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Mineralogy and Petrology

, Volume 95, Issue 3–4, pp 315–326 | Cite as

Garnet Lu–Hf dating of retrograde fluid activity during ultrahigh-pressure metamorphic eclogites exhumation

  • Hao Cheng
  • Eizo Nakamura
  • Zuyi Zhou
Original Paper

Abstract

Previous studies on the atoll-shaped garnets in ultrahigh-pressure (UHP) metamorphic eclogites from the Dabie orogen, east-central China, suggest a fluid-enhanced overgrowth origin at the onset of exhumation. The atoll-garnets bearing eclogite place better constraints on the timing of the retrograde fluid activity and are a straightforward target to gain insight into the isotopic equilibrium and/or disequilibrium during exhumation. Comprehensive textural, chemical and Lu–Hf geochronological analyses on the atoll garnet-bearing eclogite show that the retrograde fluid activity event likely occurred at ca. 221 Ma. The Lu–Hf age of 221.0 ± 2.3 Ma marks the last garnet overgrowth episode during exhumation rather than prograde metamorphism. This somewhat restricted study suggests that dating the prograde-zoning-preserved garnets may bias results towards a particular metamorphic event rather than the prograde timing, as previously thought. The general assumption that larger garnet crystals in metamorphic rocks are older should be made with caution, and it is likely invalid in atoll garnet-bearing metamorphic eclogites because the preliminary garnet cores have been largely consumed. These observations highlight that linking textural and chemical analyses is crucial for interpreting geochronological data.

Keywords

Atoll Isochron Crystal Size Distribution Garnet Growth Continental Subduction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We would like to acknowledge Robert L. King for obtaining the geochronological data. We are very grateful to Katsura Kobayashi and Akira Ishikawa for their help with the ion microprobe analyses. Valuable and educational comments provided by Horst Marschall and two anonymous reviewer were helpful in clarifying this manuscript. This research was in part supported by the NNSFC (40403007, 40572075), Program for Young Excellent Talents in Tongji University, the COE-21 program to Eizo Nakamura and NSF grants EAR-0609856 and EAR-0711326 to Jeffrey D. Vervoort.

