We thank Jiawei Fan, Ruilin Wen and Dayou Zhai for help during fieldwork and Yinzhao Wang for assistance with magnetic extraction. TEM analyses were performed at the Institut de Mine´ralogie, de Physique des Mate´riaux, et de Cosmochimie (IMPMC), (CNRS UMR 7590, Sorbonne Universite´s, MNHN, UPMC, IRD UMR 206, 75005 Paris, France). This research was supported by the NSFC grant 41330104 and the 973 program grant 2012CB821900. J.X. was supported by the 973 program grant 2010CB833400 and the NSFC grant 41130101. J.L. received support from the NSFC grant 41374004. C.D. acknowledges further support from the NSFC grant 40925012 and the CAS Bairen Program.
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