Role of Hydrology in the Formation of Co-rich Mn Crusts from the Equatorial N Pacific,Equatorial S Indian Ocean and the NE Atlantic Ocean |
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Authors: | Geoffrey P Glasby Bruce Mountain Theckethottathil C Vineesh Virupaxa Banakar Ramesh Rajani Xiangwen Ren |
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Institution: | 1. GNS Science, Wairakei Research Centre, Private Bag, Taupo, New Zealand and;2. National Institute of Oceanography, Dona Paula, Goa, India,;3. Marine Geology Division, First Institute of Oceanography, SOA, Qingdao, China |
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Abstract: | Co-rich Mn crusts from four different locations of the world ocean have been studied to understand the role of dissolved oxygen of the ambient seawater in the formation of Co-rich Mn crusts. WOCE (World Ocean Circulation Experiment) oxygen profiles of modern seawater in the Equatorial North Pacific Ocean, Equatorial South Indian Ocean and the North East Atlantic Ocean have been evaluated with respect to the occurrence of Co-rich Mn crusts at depths ranging from 1500 to 3200 m. The oxygen content at these depths varied from ~90–240 µmol/kg. The oxygen minimum zone (OMZ), with oxygen contents in the range ~45–100 µmol/kg, is located in the depth range 800–900 m in these regions. The age of the ocean crust on which seamounts formed is in the range 80.3–180 Ma. Profiles of the oxygen contents of seawater with depth in the oceans are shown to be extremely useful in establishing the optimum conditions for the formation of Co-rich Mn crusts. The use of WOCE oxygen profiles to study geochemical processes in the oceans is highly recommended. |
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Keywords: | Afanasiy-Nikitin Seamount Co-rich Mn crusts Eh-pH diagrams oxygen minimum zone WOCE profiles |
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