Tourmaline Geochemistry as Genetic Evolution and Metallogenic Potential Indicators of Pegmatites: A Case Study from the Tugeman Be-Li Deposit, Middle Altun

Abstract

Tourmaline is a common borosilicate mineral in granite and pegmatite, and it is also an important carrier to record the physicochemical evolution information of magmas. However, the genetic relationship between pegmatite-type rare metal mineralization potential and tourmalinebearing pegmatites is not clear, and the tourmaline geochemical indication of the mineralization type of rare metals needs to be supplemented. In the middle Altun region, extensive tourmalinebearing pegmatite dykes are prevalent within and surrounding the Tugeman complex. In this paper, the petrology and geochemical characteristics of tourmaline within the pegmatite of the Tugeman Be-Li deposit have been comprehensively analyzed. The research delves into the genetic evolution and metallogenic potential of the pegmatite, emphasizing the indicative role of tourmaline geochemistry in discerning mineralization types in the Tugeman Be-Li deposit. Major and trace element analysis of tourmaline reveals varying contents of FeO (9.37 wt.%–17.10 wt.%), Al₂O₃ (28.6 wt.%–35.2 wt.%), and MgO (0.13 wt.%–2.47 wt.%) in the Tugeman Be-Li pegmatite. Li, Zn, and Sn contents range from 204 ppm to 1 590 ppm, 1 143 ppm to 4 089 ppm, and 74.1 ppm to 396 ppm, respectively. The tourmaline analyzed in this study is of magmatic origin and belongs to the schorl series, exhibits substitution relationships, including (Na, Fe²⁺)(^X□, Al)₋₁, (Fe²⁺, Fe³⁺)(Mg, Al)₋₁, (Al, ^X□)(R²⁺, Na)₋₁, (Na, Mg)(^X□ Al)₋₁ and ^X□NaR²⁺₋₁. The trace element data of tourmaline show that lithium has four enrichment stages in different mineral crystallization phases. Notably, the tendency of tourmaline in the Tugeman Be-Li pegmatite to evolve towards elbaite implies a magmatic evolution sequence from low to high, transitioning through microcline-albite pegmatite, muscovite-microcline-albite pegmatite, albite pegmatite, and microcline pegmatite. Furthermore, we also propose that the Sc content in schorl can serve as an indicator of pegmatite mineralization type, and the Tugeman Be-Li pegmatite has evolved to a beryllium-rich stage and has certain lithium enrichment potential.

Keywords

Tugeman / granitic pegmatite / rare metal mineralization / tourmaline / geochemistry

References

[1] Cao Y T, Liu L, Wang C, et al. P-T path of Early Paleozoic Pelitic High-Pressure Granulite from Danshuiquan Area in Altyn Tagh. Acta Petrologica Sinica, 2009, 25: 2260-2270(in Chinese with English Abstract)

[2] Cao Y T, Liu L, Wang C, et al. Timing and Nature of the Partial Melting Processes during the Exhumation of the Garnet-Bearing Biotite Gneiss in the Southern Altyn Tagh HP/UHP Belt, Western China. Journal of Asian Earth Sciences, 2019, 170: 274-293.

[3] Cao Y T, Liu L, Wang C, et al. Multi-Stage Metamorphism of the UHP Pelitic Gneiss from the Southern Altyn Tagh HP/UHP Belt, Western China: Petrological and Geochronological Evidence. Journal of Earth Science, 2019, 303603620.

[4] Chakraborty T, Upadhyay D. The Geochemical Differentiation of S-Type Pegmatites: Constraints from Major-Trace Element and Li-B Isotopic Composition of Muscovite and Tourmaline. Contributions to Mineralogy and Petrology, 2020, 175760.

[5] Chen J Z, Zhang H, Tang Y, et al. Lithium Mineralization during Evolution of a Magmatic-Hydrothermal System: Mineralogical Evidence from Li-Mineralized Pegmatites in Altai, NW China. Ore Geology Reviews, 2022, 149: 105058.

