and direction of exploita-tion[J].Acta Geologica Sinica,2019,93(6):1189-1209. [2] 邓攀,陈玉明,叶锦华,等.全球铌钽资源分布概况及产业发展形势分析[J].中国矿业,2019,28(4):63-68. Deng P,Chen Y M,Ye J H,et al.Study on the resource distribution and industry development of global niobium and tantalum[J].China Mining Magazine,2019,28(4):63-68. [3] 曹飞,杨卉芃,张亮,等.全球钽铌矿产资源开发利用现状及趋势[J].矿产保护与利用,2019,39(5):56-67,89. Cao F,Yang H P,Zhang L,et al.Current situation and trend analysis of global tantalum and niobium mineral resources[J].Conservation and Utilization of Mineral Resources,2019,39(5):56-67,89. [4] 李建康,李鹏,王登红,等.中国铌钽矿成矿规律[J].科学通报,2019,64(15):1545-1566. Li J K,Li P,Wang D H,et al.A review of niobium and tantalum metallogenic regularity in China[J].Chinese Science Bulletin,2019,64(15):1545-1566. [5] 周旻,曾晓建,陈正钱.江西葛源稀有金属矿床铌钽赋存状态[J].江西有色金属,2006,20(4):1-5. Zhou M,Zeng X J,Chen Z Q.On the occurrence states of the element Nb and Ta in the superlarge Geyuan rare metal deposit in Jiangxi Province[J].Jiangxi Nonferrous Metals,2006,20(4):1-5. [6] 毛景文,陈懋弘,袁顺达,等.华南地区钦杭成矿带地质特征和矿床时空分布规律[J].地质学报,2011,85(5):636-658. Mao J W,Chen M H,Yuan S D,et al.Geological characteristics of the Qinhang (or Shihang) metallogenic belt in South China and spatial-temporal distribution regularity of mineral deposits[J].Acta Geologica Sinica,2011,85(5):636-658. [7] 黄定堂. 灵山岩体演化特征及其与稀有金属的成矿关系[J].地质与勘探,2003,39(4):35-40. Huang D T.Evolving characteristics and related rare-metal metallogenesis of Lingshan rock body[J].Geology and Prospecting,2003,39(4):35-40. [8] Xiang Y X,Yang J H,Chen J Y,et al.Petrogenesis of Lingshan highly fractionated granites in the Southeast China:implication for Nb-Ta mineralization[J].Ore Geology Reviews,2017,89:495-525. [9] 孙涛. 新编华南花岗岩分布图及其说明[J].地质通报,2006,25(3):332-335. Sun T.A new map showing the distribution of granites in South China and its explanatory notes[J].Geological Bulletin of China,2006,25(3):332-335. [10] 章平,田邦生.赣东北灵山复式岩体特征及其成矿作用初探[J].世界核地质科学,2005,22(1):31-38. Zhang P,Tian B S.Primary discussion on the characteristics and metallogenesis of Lingshan composite massif in northeastern Jiangxi Province[J].World Nuclear Geoscience,2005,22(1):31-38. [11] 刘友华,李康东,涂金飞.江西葛源黄山铌(钽)矿床地质特征及成因分析[J].资源调查与环境,2011,32(4):291-298. Liu Y H,Li K D,Tu J F.Geological characteristics and genesis of Huangshan niobium (tantalum) deposit in Geyuan,Jiangxi province[J].Resources Survey & Environment,2011,32(4):291-298. [12] Zhu Z Y,Wang R C,Marignac C,et al.A new style of rare metal granite with Nb-rich mica:the Early Cretaceous Huangshan rare-metal granite suite,northeast Jiangxi Province,southeast China[J].American Mineralogist,2018,103(10):1530-1544. [13] Zhu Z Y,Wang R C,Marignac C,et al.Petrogenesis of Nb-(Ta) aplo-pegmatites and fine-grained granites from the Early Cretaceous Huangshan rare-metal granite suite,northeast Jiangxi Province,southeast China[J].Lithos,2019,346-347:105150. [14] Thorogood G J,Avdeev M,Kennedy B J,Structural studies of the aeschynite-euxenite transformation in the series Ln(TiTa)O6Ln= Lanthanide[J].Solid State Sciences,2010,12(7):1263-1269. [15] Bermanec V,Tomašić N,Kniewald G,et al.Nioboaeschynite-(Y),a new member of the aeschynite group from the Bear Lake diggings,Haliburton County,Ontario,Canada[J].The Canadian Mineralogist,2008,46(2):395-402. [16] London D.Granitic pegmatites:an assessment of current concepts and directions for the future[J].Lithos,2005,80(1-4):281-303. [17] 李鹏,李建康,裴荣富,等.幕阜山复式花岗岩体多期次演化与白垩纪稀有金属成矿高峰:年代学依据[J].地球科学,2017,42(10):1684-1696. Li P,Li J K,Pei R F,et al.Multistage magmatic evolution and Cretaceous peak metallogenic epochs of Mufushan composite granite mass:constrains from geochronological evidence[J].Earth Science,2017,42(10):1684-1696. [18] 张辉,吕正航,唐勇.新疆阿尔泰造山带中伟晶岩型稀有金属矿床成矿规律、找矿模型及其找矿方向[J].矿床地质,2019,38(4):792-814. Zhang H,Lü Z H,Tang Y.Metallogeny and prospecting model as well as prospecting direction of pegmatite-type rare metal ore deposits in Altay orogenic belt,Xinjiang[J].Mineral Deposits,2019,38(4):792-814. [19] 冉子龙,李艳军.伟晶岩型稀有金属矿床成矿作用研究进展[J].地质科技通报,2021,40(2):13-23. Ran Z L,Li Y J.Research advances on rare metal pegmatite deposits[J].Bulletin of Geological Science and Technology,2021,40(2):13-23. [20] 李建康,李鹏,严清高,等.中国花岗伟晶岩的研究历程及发展态势[J].地质学报,2021,95(10):2996-3016. Li J K,Li P,Yan Q G,et al.History of granitic pegmatite research in China[J].Acta Geologica Sinica,2021,95(10):2996-3016. [21] Sowerby J R,Keppler H.The effect of fluorine,boron and excess sodium on the critical curve in the albite-H2O system[J].Contributions to Mineralogy and Petrology,2002,143(1):32-37. [22] London D,Morgan VI G B.Experimental crystallization of the Macusani Obsidian,with applications to lithium-rich Granitic Pegmatites[J].Journal of Petrology,2017,58(5):1005-1030. [23] London D.Ore-forming processes within granitic pegmatites[J].Ore Geology Reviews,2018,101:349-383. [24] London D.Melt boundary layers and the growth of pegmatite textures[J].The Canadian Mineralogist,1999,37:826-827. [25] Thomas R,Webster J D,Heinrich W.Melt inclusions in pegmatite quartz:complete miscibility between silicate melts and hydrous fluids at low pressure[J].Contributions to Mineralogy and Petrology,2000,139(4):394-401. [26] 李建康. 川西典型伟晶岩型矿床的形成机理及其大陆动力学背景[D].北京:中国地质大学(北京),2006. Li J K.Mineralizing Mechanism and Continental Geodynamics of Typical Pegmatite Deposits in Western Sichuan,China[D].Beijing:China University of Geosciences (Beijing),2006. [27] Veksler I V,Thomas R.An experimental study of B-,P- and F-rich synthetic granite pegmatite at 0.1 and 0.2 GPa[J].Contributions to Mineralogy and Petrology,2002,143(6):673-683.
2024, Vol. 11 