References

  1. Ames L, Zhou GZ, Xiong BC (1996) Geochronology and isotopic character of ultrahigh-pressure metamorphism with implications for the collision of the Sino-Korean and Yangtze cratons, central China. Tectonics 15:472–489CrossRefGoogle Scholar
  2. Anczkiewicz R, Szczepański J, Mazur S, Storey C, Crowley Q, Villa IM, Thirlwall MF, Jeffries TE (2007) Lu–Hf geochronology and trace element distribution in garnet: implications for uplift and exhumation of ultra-high pressure granulites in the Sudetes, SW Poland. Lithos 95:363–380CrossRefGoogle Scholar
  3. Barker J, Matthews A, Mattey D, Rowley D, Xue F (1997) Fluid–rock interaction during ultra-high pressure metamorphism, Dabie Shan, China. Geochim Cosmochim Acta 61:1685–1696CrossRefGoogle Scholar
  4. Blichert-Toft J, Frei R (2001) Complex Sm–Nd and Lu–Hf isotope systematics in metamorphic garnets from the Isua supracrustal belt, West Greenland. Geochim Cosmochim Acta 65:3177–3187CrossRefGoogle Scholar
  5. Burton KW, O’Nions RK (1991) High-resolution garnet chronometry and the rates of metamorphic processes. Earth Planet Sci Lett 107:649–671CrossRefGoogle Scholar
  6. Carlson WD (1989) The significance of intergranular diffusion to the mechanisms and kinetics of porphyroblast crystallization. Contrib Mineral Petrol 103:1–24CrossRefGoogle Scholar
  7. Carswell D, O’Brien P, Wilson R (1997) Thermobarometry of phengite-bearing eclogites in the Dabie mountains of central China. J Metamorph Geol 15:239–252CrossRefGoogle Scholar
  8. Cashman KV, Ferry JM (1988) Crystal size distribution (CSD) in rocks and the kinetics and dynamics of crystallization. III. metamorphic crystallization. Contrib Mineral Petrol 99:401–415CrossRefGoogle Scholar
  9. Castelli D, Rolfo F, Compagnoni R (1998) Metamorphic veins with kyanite, zoisite and quartz in the Zhu–Jia–Chong eclogite, Dabie Shan, China. Island Arc 7:159–173CrossRefGoogle Scholar
  10. Chakraborty S (2006) Diffusion modeling as a tool for constraining timescales of evolution of metamorphic rocks. Mineral Petrol 88:7–27CrossRefGoogle Scholar
  11. Chavagnac V, Jahn BM (1996) Coesite-bearing eclogites from the Bixiling complex Dabie mountains, China: Sm–Nd ages, geochemical characteristics and tectonic implications. Chem Geol 133:29–51CrossRefGoogle Scholar
  12. Chen D, Deloule E, Cheng H, Xia Q, Wu Y (2003) The investigation on isoptopic geochronology of low-temperature eclogites from Huang Zhen in the Southern Dabie mountains. Sci. China (D) 33:828–840Google Scholar
  13. Chen RX, Zheng YF, Gong B, Zhao ZF, Gao TS, Chen B, Wu YB (2007) Origin of retrograde fluid in ultrahigh-pressure metamorphic rocks: constraints from mineral hydrogen isotope and water content changes in eclogite–gneiss transitions in the Sulu orogen. Geochim Cosmochim Acta 71:2299–2325CrossRefGoogle Scholar
  14. Cheng H, Nakamura E, Kobayashi K, Zhou Z (2007) Origin of atoll garnets in eclogites and implications for the redistribution of trace elements during slab exhumation in a continental subduction zone. Am Miner 92:119–1129CrossRefGoogle Scholar
  15. Cheng H, King RL, Nakamura E, Vervoort JD, Zhou Z (2008a) Coupled Lu–Hf and Sm–Nd geochronology constrains garnet growth in ultrahigh-pressure eclogites from the Dabie orogen. J Metamorph Geol 26:741–758CrossRefGoogle Scholar
  16. Cheng H, Zhou Z, Nakamura E (2008b) Crystal size distribution and composition of garnets in eclogites from the Dabie orogen, central China. Am Mineral 93:124–133CrossRefGoogle Scholar
  17. Christensen JN, Rosenfeld JL, DePaolo DJ (1989) Rates of tectonometamorphic processes from rubidium and strontium isotopes in garnet. Science 224:1465–1469Google Scholar
  18. Daniel CG, Spear FS (1998) Three-dimensional patterns of garnet nucleation and growth. Geology 26:503–506CrossRefGoogle Scholar
  19. Duchêne S, Blichert-Toft J, Luais B, Télouk P, Lardeaux JM, Albarède F (1997) The Lu–Hf dating of garnets and the ages of the Alpine high-pressure metamorphism. Nature 387:586–589CrossRefGoogle Scholar
  20. Eide L, McWilliams M, Liou JG (1994) 40Ar/39Ar ages constrain exhumation of high and very high pressure metamorphic rocks in eastern central China. Geology 22:601–604CrossRefGoogle Scholar