[6] Duchoslav M, Marks M A W, Drost K, et al. Changes in Tourmaline Composition during Magmatic and Hydrothermal Processes Leading to Tin-Ore Deposition: The Cornubian Batholith, SW England. Ore Geology Reviews, 2017, 83: 215-234.

[7] Dutrow B L, Henry D J. Tourmaline: A Geologic DVD. Elements, 2011, 75301306.

[8] Ertl A, Kolitsch U, Dyar M D, et al. Limitations of Fe²⁺ and Mn²⁺ Site Occupancy in Tourmaline: Evidence from Fe²⁺- and Mn²⁺-Rich Tourmaline. American Mineralogist, 2012, 978/914021416.

[9] Feng Y G, Liang T, Wang M X, et al. Geochemistry of Tourmaline from Granitic Pegmatites in East Qinling and Its Implications for Mineralization. Acta Petrologica Sinica, 2022, 382428444. in Chinese with English Abstract)

[10] Gadas P, Novak M, Stanek J, et al. Compositional Evolution of Zoned Tourmaline Crystals from Pockets in Common Pegmatites of the Moldanubian Zone, Czech Republic. The Canadian Mineralogist, 2012, 504895912.

[11] Gao Y B, Zhao X M, Bagas L, et al. Newly Discovered Ordovician Li-Be Deposits at Tugeman in the Altyn-Tagh Orogen, NW China. Ore Geology Reviews, 2021, 139: 104515.

[12] Griffin W L, Powell W J, Pearson N J, et al. Appendix A2: Glitter: Data Reduction Software for Laser Ablation ICP-MS. Laser Ablation ICP-MS in the Earth Sciences: Current Practices and Outstanding Issues, 2008308311

[13] Han J S, Chen H Y, Xu H J, et al. Identifying Xenocrystic Tourmaline in Himalayan Leucogranites. American Mineralogist, 2023, 108712891297.

[14] Hawthorne F C, Černý P. The Alkali-Metal Positions in Cs-Li Beryl. The Canadian Mineralogist, 1977, 15: 414-421

[15] Hawthorne F C, Henry D J. Classification of the Minerals of the Tourmaline Group. European Journal of Mineralogy, 1999, 112201216.

[16] Henry D J, Dutrow B L. Metamorphic Tourmaline and Its Petrologic Applications. Reviews in Mineralogy and Geochemistry, 1996, 331503557

[17] Henry D J, Guidotti C V. Tourmaline as a Petrogenetic Indicator Mineral: An Example from the Staurolite-Grade Metapelites of NW Maine. American Mineralogist, 1985, 701115

[18] Henry D J, Novak M, Hawthorne F C, et al. Nomenclature of the Tourmaline-Supergroup Minerals. American Mineralogist, 2011, 965/6895913.

[19] Hong T, Zhai M G, Xu X W, et al. Tourmaline and Quartz in the Igneous and Metamorphic Rocks of the Tashisayi Granitic Batholith, Altyn Tagh, Northwestern China: Geochemical Variability Constraints on Metallogenesis. Lithos, 2021, 400/401: 106358.

[20] Hong W, Cooke D R, Zhang L J, et al. Tourmaline-Rich Features in the Heemskirk and Pieman Heads Granites from Western Tasmania, Australia: Characteristics, Origins, and Implications for Tin Mineralization. American Mineralogist, 2017, 1024876899.

[21] Huang T, Fu X F, Ge L Q, et al. The Genesis of Giant Lithium Pegmatite Veins in Jiajika, Sichuan, China: Insights from Geophysical, Geochemical as Well as Structural Geology Approach. Ore Geology Reviews, 2020, 124: 103557.

[22] Jiang S Y, Radvanec M, Nakamura E, et al. Chemical and Boron Isotopic Variations of Tourmaline in the Hnilec Granite-Related Hydrothermal System, Slovakia: Constraints on Magmatic and Metamorphic Fluid Evolution. Lithos, 2008, 1061/2111.

[23] Jolliff B L, Papike J J, Laul J C. Mineral Recorders of Pegmatite Internal Evolution: REE Contents of Tourmaline from the Bob Ingersoll Pegmatite, South Dakota. Geochimica et Cosmochimica Acta, 1987, 51822252232.

