Geochemical evolution of tourmaline in the Darasun gold district, Transbaikal region, Russia: evidence from chemical and boron isotopic compositions

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• 作者：Ivan A. Baksheev ; Vsevolod Yu. Prokofiev ; Robert B. Trumbull…
• 关键词：Tourmaline ; Composition ; Boron isotopes ; Darasun gold district ; Russia
• 刊名：Mineralium Deposita
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：50
• 期：1
• 页码：125-138
• 全文大小：2,547 KB
• 参考文献：1. Baksheev IA, Prokof’ev VY, Yapaskurt VO, Vigasina MF, Zorina LD, Solov’ev VN (2011) Ferric-iron-rich tourmaline from the Darasun gold deposit, Transbaikalia, Russia. Can Mineral 49:263-76 CrossRef
  2. Baksheev IA, Prokof’ev VY, Zaraisky GP, Chitalin AF, Yapaskurt VO, Nikolaev YN, Tikhomirov PL, Nagornaya EV, Rogacheva LI, Gorelikova NV, Kononov OV (2012) Tourmaline as a prospecting guide for the porphyry-style deposits. Eur J Mineral 24:957-79 CrossRef
  3. Chernyshev IV, Prof'ev VY, Bortnikov NS, Chugaev AV, Gol'tsman YV, Lebedev VA, Larionova YO, Zorina LD (2014) Age of porphyry granodiorite and berezite of the Darasun goldfield, Eastern Transbaikal region, Russia. Geo Ore Dep 56:3-2
  4. Dutrow BL, Henry DJ (2000) Complexly zoned fibrous tourmaline, Cruzeiro mine, Minas Gerais, Brazil: a record of evolving magmatic and hydrothermal fluids. Can Mineral 38:131-43 CrossRef
  5. Dyar MD, Wiedenbeck M, Robertson D, Cross LR, Delany JS, Ferrguson K, Francis CA, Grew S, Guidotti CV, Hervig RL, Hughes JM, Husler J, Leeman WP, McGuire A, Rhede D, Rothe H, Paul RL, Richards I, Yates M (2001) Reference minerals for microanalyses of light elements. Geostand Newslett 25:441-63 CrossRef
  6. Gonfiantini R, Tonarini S, Gr?ning M, Adorni-Braccesi A, Al-Ammar AS, Astner M, B?chler S, Barnes RM, Basset RL, Cocherie A, Deyhle A, Dini A, Ferrara G, Gaillardet J, Grimm J, Guerrot C, Kr?henbühl U, Layne L, Lemarchand D, Meixner A, Northington DJ, Pennisi M, Reitznerová E, Rodushkin I, Sugiura N, Surberg R, Tonn S, Wieddenbeck M, Wunderli S, Xiao Y-K, Zack T (2003) Intercomparison of boron isotope and concentration measurements. II. Evaluation of results. Geostand Newslett 27:41-7 CrossRef
  7. Henry DJ, Dutrow BL (2012) Tourmaline at diagenetic to low-grade metamorphic conditions: its petrologic applicability. Lithos 154:16-2 CrossRef
  8. Henry DJ, Kirkland BL, Kirkland DW (1999) Sector-zoned tourmaline from the cap rock of a salt dome. Eur J Mineral 11:263-80 CrossRef
  9. Henry DJ, Novák M, Hawthorne FC, Ertl A, Dutrow BL, Uher P, Pezzotta F (2011) Nomenclature of the tourmaline-supergroup minerals. Am Mineral 96:895-13 CrossRef
  10. Hoefs J (2009) Stable isotope geochemistry, 6th edn. Springer, Berlin-Heildelberg, 285?pp
  11. Jarozewich E (2002) Smithsonian microbeam standards. J Res Natl Inst Stand Technol 107:681-85 CrossRef
  12. Jiang S-Y, Palmer MR, Slack JF, Shaw DR (1999) Boron isotope systematics of tourmaline formation in the Sullivan Pb–Zn–Ag deposit, British Columbia, Canada. Chem Geol 158:131-44 CrossRef
  13. Kazimirovsky ME, Plyusnin GS, Smirnov VN, Fefelov NN (1992) Geochemical features and isotopic age of the rocks from the core of the Darasun tectonomagmatic structure. Russ Geol Geophys 33:35-0 (in Russian)
  14. Kazimirovsky ME, Zorina LD, Kulikova ZI (1993) The evolution of Paleozoic ultramafic and mafic magmatism of the Darasun ore district. Otechestv Geol 9:54-0 (in Russian)
  15. Leeman WP, Tonarini S (2001) Boron isotopic analysis of proposed borosilicate mineral reference samples. Geostand Newslett 25:399-03 CrossRef
  16. Liebscher A, Meixner A, Romer RL, Heinrich W (2005) Liquid-vapor fractionation of boron and boron isotopes: experimental calibration at 400?°C/23?MPa to 450?°C/42?MPa. Geochim Cosmochim Acta 69:5693-704 CrossRef
  17. Lyakhov YV (1975) Temperature zonation in the Darasun deposit. Geol Rudn Mestorozhd 17:28-6 (in Russian)
  18. Marschall HR, Jiang S
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1866

文摘

The Darasun gold district, Transbaikal region, eastern Russia comprises three deposits: Teremkyn, Talatui, and Darasun, where gold-bearing quartz veins are hosted in metagabbro and granitoids. Tourmaline is a common gangue mineral in these deposits and a useful indicator of fluid source. The tourmaline compositions are oxy-dravite–povondraite, dravite, and schorl. We report here in situ B-isotope analyses by secondary ion mass spectrometry (SIMS) on tourmaline from veins in metagabbro and K-rich granodiorite, as well as from a breccia pipe at the margin of granodiorite porphyry. The B-isotope composition of tourmalines from the Darasun gold district as a whole covers a very wide range from ?5.7 to +11.2?- with distinctive differences among the three deposits. The δ11B values in the Teremkyn tourmalines are the most diverse, from ?5.7 to +2.5?- Tourmaline core compositions yield an inferred δ11B value of the initial fluid of ca. ?2?- suggesting granitic rocks as the B source, whereas the heavier rims and late-stage grains reflect Rayleigh fractionation. The δ11B values of tourmaline from Talatuiare ?.2 to ?.9?- Taking into account fluid inclusion temperatures from vein quartz (ca. 400?°C), the inferred δ11B value of fluid is heavy (?.5 to +2.2?- suggesting a B source from the host metagabbro. At the Darasun deposit, tourmaline from the breccia pipe is isotopically uniform (δ11 B ? to ??- and suggested to have precipitated from a 10B-depleted, residual fluid derived from granitic rocks. The Darasun vein-hosted tourmalines I and II (δ11B from ?.4 to +1.5?- may have crystallized from strongly fractionated residual granitic fluid although mixing with heavy boron from the metagabbro rocks probably occurred as well; the boron isotopic composition of tourmaline III (?1.2?- is attributed to a less-fractionated fluid, possibly a recharge from the same source.