  21. Franz L, Romer RL, Klemd R, Schmid R, Oberhansli R, Wagner T, Dong S (2001) Eclogite-facies quart vein within metabasites of the Dabie Shan (eastern China): pressure–temperature–time-deformation path, composition of the fluid phase and fluid flow during exhumation of high-pressure rocks. Contrib Mineral Petrol 141:322–346Google Scholar
  22. Fu B, Zheng YF, Wang ZR, Xiao YL, Gong B, Li SG (1999) Oxygen and hydrogen isotope geochemistry of gneisses associated with ultrahigh pressure pressure eclogites at Shuanghe in the Dabie mountains. Contrib Mineral Petrol 134:52–66CrossRefGoogle Scholar
  23. Green TH, Hellman PL (1982) Fe–Mg partitioning between coexisting garnet and phengite at high pressure, and comments on a garnet-phengite geothermometer. Lithos 15:253–266CrossRefGoogle Scholar
  24. Green TH, Blundy JD, Adam J, Yaxley GM (2000) SIMS determination of trace element partition coefficients between garnet, clinopyroxene and hydrous basaltic liquids at 2–7.5 GPa and 1080–1200°C. Lithos 53:165–187CrossRefGoogle Scholar
  25. Gualda GAR, Rivers M (2006) Quantitative 3D petrography using X-ray tomography: application to bishop Tuff pumice clasts. J Volcanol Geotherm Res 154:48–62CrossRefGoogle Scholar
  26. Hacker BR, Ratschbacher L, Webb L, Ireland T, Walker D, Dong S (1998) U/Pb zircon ages constrain the architecture of the ultrahigh-pressure Qinling-Dabie Orogen, China. Earth Planet Sci Lett 161:215–230CrossRefGoogle Scholar
  27. Higgins MD (1994) Determination of crystal morphology and size from bulk measurements on thin sections: Numerical modeling. Am Mineral 79:113–119Google Scholar
  28. Higgins MD (2000) Measurement of crystal size distributions. Am Mineral 85:1105–1116Google Scholar
  29. Hollister LS (1966) Garnet zoning: an interpretation based on the Rayleigh fractionation model. Science 154:1647–1651CrossRefGoogle Scholar
  30. King RL, Bebout GE, Kobayashi K, Nakamura E, van der Klauw SNGC (2004) Ultrahigh-pressure metabasaltic garnets as probes into deep subduction-zone cycling. Geochem Geophys Geosystems 5:Q12J14 doi: 10.1029/2004GC000746 CrossRefGoogle Scholar
  31. Kohn MJ (2003) Geochemical zoning in metamorphic minerals. Treatise on Geochemistry 3:229–261CrossRefGoogle Scholar
  32. Kretz R (1974) Some models for the rate of crystallization of garnet in metamorphic rocks. Lithos 7:123–131CrossRefGoogle Scholar
  33. Kretz R (1993) A garnet population in Yellowknife schist, Canada. J Metamorph Geol 11:101–120CrossRefGoogle Scholar
  34. Krogh RE (2000) The garnet-clinopyroxene Fe2+−Mg geothermometer: an updated calibration. J Metamorph Geol 18:211–219CrossRefGoogle Scholar
  35. Kylander-Clark ARC, Hacker BR, Johnson CM, Beard BL, Mahlen NJ, Lapen TJ (2007) Coupled Lu–Hf and Sm–Nd geochronology constrains prograde and exhumation histories of high- and ultrahigh-pressure eclogites from western Norway. Chem Geol 242:137–154CrossRefGoogle Scholar
  36. Lagos M, Scherer EE, Tomaschek F, Münker C, Keiter M, Berndt J, Ballhaus C (2007) High Precision Lu–Hf geochronology of Eocene eclogite-facies rocks from Syros, Cyclades, Greece. Chem Geol 243:16–35CrossRefGoogle Scholar
  37. Lapen TJ, Johnson CM, Baumgartner LP, Mahlen NJ, Beard BL, Amato JM (2003) Burial rates during prograde metamorphism of an ultra-high-pressure terrane: an example from Lago di Cignana, western Alps, Italy. Earth Planet Sci Lett 215:57–72CrossRefGoogle Scholar
  38. Li S, Xiao Y, Liu D, Chen Y, Ge N, Zhang Z, Sun S, Cong B, Zhang R, Hart SR, Wang S (1993) Collision of the North China and Yangtze Blocks and formation of coesite-bearing eclogites: Timing and processes. Chem Geol 109:89–111CrossRefGoogle Scholar
  39. Li S, Jagoutz E, Chen Y, Li Q (2000) Sm–Nd and Rb–Sr isotopic chronology and cooling history of ultrahigh pressure metamorphic rocks and their country rocks at Shuanghe in the Dabie Mountains, Central China. Geochim Cosmochim Acta 64:1077–1093CrossRefGoogle Scholar
  40. Li X, Zheng Y, Wu Y, Chen F, Gong B, Li Y (2004) Low-T eclogite in the Dabie terrane of China: petrological and isotopic constraints on fluid activity and radiometric dating. Contrib Mineral Petrol 148:443–470Google Scholar
