Age, trace elements and Hf-isotope composition of zircon in eclogites from the sulu UHP belt, East-Central China: Neoproterozoic intrusion and subsequent Paleozoic and Early Mesozoic metamorphism
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- 作者：Jianping Zheng (1)
Huayun Tang (1)
Junhong Zhao (1)
Yuping Su (1)
Chunmei Yu (1)
Qirong Wei (1)
Qingsheng Liu (1)
Xiuling Wu (1) - 关键词：age ; composition ; zircon ; eclogite ; Sulu UHP terrane ; East ; Central China
- 刊名：Journal of Earth Science
- 出版年：2010
- 出版时间：October 2010
- 年：2010
- 卷：21
- 期：5
- 页码：598-622
- 全文大小：1101KB
- 参考文献：1. Amelin, Y., Davis, W. J., 2005. Geochemical Test for Branching Decay of 176Lu. / Geochim. Cosmochim. Acta, 69(2): 465-73 CrossRef
2. Ames, L., Tilton, G. R., Zhou, G. Z., 1993. Timing of Collision of the Sino-Korean and Yangtze Cratons: U-Pb Zircon Dating of Coesite-Bearing Eclogites. / Geology, 21: 339-42 CrossRef
3. Ames, L., Zhou, G. Z., Xiong, B. C., 1996. Geochronology and Isotopic Character of Ultrahigh-Pressure Metamorphism with Implications for Collision of the Sino-Korean and Yangtze Cratons, Central China. / Tectonics, 15(2): 472-89 CrossRef
4. Andersen, T., 2002. Correction of Common Lead in U-Pb Analyses that do not Report 204Pb. / Chem. Geol., 192(1-): 59-9 CrossRef
5. Ayers, J. C., Dunkle, S., Gao, S., et al., 2002. Constraints on Timing of Peak and Retrograde Metamorphism in the Dabie Shan Ultrahigh-Pressure Metamorphic Belt, East-Central China, Using U-Th-Pb Dating of Zircon and Monazite. / Chem. Geol., 186(3-): 315-31 CrossRef
6. Baldwin, J. A., Brown, M., Schmitz, M. D., 2007. First Application of Titanium-in-Zircon Thermometry to Ultrahigh-Temperature Metamorphism. / Geology, 35: 295-98 CrossRef
7. Belousova, E. A., Griffin, W. L., O’Reilly, S. Y., 2006. Zircon Crystal Morphology, Trace Element Signatures and Hf-Isotope Composition as a Tool for Petrogenetic Modelling: Examples from Eastern Australian Granitoids. / J. Petrol., 47(2): 329-53 CrossRef
8. Belousova, E. A., Griffin, W. L., O’Reilly, S. Y., et al., 2002. Igneous Zircon: Trace Element Composition as an Indicator of Source Rock Type. / Contrib. Mineral. Petrol., 143(5): 602-22 CrossRef
9. Belousova, E. A., Griffin, W. L., Shee, S. R., et al., 2001. Two Age Populations of Zircons from the Timber Creek Kimberlites, Northern Territory, as Determined by Laser Ablation ICP-MS Analysis. / Aus. J. Earth Sci., 48(5): 757-65
10. Chavagnac, V., Jahn, B. M., 1996. Coesite-Bearing Eclogites from the Bixiling Complex, Dabie Mountains, China: Sm-Nd Ages, Geochemical Characteristics and Tectonic Implications. / Chem. Geol., 133(1-): 29-1 CrossRef
11. Cheng, Y. Q., Liu, D. Y., Willimas, I. S., et al., 2000. SHRIMP U-Pb Dating of Zircons of a Dark Eclogite and a Garnet-Bearing Gneissic-Granitic Rock from Bixiling, Eastern Dabie Area, Anhui Province: Isotope Chronological Evidence of Neoproterozoic UHP Metamorphism. / Acta Geol. Sinica, 74(4): 748-65
12. DeBièvre, P., Taylor, P. D. P., 1993. Table of the Isotopic Composition of the Elements. / Int. J. Mass Spectrom. Ion Process, 123: 149 CrossRef
13. Griffin, W. L., Pearson, N. J., Belousova, E., et al., 2000. The Hf Isotope Composition of Cratonic Mantle: LAM-MC-ICPMS Analysis of Zircon Megacrysts in Kimberlites. / Geochim. Cosmochim. Acta, 64(1): 133-47 CrossRef