[24] Kang L, Xiao P X, Gao X F, et al. Early Paleozoic Magmatism and Collision Orogenic Process of the South Altyn. Acta Geologica Sinica, 2016, 90: 2527-2550(in Chinese with English Abstract)

[25] Keller P, Roda Robles E, Pesquera Pérez A, et al. Chemistry, Paragenesis and Significance of Tourmaline in Pegmatites of the Southern Tin Belt, Central Namibia. Chemical Geology, 1999, 1583/4203225.

[26] Launay G, Sizaret S, Guillou-Frottier L, et al. Deciphering Fluid Flow at the Magmatic-Hydrothermal Transition: A Case Study from the World-Class Panasqueira W-Sn- (Cu) Ore Deposit (Portugal). Earth and Planetary Science Letters, 2018, 499: 1-12.

[27] Li H, Hong T, Liu S K, et al. Characteristics of Early Paleozoic Granite-Pegmatite and Associated Lithium-Beryllium Mineralization in the Tugeman Area, Altun Orogenic System, Northwestern China. Ore Geology Reviews, 2023, 160: 105603.

[28] Li H, Hong T, Yang Z Q, et al. Comparative Studying on Zircon, Cassiterite and Coltan U-Pb Dating and ⁴⁰Ar/³⁹Ar Dating of Muscovite Rare-Metal Granitic Pegmatites—A Case Study of the Northern Tugeman Lithium-Beryllium Deposit in the Middle of Altyn Tagh. Acta Petrologica Sinica, 2020, 36: 2869-2892. in Chinese with English Abstract)

[29] Li H, Hong T, Yang Z Q, et al. Multi-Stage Magmatism-Mineralization and Tectonic Setting of the North Tugeman Granitic Pegmatite Lithium-Beryllium Deposit in the Middle of Altyn Tagh. Acta Petrologica Sinica, 2022, 38: 3085-3103. in Chinese with English Abstract)

[30] Li J K, Zou T R, Liu X F, et al. The Metallogenetic Regularities of Lithium Deposits in China. Acta Geologica Sinica (English Edition), 2015, 892652670.

[31] Li L G, Wang L X, Zhu Y X, et al. Metallogenic Age and Process of Rare Metal-Bearing Pegmatites from the Northern Margin of Mufushan Complex, South China. Earth Science, 2023, 48932213244

[32] Li X, Liu L, Liao X Y, et al. Metamorphic Evolution of Garnet Amphibolite from the Yaganbuyang Area in the South Altyn Orogen, West China: Insights from Phase Equilibria Modeling and Geochronology. Journal of Earth Science, 2023, 343640657.

[33] Lima J L, Scholz R, Lana C, et al. Mica and Tourmaline Geochemistry of Pegmatites from Conselheiro Pena Pegmatite District, Minas Gerais, Brazil: Implications for Pegmatite Genesis and Economic Potential. Geochemical Journal, 2019, 532151170.

[34] Liu C H, Wu C L, Gao Y H, et al. Age, Composition, and Tectonic Significance of Palaeozoic Granites in the Altyn Orogenic Belt, China. International Geology Review, 2015, 582131154.

[35] Liu L, Cao Y T, Chen D L, et al. New Progresses on the HP-UHP Metamorphism in the South Altyn Tagh and the North Qinling. Chinese Science Bulletin, 2013, 582221132123

[36] Liu L, Wang C, Cao Y T, et al. Geochronology of Multi-Stage Metamorphic Events: Constraints on Episodic Zircon Growth from the UHP Eclogite in the South Altyn, NW China. Lithos, 2012, 136/137/138/139: 10-26.

[37] Liu Y S, Yu H F, Xin H T, et al. Tectonic Units Division and Precambrian Significant Geological Events in Altyn Tagh Mountain, China. Geological Bulletin of China, 2009, 28: 1430-1438(in Chinese with English Abstract)

[38] London D. Pegmatites. The Canadian Mineralogist. Special Publication, 2008, 10: 1-347

[39] Lu S N, Li H K, Zhang C L, et al. Geological and Geochronological Evidence for the Precambrian Evolution of the Tarim Craton and Surrounding Continental Fragments. Precambrian Research, 2008, 1601/294107.