  41. Liu DY, Jian P, Kröner A, Xu ST (2006) Dating of prograde metamorphic events deciphered from episodic zircon growth in rocks of the Dabie Sulu UHP complex, China. Earth Planet Sci Lett 250:650–666CrossRefGoogle Scholar
  42. Luais B, Duchêne S, de Sigoyer J (2001) Sm–Nd disequilibrium in high-pressure low-temperature Himalayan and Alpine rocks. Tectonophy 342:1–22CrossRefGoogle Scholar
  43. Ludwig KR (2003) ISOPLOT: a Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication 4, p 71Google Scholar
  44. Manning CE (2004) The chemistry of subduction-zone fluids. Earth Planet Sci Lett 223:1–16CrossRefGoogle Scholar
  45. Miller JA, Buick IS, Cartwright I, Barnicoat A (2002) Fluid processes during the exhumation of high-P metamorphic belts. Mineral Mag 12:827–840Google Scholar
  46. Mock A, Jerram DA (2005) Crystal size distributions (CSD) in three dimensions: Insights from the 3D reconstruction of a highly porphyritic rhyolite. J Petrol 46:1525–1541CrossRefGoogle Scholar
  47. Müller W (2003) Strengthening the link between geochronology, textures and petrology. Earth Planet Sci Lett 206:237–251CrossRefGoogle Scholar
  48. Okay A (1993) Petrology of a diamond and coesite-bearing metamorphic terrain: Dabie Shan, China. Eur J Mineral 5:659–675Google Scholar
  49. Okay AI, Xu S, Sengor AMC (1989) Coesite from the Dabie Shan eclogites, central China. Eur J Mineral 1:595–598Google Scholar
  50. Powell R, Holland TJB (1985) An internally consistent thermodynamic dataset with uncertainties and correlations; I, methods and a worked example. J Metamorph Geol 3:27–342Google Scholar
  51. Rowley DB, Xue F, Tucker RD, Peng ZX, Baker J, Davis A (1997) Ages of ultrahigh pressure metamorphism and protolith orthogneisses from the eastern Dabie Shan: U/Pb zicorn geochronology. Earth Planet Sci Lett 155:191–203CrossRefGoogle Scholar
  52. Rumble D, Giorgis D, Oreland T, Zhang ZM, Xu HF, Yui TF, Yang JS, Xu ZQ, Liou JG (2002) Low δ18O zircons, U–Pb dating, and the age of the Qinglongshan oxygen and hydrogen isotope anomaly near Donghai in Jiangsu province, China. Geochim Cosmochim Acta 66:2299–2306CrossRefGoogle Scholar
  53. Rumble D, Yui TF (1998) The Quinglongshan oxygen and hydrogen isotope anomaly near Donghai in Jiangsu Province, China. Geochim Cosmochim Acta 62:3307–3321CrossRefGoogle Scholar
  54. Scherer EE, Münker C, Mezger K (2001) Calibration of the lutetium–hafnium clock. Science 95:683–686CrossRefGoogle Scholar
  55. Schmid R, Wilke M, Oberhänsli R, Janssens K, Falkenberg G, Franz L, Gaab A (2003) Micro-XANES determination of ferric iron and its application in thermobarometry. Lithos 70:381–392CrossRefGoogle Scholar
  56. Schmidt NH, Olesen NO (1989) Computer-aided determination of crystal lattice orientation from electron channeling patterns in the SEM. Can Mineral 27:15–22Google Scholar
  57. Schmidt MW, Poli S (2003) Generation of mobile components during subduction of oceanic crust. Treatise on Geochem 3:567–591CrossRefGoogle Scholar
  58. Shi Y, Wang Q (2006) Variation in peak P–T conditions across the upper contact of the UHP terrane, Dabieshan, China: gradational or abrupt? J Metamorph Geol 24:803–822Google Scholar
  59. Skora S, Baumgartner LP, Mahlen NJ, Johnson CM, Pilet S, Hellebrand E (2006) Diffusion-limited REE uptake by eclogite garnets and its consequences for Lu–Hf and Sm–Nd geochronology. Contrib Mineral Petrol 152:703–720CrossRefGoogle Scholar
  60. Söderlund U, Patchett PJ, Vervoort JD, Isachsen CE (2004) The 176Lu decay constant determined by Lu–Hf and U–Pb isotope systematics of Precambrian mafic intrusions. Earth Planet Sci Lett 219:311–324CrossRefGoogle Scholar
  61. Spear FS (1993) Metamorphic phase equilibria and pressure–temperature–time paths, vol. 1. Monograph, Mineralogical Society of America, Chantilly, p 799Google Scholar
  62. Spear FS, Selverstone J (1983) Quantitative P–T paths from zoned minerals: theory and tectonic applications. Contrib Mineral Petrol 83:348–357CrossRefGoogle Scholar
  63. Touret JLR (2001) Fluids in metamorphic rocks. Lithos 55:1–25CrossRefGoogle Scholar