14. Griffin, W. L., Powell, W. J., Pearson, N. J., et al., 2008. GLITTER: Data Reduction Software for Laser Ablation ICP-MS. In: Sylvester, P., ed., Laser Ablation-ICP-MS in the Earth Sciences. / Mineralogical Association of Canada Short Course Series. 40(Appendix 2): 204-07
15. Griffin, W. L., Wang, X., Jackson, S. E., et al., 2002. Zircon Chemistry and Magma Mixing. SE China: In-Situ Analysis of Hf Isotopes, Tonglu and Pingtan Igneous Complexes. / Lithos, 61(3-): 237-69 CrossRef
16. Hacker, B. R, Ratschbacher, L., Webb, L., et al., 1998. U/Pb Zircon Ages Constrain the Architecture of the Ultrahigh-Pressure Qinling-Dabie Orogen, China. / Earth Planet. Sci. Lett., 161(1-): 215-30 CrossRef
17. Hacker, B. R., Ratschbacher, L., Webb, L., et al., 2000. Exhumation of Ultrahigh-Pressure Continental Crust in East Central China: Late Triassic-Early Jurassic Tectonic Unroofing. / J. Geophys. Res., 105(B6): 13339-3364 CrossRef
18. Hirata, T., Nesbitt, R. W., 1995. U-Pb Isotope Geochronology of Zircon: Evaluation of the Laser Probe-Inductively Coupled Plasma-Mass Spectrometry Technique. / Geochim. Cosmochim. Acta, 59(12): 2491-500 CrossRef
19. Hoskin, P. W. O., Ireland, T. R., 2000. Rare Earth Element Chemistry of Zircon and Its Use as a Provenance Indicator. / Geology, 28: 627-30 CrossRef
20. Huang, F., Li, S. G., Dong, F., et al., 2007. Recycling of Deeply Subducted Continental Crust in the Dabie Mountains, Central China. / Lithos, 96(1-): 151-69 CrossRef
21. Huang, J., Zheng, Y. F., Zhao, Z. F., et al., 2006. Melting of Subducted Continent: Element and Isotopic Evidence for a Genetic Relationship between Neoproterozoic and Mesozoic Granitoids in the Sulu Orogen. / Chem. Geol., 229(4): 227-56 CrossRef
22. Jackson, S. E., Pearson, N. J., Griffin, W. L., et al., 2004. The Application of Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry to in situ U-Pb Zircon Geochronology. / Chem. Geol., 211(1-): 47-9 CrossRef
23. Jahn, B. M., 1998. Geochemical and Isotopic Characteristics of UHP Eclogites and Ultramafic Rocks of the Dabie Orogen: Implications for Continental Subduction and Collisional Tectonics. In: Hacker, B. R., Liou, J. G., eds., When Continent Collide: Geodynamics and Geochemistry of Ultrahigh-Pressure Rocks. Kluwer Academic Publishers, Netherlands. 203-39
24. Katsube, A., Hayasaka, Y., Santosh, M., et al., 2008. SHRIMP Zircon U-Pb Ages of Eclogite and Orthogneiss from Sulu Ultrahigh-Pressure Zone in Yangkou Area, Eastern China. / Gondwana Res., 15(2): 168-77 CrossRef
25. Li, S. G., Huang, F., Nie, Y. H., et al., 2001. Geochemical and Geochronological Constraints on the Suture Location between the North and South China Blocks in the Dabie Orogen, Central China. / Phys. Chem. Earth ( / A), 26(9-0): 655-72 CrossRef
26. Li, S. G., Jagoutz, E., Chen, Y. Z., et al., 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(6): 1077-093 CrossRef
27. Li, S. G., Xiao, Y. L., Liou, D. L., et al., 1993. Collision of the North China and Yangtze Blocks and Formation of Coesite-Bearing Eclogites: Timing and Processes. / Chem. Geol., 109(1-): 89-11 CrossRef
28. Li, Z. X., Li, X. H., Kinny, P. D., et al., 2003. Geochronology of Neoproterozoic Syn-rift Magmatism in the Yangtze Craton (South China) and Correlations with Other Continents: Evidence for a Mantle Superplume that Broke up Rodinia. / Precamb. Res., 122(1-): 85-09 CrossRef
