GENESIS AND ORE-FORMING STAGES OF CO-RICH FERROMANGANESE CRUSTS FROM SEAMOUNT M OF MAGELLAN SEAMOUNTS: EVIDENCE FROM GEOCHEMISTRY AND CO CHRONOLOGY

REN Xiangwen; LIU Jihua; SHI Xuefa; CUI Yingchun; LIN Xuehui

doi:10.3724/SP.J.1140.2011.06065

2011 Vol. 31, No. 6

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REN Xiangwen, LIU Jihua, SHI Xuefa, CUI Yingchun, LIN Xuehui. GENESIS AND ORE-FORMING STAGES OF CO-RICH FERROMANGANESE CRUSTS FROM SEAMOUNT M OF MAGELLAN SEAMOUNTS: EVIDENCE FROM GEOCHEMISTRY AND CO CHRONOLOGY[J]. Marine Geology & Quaternary Geology, 2011, 31(6): 65-74. doi: 10.3724/SP.J.1140.2011.06065

Citation:

REN Xiangwen, LIU Jihua, SHI Xuefa, CUI Yingchun, LIN Xuehui. GENESIS AND ORE-FORMING STAGES OF CO-RICH FERROMANGANESE CRUSTS FROM SEAMOUNT M OF MAGELLAN SEAMOUNTS: EVIDENCE FROM GEOCHEMISTRY AND CO CHRONOLOGY[J]. Marine Geology & Quaternary Geology, 2011, 31(6): 65-74. doi: 10.3724/SP.J.1140.2011.06065

GENESIS AND ORE-FORMING STAGES OF CO-RICH FERROMANGANESE CRUSTS FROM SEAMOUNT M OF MAGELLAN SEAMOUNTS: EVIDENCE FROM GEOCHEMISTRY AND CO CHRONOLOGY

1 Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;
2 Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
3 Qingdao Institute of Marine Geology, Qingdao 266071, China

Received Date: 20 March 2011

Revised Date: 31 August 2011

Abstract

Abstract

17 Co-rich ferromanganese crusts from 9 sites at the Seamount M in the northwest of Magellan Seamounts were investigated geochemically with inductively coupled plasma atomic emission spectroscopy (ICP-AES) and weight method. Geochemical composition of those samples suggests that those Co-rich Fe-Mn crusts are hydrogenetic in origin and most of them were not phosphatized during formation. This paper extends the usage of Co chronology to bulk samples. The ages dated by the Co chronology suggest that those Co-rich Fe-Mn crusts mainly formed since Miocene, and one of them were phosphatized around 15 Ma when the oxygen minimum zone (OMZ), where the Co-rich Fe-Mn crust formed, immerged to the present water depth of 2 000~2 700 m.
- Co-rich ferromanganese crust /
- metallogeny /
- ore-forming epoch /
- Magellan Seamounts

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References

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