  64. Vervoort JD, Patchett PJ, Söderlund U, Baker M (2004) Isotopic composition of Yb and the determination of Lu concentrations and Lu/Hf ratios by isotope dilution using MC–ICPMS. Geochem Geophys Geosystems 5:11002 doi: 10.1029/2004GC000721 CrossRefGoogle Scholar
  65. Wang X, Liou JG (1991) Regional ultrahigh-pressure coesite-bearing eclogitic terrane in central China: evidence from country rocks, gneiss, marble, and metapelite. Geology 19:933–936CrossRefGoogle Scholar
  66. Wang X, Liou JG, Mao HK (1989) Coesite-bearing eclogite from the Dabie Mountains, central China. Geology 17:1085–1088CrossRefGoogle Scholar
  67. Waters DJ, Martin HN (1993) Geobarometry of phengite-bearing eclogites. Terra Abs 5:410–411Google Scholar
  68. Wu YB, Zheng YF, Zhao ZF, Gong B, Liu XM, Wu FY (2006) U–Pb, Hf and O isotope evidence for two episodes of fluid-assisted zircon growth in marble-hosted eclogites from the Dabie orogen. Geochim Cosmochim Acta 70:3743–3761CrossRefGoogle Scholar
  69. Xiao YL, Zhang ZM, Hoefs J, van den Kerkhof AM (2006) Ultrahigh-pressure metamorphic rocks from the Chinese continental scientific drilling project-II. oxygen isotope and fluid inclusion distributions through vertical sections. Contrib Mineral Petrol 152:443–458CrossRefGoogle Scholar
  70. Xie Z, Zheng YF, Jahn B, Ballevre M, Chen JF, Gautier P, Gao T, Gong B, Zhou J (2004) Sm–Nd and Rb–Sr dating for pyroxene-garnetite from North Dabie in east-central China: problem of isotope disequilibrium due to retrograde metamorphism. Chem Geol 206:137–158CrossRefGoogle Scholar
  71. Xu S, Okay AI, Ji S, Sengor AMC, Su W, Liu Y, Jiang L (1992) Diamond from the Dabie Shan metamorphic rocks and its implication for tectonic setting. Science 256:80–82CrossRefGoogle Scholar
  72. Yui TF, Rumble D, Lo CH (1995) Unusually low δ18O ultra-high-pressure metamorphic rocks from the Sulu terrain, east China. Geochem Cosmochim Acta 13:2859–2864CrossRefGoogle Scholar
  73. Yui TF, Rumble D, Chen CH, Lo CH (1997) Stable isotope charateristics of eclogites from the ultra-high pressure metamorphic terrain, east-central China. Chem Geol 137:135–147CrossRefGoogle Scholar
  74. Zhao ZF, Chen B, Zheng YF, Chen RX, Wu YB (2006) Mineral oxygen isotope and hydroxyl content changes in ultrahigh-pressure eclogite–gneiss contacts from Chinese continental scientific drilling project cores. J Metamorph Geol 25:165–186CrossRefGoogle Scholar
  75. Zheng YF, Fu B, Gong B, Li S (1996) Extreme δ18O depletion in eclogite from Su–Lu terrane in East China. Eur J Mineral 8:317–323Google Scholar
  76. Zheng YF, Fu B, Gong B, Li S (2003) Stable isotope geochemistry of ultrahigh pressure metamorphic rocks from Dabie–Sulu orogen in China: implications for geodynamics and fluid regime. Earth Sci Rev 62:105–161CrossRefGoogle Scholar
  77. Zheng YF, Fu B, Li YL, Xiao YL, Li SG (1998) Oxygen and hydrogen isotope geochemistry of ultrahigh-pressure eclogites from the Dabie mountains and Sulu terrane. Earth Planet Sci Lett 155:113–129CrossRefGoogle Scholar
  78. Zheng YF, Fu B, Xiao YL, Li YL, Gong B (1999) Hydrogen and oxygen isotope evidence for fluid–rock interactions in the stages of pre- and post-UHP metamorphism in the Dabie mountains. Lithos 46:677–693CrossRefGoogle Scholar
  79. Zheng YF, Wu YB, Chen FK, Gong B, Li L, Zhao ZF (2004) Zircon U–Pb and oxygen isotope evidence for a large-scale 18O depletion event in igneous rocks during the Neoproterozoic. Geochem Cosmochim Acta 68:4145–4165CrossRefGoogle Scholar
  80. Zheng YF, Wu YB, Zhao ZF, Zhang SB, Xu P, Wu FY (2005) Metamorphic effect on zircon Lu–Hf and U–Pb isotope systems in ultrahigh-pressure eclogite-facies metagranite and metabasite. Earth Planet Sci Lett 240:378–400CrossRefGoogle Scholar
  81. Zheng YF, Gao TS, Wu YB, Gong B (2007) Fluid flow during exhumation of deeply subducted continental crust: Zircon U–-Pb age and O isotope studies of quartz vein in eclogite. J Metamorph Geol 25:267–283CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.State Key Laboratory of Marine GeologyTongji UniversityShanghaiChina
  2. 2.Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Study of the Earth’s InteriorOkayama University at MisasaTottoriJapan

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