[40] Lv Z H, Zhang H, Tang Y, et al. Petrogenesis of Syn-Orogenic Rare Metal Pegmatites in the Chinese Altai: Evidences from Geology, Mineralogy, Zircon U-Pb Age and Hf Isotope. Ore Geology Reviews, 2018, 95: 161-181.

[41] Ma Y C, Xu X W, Hong T, et al. Multiphase Evolution of a Li-Pegmatite Field from the Tashisayi Area, Altyn Tagh, NW China: Insights from a Petrological, Geochemical, and Geochronological Study. Mineralium Deposita, 2024, 595863884.

[42] Maner J LIVLondon D, Icenhower J P. Enrichment of Manganese to Spessartine Saturation in Granite-Pegmatite Systems. American Mineralogist, 2019, 1041116251637.

[43] Maner J LIVLondon D. The Boron Isotopic Evolution of the Little Three Pegmatites, Ramona, CA. Chemical Geology, 2017, 460: 70-83.

[44] Maneta V, Baker D R, Minarik W. Evidence for Lithium-Aluminosilicate Supersaturation of Pegmatite-Forming Melts. Contributions to Mineralogy and Petrology, 2015, 17014.

[45] Marks M A W, Marschall H R, Schühle P, et al. Trace Element Systematics of Tourmaline in Pegmatitic and Hydrothermal Systems from the Variscan Schwarzwald (Germany): The Importance of Major Element Composition, Sector Zoning, and Fluid or Melt Composition. Chemical Geology, 2013, 344: 73-90.

[46] Marschall H R, Jiang S Y. Tourmaline Isotopes: No Element Left Behind. Elements, 2011, 75313319.

[47] Meng L T, Chen B L, Wang Y, et al. Timing of Early Paleozoic Tectonic Regime Transition in North Altun: Evidence from Granite. Geotectonica et Metallogenia, 2016, 40: 295-307(in Chinese with English Abstract)

[48] Möller P, Muecke G K. Significance of Europium Anomalies in Silicate Melts and Crystal-Melt Equilibria: A Re-Evaluation. Contributions to Mineralogy and Petrology, 1984, 873242250.

[49] No. 3 Geological PartyXinjiang Bureau of Geology and Mineral Exploration and DevelopmentInvestigation and Evaluation Report of Pegmatite Rare Metal Deposit, Andalusite Deposit and Graphite Ore in Tugeman Area, Ruoqiang County, Xinjiang, China, 2019, Xinjiang: Xinjiang Bureau of Geology and Mineral Exploration and Development(in Chinese, unpublished)

[50] Novak M, Skoda R, Filip J, et al. Compositional Trends in Tourmaline from Intragranitic NYF Pegmatites of the Trebic Pluton, Czech Republic: An Electron Microprobe, Mossbauer and LA-ICP-MS Study. The Canadian Mineralogist, 2011, 491359380.

[51] Rao C, Wang R C, Zhang A C, et al. The Corundum+ Tourmaline Nodules Related to Hydrothermal Alteration of Spodumene in the Nanping No. 31 Pegmatite Dyke, Fujian Province, Southeastern China. The Canadian Mineralogist, 2012, 50616231635.

[52] Shen P, Pan H D, Li C H, et al. Newly-Recognized Triassic Highly Fractionated Leucogranite in the Koktokay Deposit (Altai, China): Rare-Metal Fertility and Connection with the No. 3 Pegmatite. Gondwana Research, 2022, 112: 24-51.

[53] Siegel K, Wagner T, Trumbull R B, et al. Stable Isotope (B, H, O) and Mineral-Chemistry Constraints on the Magmatic to Hydrothermal Evolution of the Varuträsk Rare-Element Pegmatite (Northern Sweden). Chemical Geology, 2016, 421: 1-16.

[54] Sun S S, McDonough W F. Saunders A D, Norry M J. Chemical and Isotopic Systematics in Ocean Basalt: Implication for Mantle Composition and Processes. Magmatism in the Ocean Basins, 1989313345

[55] Tindle A G, Breaks F W, Selway J B. Tourmaline in Petalite-Subtype Granitic Pegmatites: Evidence of Fractionation and Contamination from the Pakeagama Lake and Separation Lake Areas of Northwestern Ontario, Canada. The Canadian Mineralogist, 2002, 403753788.

