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Geochronology and geochemistry of leucosomes in the North Dabie Terrane, East China: implication for post-UHPM crustal melting during exhumation

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Abstract

Migmatites are widespread in the North Dabie ultrahigh-pressure metamorphic terrane (NDT) of Dabie orogen, East China. Idiomorphic and poikilitic amphibole grains in both leucosome and melanosome contain inclusions of plagioclase, quartz and biotite, suggesting formation of leucosome by fluid-present melting of biotite + plagioclase + quartz-bearing protoliths at P = 5–7 kbar, T = 700–800 °C. Precise SIMS zircon U–Pb dating indicates that migmatization of Dabie orogen initiated at ~140 Ma and lasted for ~10 Ma, coeval with the formation of low-Mg# adakitic intrusions in Dabie orogen. Based on mineralogical, petrographic and geochemical data, leucosomes in NDT can be subdivided into three groups. (1) High La/Yb(N)–Medium Sr/Y group (Group I), whose high Dy/Yb(N) but medium Sr/Y ratios are caused by amphibole and plagioclase residual during partial melting of dioritic to granodioritic gneisses. (2) Low La/Yb(N)–Low Sr/Y group (Group II), whose flat HREE patterns are produced by entrainment of peritectic amphiboles into melts derived from partial melting of dioritic gneiss. (3) High La/Yb(N)–High Sr/Y and Eu# group (Group III), whose extremely high Sr and Eu but low other REE concentrations are caused by accumulation of plagioclase and quartz. Although Group I and III fall in the adakitic fields on La/Yb(N)–Yb(N) and Sr/Y–Y diagrams, they are chemically distinct from contemporary high-pressure adakitic intrusions in Dabie orogen in a series of geochemical indexes, for example, lower Dy/Yb(N) and/or Sr/Y ratios at given La/Yb(N) ratio, lower Sr/CaO ratios, lower Rb concentration but higher K/Rb ratios. Therefore, leucosomes are produced by anatexis of the exhumed ultrahigh-pressure metamorphic rocks at middle crustal level, instead of partial melting of thickened lower crust with garnet-rich and plagioclase-poor residual. The coeval occurrence of migmatites and high-pressure adakitic intrusions in Dabie orogen indicates large-scale partial melting of middle to thickened lower crustal column in the early Cretaceous. The required heat source may be the mantle heat conducting through the lithospheric mantle whose lower parts have been convectively removed.

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Acknowledgments

Xianhua Li, Qiuli Li, Yu Liu, and Guoqiang Tang are thanked for their assistance with Cameca 1280 zircon U–Pb dating. Discussions with Dr. Fang-Zhen Teng helped to improve an early version of the manuscript. Constructive comments from Michael Brown and an anonymous reviewer are greatly appreciated. This study was supported by funds from the State Key Basic Research Development Program (Grant No. 2009CB825002) and the National Nature Science Foundation of China (No. 40973016, 40921002, and 91014007).

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Authors and Affiliations

  1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China

    Shui-Jiong Wang, Shu-Guang Li & Yong-Sheng He

  2. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China

    Shu-Guang Li, Li-Juan Chen, Shi-Chao An & Ji Shen

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  1. Shui-Jiong Wang
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  2. Shu-Guang Li
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  3. Li-Juan Chen
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  4. Yong-Sheng He
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  5. Shi-Chao An
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  6. Ji Shen
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Correspondence to Shui-Jiong Wang or Shu-Guang Li.

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Communicated by J. Hoefs.

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Wang, SJ., Li, SG., Chen, LJ. et al. Geochronology and geochemistry of leucosomes in the North Dabie Terrane, East China: implication for post-UHPM crustal melting during exhumation. Contrib Mineral Petrol 165, 1009–1029 (2013). https://doi.org/10.1007/s00410-012-0845-2

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