29. Liou, J. G., Hacker, B. R., Zhang, R. Y., 2000. Into the Forbidden Zone. / Science, 287(5456): 1215-216 CrossRef
30. Liu, D. Y., Jian, P., Krener, A., et al., 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(3-): 650-66 CrossRef
31. Liu, D. Y., Nutman, A. P., Compston, W., et al., 1992. Remnants of >3 800 Ma Crust in Chinese Part of the Sino-Korean Craton. / Geology, 20: 339-42 CrossRef
32. Liu, F. L., Liou, J. G., Xu, Z. Q., 2005. U-Pb SHRIMP Ages Recorded in the Coesite-Bearing Zircon Domains of Paragneisses in the Southwestern Sulu Terrane, Eastern China: New Interpretation. / Amer. Mineral., 90: 790-00 CrossRef
33. Liu, F. L., Xu, Z. Q., Xue, H. M., 2004. Tracing the Protolith, UHP Metamorphism, and Exhumation Ages of Orthogneiss from the SW Sulu Terrane (Eastern China): SHRIMP U-Pb Dating of Mineral Inclusion-Bearing Zircons. / Lithos, 78(4): 411-29 CrossRef
34. Liu, F. L., Xue, H. M., 2007. Review and Prospect of SHRIMP U-Pb Dating on Zircons from Sulu-Dabie UHP Metamorphic Rocks. / Acta Petrologica Sinica, 23(11): 2737-756 (in Chinese with English Abstract)
35. Liu, Y. C., Li, S. G., Xu, S. T., 2007. Zircon SHRIMP U-Pb Dating for Gneisses in Northern Dabie High T/P Metamorphic Zone, Central China: Implications for Decoupling within Subducted Continental Crust. / Lithos, 96(1-): 170-85 CrossRef
36. Liu, Y. C., Li, S. G., Xu, S. T., et al., 2005. Geochemistry and Geochronology of Eclogites from the Northern Dabie Mountains, Central China. / J. Asian Earth Sci., 25(3): 431-43 CrossRef
37. Lu, F. X., Wang, Y., Chen, M. H., et al., 1998. Geochemical Characteristics and Emplacement Ages of the Mengyin Kimberlites, Shandong Province, China. / Int. Geol. Rev., 40(11): 998-006 CrossRef
38. Ludwig, K. R., 2003. Isoplot-EX Version 3.0: A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center, California. 53
39. Maruyama, S., Tabata, H., Nutman, A. P., et al., 1998. SHRIMP U-Pb Geochronology of Ultrahigh-Pressure Metamorphic Rocks of the Dabie Mountains, Central China. / Continental Dynamics, 3(1-): 72-5
40. Qiu, Y. M., Gao, S., McNaughton, N. J., et al., 2000. First Evidence of >3.2 Ga Continental Crust in the Yangtze Craton of South China and Its Implications for Archean Crustal Evolution and Phanerozoic Tectonics. / Geology, 28: 11-4 CrossRef
41. Rowley, D. B., Xue, F., Tucker, R. D., et al., 1997. Ages of Ultrahigh Pressure Metamorphism and Protolith Orthogneisses from the Eastern Dabie Shan: U/Pb Zircon Geochronology. / Earth Planet. Sci. Lett., 151(3-): 191-03 CrossRef
42. Rubatto, D., 2002. Zircon Trace Element Geochemistry: Partitioning with Garnet and the Link between U-Pb Ages and Metamorphism. / Chem. Geol., 184(1-): 123-38 CrossRef
43. Rumble, D., Wang, Q. C., Zhang, R. Y., 2000. Stable Isotope Geochemistry of Marbles from the Coesite UHP Terrains of Dabieshan and Sulu, China. / Lithos, 52(1-): 79-5 CrossRef
44. Schmidt, A., Weyer, S., Mezger, K., et al., 2008. Rapid Eclogitisation of the Dabie-Sulu UHP Terrane: Constraints from Lu-Hf Garnet Geochronology. / Earth Planet. Sci. Lett., 273(1-): 203-13 CrossRef
45. Tang, J, Zheng, Y. F., Wu, Y. B., et al., 2008. Zircon U-Pb Age and Geochemical Constraints on the Tectonic Affinity of the Jiaodong Terrane in the Sulu Orogen, China. / Precamb. Res., 161(3-): 389-18 CrossRef