[56] Trumbull R B, Beurlen H, Wiedenbeck M, et al. The Diversity of B-Isotope Variations in Tourmaline from Rare-Element Pegmatites in the Borborema Province of Brazil. Chemical Geology, 2013, 352: 47-62.

[57] Trumbull R B, Codeço M S, Jiang S Y, et al. Boron Isotope Variations in Tourmaline from Hydrothermal Ore Deposits: A Review of Controlling Factors and Insights for Mineralizing Systems. Ore Geology Reviews, 2020, 125: 103682.

[58] van Hinsberg V J, Henry D J, Marschall H R. Tourmaline: An Ideal Indicator of Its Host Environment. The Canadian Mineralogist, 2011, 491116.

[59] Vereshchagin O S, Britvin S N, Wunder B, et al. Ln3+ (Ln3+ = La, Nd, Eu, Yb) Incorporation in Synthetic Tourmaline Analogues: Towards Tourmaline REE Pattern Explanation. Chemical Geology, 2021, 584: 120526.

[60] Wang C, Liu L, Yang W Q, et al. Provenance and Ages of the Altyn Complex in Altyn Tagh: Implications for the Early Neoproterozoic Evolution of Northwestern China. Precambrian Research, 2013, 230: 193-208.

[61] Wang H, Gao H, Zhang X Y, et al. Geology and Geochronology of the Super-Large Bailongshan Li-Rb-(Be) Rare-Metal Pegmatite Deposit, West Kunlun Orogenic Belt, NW China. Lithos, 2020, 360/361: 105449.

[62] Wu C L, Gao Y H, Wu S P, et al. Zircon SHRIMP U-Pb Dating of Granites from the Da Qaidam Area in the North Margin of Qaidam Basin, NW China. Acta Petrologica Sinica, 2007, 23818611875(in Chinese with English Abstract)

[63] Wu S T, Karius V, Schmidt B C, et al. Comparison of Ultrafine Powder Pellet and Flux-Free Fusion Glass for Bulk Analysis of Granitoids by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry. Geostandards and Geoanalytical Research, 2018, 424575591.

[64] Wu S T, Wörner G, Jochum K P, et al. The Preparation and Preliminary Characterisation of Three Synthetic Andesite Reference Glass Materials (ARM-1, ARM-2, ARM-3) for in situ Microanalysis. Geostandards and Geoanalytical Research, 2019, 434567584.

[65] Wu S T, Yang Y H, Jochum K P, et al. Isotopic Compositions (Li-B-Si-O-Mg-Sr-Nd-Hf-Pb) and Fe²⁺/ΣFe Ratios of Three Synthetic Andesite Glass Reference Materials (ARM-1, ARM-2, ARM-3). Geostandards and Geoanalytical Research, 2021, 454719745.

[66] Wu Y, Chen Z L, Chen B L, et al. Geochronological and Geochemical Characteristics of the Deformed Diorite from the North Altyn Brittle-Ductile Shear Zone and Its Constraint on the Early Paleozoic Tectonic Evolution of the North Altyn Tagh. Acta Petrologica Sinica, 2016, 32: 555-570(in Chinese with English Abstract)

[67] Xia Y Q, Tuo M J, Li N, et al. Mineral Characteristics of Mica and Tourmaline and Geological Implication for the Pegmatite-Type Lithium Mineralization, Dahongliutan Area, West Kunlun. Earth Science, 2024, 493922938(in Chinese with English Abstract)

[68] Xiao W Z, Liu C Y, Tan K X, et al. Zircon U-Pb-Hf and Trace Element Signatures Reveal the Petrogenesis of the Jiuyishan Granitic Complex, South China: Implications for W-Sn and Rare Metal Mineralization. Journal of Earth Science, 2025, 36310691089.

