Bibliographical noteFunding Information:
This research was funded by the German Research Foundation (DFG) under grant no. KA 1736/39-1 . We would like to thank several people for their assistance and contributions to this manuscript. Ellen Röhm for assisting with TOC analyses, as well as general laboratory assistance, Natalia Jakus for XRD sample preparation and measurements, Bernd Steinhilber for trace elements analyses, Lars Grimm for assisting with bacteria incubation, Julian Sorwat and Manuel Schad for Mössbauer spectroscopy measurements and spectra fitting. Y.P. and X.H. were supported by a grant of the National Natural Science Foundation of China ( 41621004 ).
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