46. Tang, J., Zheng, Y. F., Wu, Y. B., et al., 2007. Geochronology and Geochemistry of Metamorphic Rocks in the Jiaobei Terrane: Constraints on Its Tectonic Affinity in the Sulu Orogen. / Precamb. Res., 152(1-): 48-2 CrossRef
47. Taylor, S. R., McLennan, S. M., 1985. The Continental Crust: Its Composition and Evolution. Blackwell, Oxford. 312
48. Wan, Y. S., Li, R. W., Wilde, S. A., et al., 2005. UHP Metamorphism and Exhumation of the Dabie Orogen, China: Evidence from SHRIMP Dating of Zircon and Monazite from a UHP Granitic Gneiss Cobble from the Hefei Basin. / Geochim. Cosmochim. Acta, 69(17): 4333-348 CrossRef
49. Wang, L. M., Wu, H. X., Song, B., et al., 1994. Protolith Age of Eclogites in Shandong Province: Zircon U-Pb Dating of Single Grains. / Chin. Sci. Bull., 39(19): 1788-791 (in Chinese)
50. Watson, E. B., Wark, D. A., Thomas, J. B., 2006. Crystallization Thermometers for Zircon and Rutile. / Contrib. Mineral. Petrol., 151(4): 413-33 CrossRef
51. Wawrzenitz, N., Romer, R. L., Oberhensli, R., et al., 2006. Dating of Subduction and Differential Exhumation of UHP Rocks from the Central Dabie Complex (E-China): Constraints from Microfabrics, Rb-Sr and U-Pb Isotope Systems. / Lithos, 89(1-): 174-01 CrossRef
52. Wu, Y. B., Hanchar, J. M., Gao, S., et al., 2009. Age and Nature of Eclogites in the Huwan Shear Zone, and the Multi-Stage Evolution of the Qinling-Dabie-Sulu Orogen, Central China. / Earth Planet. Sci. Lett., 277(3-): 345-54 CrossRef
53. Wu, Y. B., Zheng, Y. F., Zhao, Z. F., et al., 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(14): 3743-761 CrossRef
54. Xu, B., Grove, M., Wang, C. Q., et al., 2000. 40Ar/39Ar Thermochronology from the Northwestern Dabie Shan: Constraints on the Evolution of Qinling-Dabie Orogenic Belt, East-Central China. / Tectonophysics, 322(3-): 279-01 CrossRef
55. Yang, J. S., Wooden, J. L., Wu, C. L., et al., 2003. SHRIMP U-Pb Dating of Coesite-Bearing Zircon from the Ultrahigh-Pressure Metamorphic Rocks, Sulu Terrane, East China. / J. Metamorph. Geol., 21(6): 551-60 CrossRef
56. Ye, K., Cong, B. L., Ye, D. N., 2000. The Possible Subduction of Continental Material to Depths Greater than 200 km. / Nature, 407(6805): 734-36 CrossRef
57. Zhang, R. Y., Liou, J. G., Zheng, J. P., et al., 2005a. Petrogenesis of the Yangkou Layered Garnet Peridotite Complex, Sulu UHP Terrane, China. / Amer. Mineral., 90: 801-13 CrossRef
58. Zhang, R. Y., Yang, J. S., Wooden, J. L., et al., 2005b. U-Pb SHRIMP Geochronology of Zircon in Garnet Peridotite from the Sulu UHP Terrane, China: Implications for Mantle Metasomatism and Subduction Zone UHP Metamorphism. / Earth Planet. Sci. Lett., 237(3-): 729-43 CrossRef
59. Zhang, R. Y., Liou, J. G., Yang, J. S., et al., 2000. Petrochemical Constraints for Dual Origin of Garnet Peridotites from the Dabie-Sulu UHP Terrane, Eastern-Central China. / J. Metamorph. Geol., 18(2): 149-66 CrossRef
60. Zhang, R. Y., Liou, J. G., Yang, J. S., et al., 2003. Ultrahigh-Pressure Metamorphism in the Forbidden Zone: The Xugou Garnet Peridotite, Sulu Terrane, Eastern China. / J. Metamorph. Geol., 21(6): 539-50 CrossRef
61. Zhang, R. Y., Liou, J. G., Zheng, J. P., et al., 2009. Petrogenesis of Eclogites Enclosed in Mantle-Derived Peridotites from the Sulu UHP Terrane: Constraints from Trace Elements in Minerals and Hf Isotopes in Zircon. / Lithos, 109(3-): 176-92 CrossRef