[69] Xu X W, Hong T, Li H, et al. Concept of High-Temperature Granite-Pegmatite Li-Be Metallogenic System with a Primary Study in the Middle Altyn-Tagh. Acta Petrologica Sinica, 2020, 36: 3572-3592. in Chinese with English Abstract)

[70] Xu X W, Li H, Shi F P, et al. Metallogenic Characteristics and Prospecting of Granitic Pegmatite-Type Rare Metal Deposits in the Tugeman Area, Middle Part of Altyn Tagh. Acta Petrologica Sinica, 2019, 35: 3303-3316. in Chinese with English Abstract)

[71] Yan Q G, Li J K, Li X J, et al. Source of the Zhawulong Granitic Pegmatite-Type Lithium Deposit in the Songpan-Ganzê Orogenic Belt, Western Sichuan, China: Constrants from Sr-Nd-Hf Isotopes and Petrochemistry. Lithos, 2020, 378/379: 105828.

[72] Yang J S, Shi R D, Wu C L, et al. Petrology and SHRIMP Age of the Hongliugou Ophiolite at Milan, North Altun, at the Margin of the Tibetan Plateau. Acta Petrologica Sinica, 2008, 24: 1567-1584(in Chinese with English Abstract)

[73] Yang S Y, Jiang S Y. Chemical and Boron Isotopic Composition of Tourmaline in the Xiangshan Volcanic-Intrusive Complex, Southeast China: Evidence for Boron Mobilization and Infiltration during Magmatic-Hydrothermal Processes. Chemical Geology, 2012, 312/313: 177-189.

[74] Yang S Y, Jiang S Y, Palmer M R. Chemical and Boron Isotopic Compositions of Tourmaline from the Nyalam Leucogranites, South Tibetan Himalaya: Implication for Their Formation from B-Rich Melt to Hydrothermal Fluids. Chemical Geology, 2015, 419: 102-113.

[75] Yang S Y, Jiang S Y, Zhao K D, et al. Tourmaline as a Recorder of Magmatic-Hydrothermal Evolution: An in situ Major and Trace Element Analysis of Tourmaline from the Qitianling Batholith, South China. Contributions to Mineralogy and Petrology, 2015, 170542.

[76] Yuan J, Cao Y, Tang C H, et al. Geochemical, Boron Isotope Characteristics and Geological Significance of Tourmaline from Tangyin Granitic Pegmatite in Yihuang, Jiangxi Province. Earth Science, 2025, 501144424458(in Chinese with English Abstract)

[77] Zhang A C, Wang R C, Jiang S Y, et al. Chemical and Textural Features of Tourmaline from the Spodumene-Subtype Koktokay No. 3 Pegmatite, Altai, Northwestern China: A Record of Magmatic to Hydrothermal Evolution. The Canadian Mineralogist, 2008, 4614158.

[78] Zhang J X, Mattinson C G, Meng F C, et al. An Early Palaeozoic HP/HT Granulite-Garnet Peridotite Association in the South Altyn Tagh, NW China: P-T History and U-Pb Geochronology. Journal of Metamorphic Geology, 2005, 237491510.

[79] Zhang J X, Yu S Y, Mattinson C G. Early Paleozoic Polyphase Metamorphism in Northern Tibet, China. Gondwana Research, 2017, 41: 267-289.

[80] Zhang S T, Lu J J, Zhang R Q, et al. Tourmaline as an Indicator for Late-Magmatic to Hydrothermal Fluid Evolution of the Neoproterozoic Baotan Tin Deposit, South China. Ore Geology Reviews, 2021, 139: 104504.

[81] Zheng B Q, Chen B, Sun K K, et al. Tourmaline as a Recorder of the Magmatic-Hydrothermal Evolution in the Formation of Pegmatite: In-situ Elemental and Boron Isotopic Compositions of Tourmaline from the Qinghe Pegmatite, Chinese Altay Orogen. Journal of Asian Earth Sciences, 2022, 231: 105224.

[82] Zhu X H, Cao Y T, Liu L, et al. P-T Path and Geochronology of High Pressure Granitic Granulite from Danshuiquan Area in Altyn Tagh. Acta Petrologica Sinica, 2014, 301237173728(in Chinese with English Abstract)

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