Scientific Reports 4: Article number: 5696; published online: 16 July 2014; updated: 01 July 2015

The Acknowledgements section in this Article is incomplete.

“We would like to thank Dr. Hai-Liang Dong for his critical reading of this paper and valuable comments for improving the manuscript. We would like to thank Dr. Yu Zhang for providing the samples.”

should read:

“We would like to thank Dr. Hai-Liang Dong for his critical reading of this paper and valuable comments for improving the manuscript. We would like to thank Dr. Yu Zhang for providing the samples. This work was supported by the National Science Foundation of China (91228201), China Ocean Mineral Resources R&D Association (Grant No.DY125-15-T-04) and the National High-Tech Program (2012AA092103-2).”