 | | Journal (article/letter/editorial) | | reef-hosted Jiaodingshan Mn–Co deposit and Dawashan Mn deposit, Sichuan Province, China Delian Fan a,) ,...Academy of Sciences, PO Box 9825, Beijing 100029, China U.S. Geological SurÕey, Coastal and Marine Geology...22 March 1999 Abstract The Jiaodingshan Mn–Co and Dawashan Mn deposits are located in the approximately...and the Kangdian continent. The Jiaodingshan and Dawashan deposits occur in algal-reef facies, the former...high-grade Jiaodingshan and Dawashan ores assay as much as 66.7% MnO. Jiaodingshan Mn carbonate ores have mean |  | | Journal (article/letter/editorial) | | rock-hosted deposits can also be identified: those with Mn derived via upwelling from oxygen-minimum zones and...additional strong peak in the Oligocene. Therefore, Mn is not controlled entirely by the level of oxygen...oxygen in the Earth’s atmosphere. At each peak of Mn deposition, the associated ore deposits are concentrated...There is a conspicuous gap in sedimentary rock-hosted Mn deposits between 1800 and 800 Ma that may correspond...but one without sulfidic deep water. Alternatively, Mn may have been precipitated entirely in the deep ocean |
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