62. Zhang, R. Y., Pan, Y. M., Yang, Y. H., et al., 2008. Chemical Composition and Ultrahigh- / P Metamorphism of Garnet Peridotites from the Sulu UHP Terrane, China: Investigation of Major, Trace Elements and Hf Isotopes of Minerals. / Chem. Geol., 255(1-): 250-64 CrossRef
63. Zhang, S. B., Zheng, Y. F., Wu, Y. B., et al., 2006. Zircon U-Pb Age and Hf-O Isotope Evidence for Paleoproterozoic Metamorphic Event in South China. / Precamb. Res., 151(3-): 265-88 CrossRef
64. Zhang, Z. M., Shen, K., Xiao, Y. L., et al., 2006. Mineral and Fluid Inclusions in Zircon of UHP Metamorphic Rocks from the CCSD-Main Drill Hole: A Record of Metamorphism and Fluid Activity. / Lithos, 92(3-): 378-98 CrossRef
65. Zhao, G. C., Cawood, P. A., Wilde, S. A., et al., 2000. Metamorphism of Basement Rocks in the Central Zone of the North China Craton: Implications for Paleoproterozoic Tectonic Evolution. / Precamb. Res., 103(1-): 55-8 CrossRef
66. Zhao, Z. F., Gao T. S., 2007. Comment on “Paleozoic Ages and Excess 40Ar in Garnets from the Bixiling Eclogite in Dabieshan, China: New Insights from 40Ar/39Ar Dating by Stepwise Crushing-by Qiu and Wijbrans (2006). / Geochim. Cosmochim. Acta, 71(24): 6046-050 CrossRef
67. Zhao, Z. F., Zheng, Y. F., Gao, T. S., et al., 2006. Isotopic Constraints on Age and Duration of Fluid-Assisted High-Pressure Eclogite-Facies Recrystallization during Exhumation of Deeply Subducted Continental Crust in the Sulu Orogen. / J. Metamorph. Geol., 24(8): 687-02 CrossRef
68. Zhao, Z. F., Zheng, Y. F., Wei, C. S., et al., 2005. Zircon U-Pb Age, Element and C-O Isotope Geochemistry of Post-Collisional Mafic-Ultramafic Rocks from the Dabie Orogen in East-Central China. / Lithos, 83(1-): 1-8 CrossRef
69. Zheng, J. P., Griffin, W. L., O’Reilly, S. Y., et al., 2004a. 3.6 Ga Lower Crust in Central China: New Evidence on the Assembly of the North China Craton. / Geology, 32: 229-32 CrossRef
70. Zheng, J. P., Griffin, W. L., O’Reilly, S. Y., et al., 2004b. U-Pb and Hf-Isotope Analysis of Zircons in Mafic Xenoliths from Fuxian Kimberlites: Evolution of the Lower Crust beneath the North China Craton. / Contrib. Mineral. Petrol., 148(1): 79-03 CrossRef
71. Zheng, J. P., Griffin, W. L., O’Reilly, S. Y., et al., 2006a. A Refractory Mantle Protolith in Younger Continental Crust, East-Central China: Age and Composition of Zircon in the Sulu UHP Peridotite. / Geology, 34: 705-08 CrossRef
72. Zheng, J. P., Griffin, W. L., O’Reilly, S. Y., et al., 2006b. Widespread Archean Basement beneath the Yangtze Craton. / Geology, 34: 417-20 CrossRef
73. Zheng, J. P., Griffin, W. L., O’Reilly, S. Y., et al., 2006c. Zircons in Mantle Xenoliths Record the Triassic Yangtze-North China Continental Collision. / Earth Planet. Sci. Lett., 247(1-): 130-42 CrossRef
74. Zheng, J. P., Sun, M., Griffin, W. L., et al., 2008a. Age and Geochemistry of Contrasting Peridotite Types in the Dabie UHP Belt, Eastern China: Petrogenetic and Geodynamic Implications. / Chem. Geol., 247(1-): 282-04 CrossRef
75. Zheng, J. P., Griffin, W. L., O’Reilly, S. Y., et al., 2008b. Continental Collision and Accretion Recorded in the Deep Lithosphere of Central China. / Earth Planet. Sci. Lett., 269(3-): 496-06
76. Zheng, Y. F., Chen, R. X., Zhang, S. B., et al., 2007a. Zircon Lu-Hf Isotope Study of Ultrahigh-Pressure Eclogite and Granitic Gneiss in the Dabie Orogen. / Acta Petrol. Sin., 23(2): 317-30 (in Chinese with English Abstract)
77. Zheng, Y. F., Zhang, S. B., Zhao, Z. F., et al., 2007b. Contrasting Zircon Hf and O Isotopes in the Two Episodes of Neoproterozoic Granitoids in South China: Implications for Growth and Reworking of Continental Crust. / Lithos, 96(1-): 127-50 CrossRef
78. Zheng, Y. F., Chen, R. X., Zhao, Z. F., 2009. Chemical Geodynamics of Continental Subduction-Zone Metamorphism: Insights from Studies of the Chinese Continental Scientific Drilling (CCSD) Core Samples. / Tectonophysics, 475(2): 327-5 CrossRef
79. Zheng, Y. F., Yang, J. J., Gong, B., et al., 2003a. Partial Equilibrium of Radiogenic and Stable Systems in Garnet Peridotite during Ultrahigh-Pressure Metamorphism. / Amer. Mineral., 88: 1633-643
80. Zheng, Y. F., Gong, B., Zhao, Z. F., et al., 2003b. Two Types of Gneisses Associated with Eclogite at Shuanghe in the Dabie Terrane: Carbon Isotope, Zircon U-Pb Dating and Oxygen Isotope. / Lithos, 70(3-): 321-43 CrossRef
81. Zheng, Y. F., Wang, Z. R., Li, S. G., et al., 2002. Oxygen Isotope Equilibrium between Eclogite Minerals and Its Constraints on Mineral Sm-Nd Chronometer. / Geochim. Cosmochim. Acta, 66(4): 625-34 CrossRef
82. Zheng, Y. F., Wu, Y. B., Chen, F. K., et al., 2004. Zircon U-Pb and Oxygen Isotope Evidence for a Large-Scale 18O Depletion Event in Igneous Rocks during the Neoproterozoic. / Geochim. Cosmochim. Acta, 68(20): 4145-165 CrossRef
83. Zheng, Y. F., Wu, Y. B., Zhao, Z. F., et al., 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(2): 378-00 CrossRef
84. Zheng, Y. F., Zhao, Z. F., Wu, Y. B., et al., 2006. Zircon U-Pb Age, Hf and O Isotope Constraints on Protolith Origin of Ultrahigh-Pressure Eclogite and Gneiss in the Dabie Orogen. / Chem. Geol., 231(1-): 135-58 CrossRef - 作者单位：Jianping Zheng (1)
Huayun Tang (1)
Junhong Zhao (1)
Yuping Su (1)
Chunmei Yu (1)
Qirong Wei (1)
Qingsheng Liu (1)
Xiuling Wu (1)
1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China - ISSN：1867-111X
文摘
The Sulu ()-Dabie () orogen in East-Central China formed during the subduction and collision of the Yangtze block with the North China block in Early Mesozoic (240-25 Ma). Constraints on the nature and derivation of eclogites, which are a significant component of the orogen, can provide useful information about subduction-zone metamorphism and crust-mantle interaction. The U-Pb ages, Hf-isotope ratios and trace-element compositions of zircons in eclogites from the Jiangzhuang () (Jiangsu () Province) and Rongcheng () (Shandong () Province) areas indicate that the protoliths of the eclogites derived from ultramafic-mafic complexes or mafic intrusion in the subducted continental lithosphere. The upper intercept age of 852±10 Ma and high Hf (up to 14.7) of the Neoproterozoic zircons in a Jiangzhuang sample indicate that the protoliths represent products of the Neoproterozoic addition of juvenile materials to the older (i.e., Paleo-Mesoproterozoic) continental crust. The zircon ages of eclogites from both localities mainly record the Triassic (230-20 Ma) metamorphism, consistent with the formation of the Sulu orogen in Early Mesozoic. The lower intercept age of 316±4 Ma in a Jiangzhuang sample suggests that thermal activity relating to the paleo-Tethyan in Late Carboniferous also affected the eclogitic protolith.