Resource estimation of Co-rich crusts of seamounts in the three oceans

Zhang Fuyuan; Zhang Weiyan; Ren Xiangwen; Zhang Xiaoyu; Zhu Kechao

doi:10.3969/j.issn.0253-4193.2015.01.010

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Zhang Fuyuan, Zhang Weiyan, Ren Xiangwen, Zhang Xiaoyu, Zhu Kechao. Resource estimation of Co-rich crusts of seamounts in the three oceans[J]. Haiyang Xuebao, 2015, 37(1): 88-105. doi: 10.3969/j.issn.0253-4193.2015.01.010

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Zhang Fuyuan, Zhang Weiyan, Ren Xiangwen, Zhang Xiaoyu, Zhu Kechao. Resource estimation of Co-rich crusts of seamounts in the three oceans[J]. Haiyang Xuebao, 2015, 37(1): 88-105. doi: 10.3969/j.issn.0253-4193.2015.01.010

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Resource estimation of Co-rich crusts of seamounts in the three oceans

doi: 10.3969/j.issn.0253-4193.2015.01.010

1.
Key Laboratory of State Oceanic Administration for Submarine Sciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 310012, China
3.
Department of Eeosciences, Zhejiang University, Hangzhou 310027, China
4.
Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510760, China

Received Date: 2013-12-03
Rev Recd Date: 2014-01-16

Abstract

Abstract

Marine cobalt (Co)-rich ferromanganese crusts are important because they are potential mineral resources for Co,Ni,Cu,Mn and other metals,and the paleoenvironment signals have been stored in their stratigraphic layers. Compared with pelagic polymetallic nodules and hydrothermal deposits,the Co-rich crust has higher Co,Ni and Pt contents,which make it possible for commercial exploitation. Based on Chinese surveyed data for Co-rich ferromanganese crust on some seamounts in the western Pacific,we performed a series of detail studies on the distribution of Co-rich ferromanganese crust and parameter indexes for delineation of Co-rich ferromanganese crust resources on seamounts. Then,each seamount is endowed with the crust thickness according to its height and age of underlying ocean crust,and thereby we calculated the amount of dry crust resources in the three oceans(1 081.166 1~2 162.332 2)×10⁸ t and distributed areas of crusts on seamounts (3 039 452.14 km²). And,the area covered by Co-rich ferromanganese crusts on seamounts in the Pacific,Atlantic,and Indian Ocean is 2 123 087.12 km²,512 509.74 km² and 403 855.28 km²,respectively,and the dry Co-rich ferromanganese crust resources in the Pacific,Atlantic,and Indian Ocean are (513.244~1 026.488)×10⁸ t,(116.503 2~233.006 4)×10⁸ t and (81.484 9~162.969 8)×10⁸ t,respectively. The contents of manganese,cobalt,nickel,and copper in the Co-rich ferromanganese crusts on seamounts in three oceans are (138.848~277.696)×10⁸ t,(3.967 6~7.935 2)×10⁸ t,(2.793 6~5.587 2)×10⁸ t and (0.825 1~1.650 2)×10⁸ t,respectively. Based on analyzing the relationship among Co-contents,Co-fluxes and Co-crust thickness,the endowed crust thickness accounts for 6.10%~12.20% of the theoretical deductive thickness,which supports Ku's conclusion that the crusts were actually growing for 4% of their lifetime. The average of endowed thickness is 1.87 cm and the average of measured thickness is 1.77 cm of Co-rich ferromanganese crusts on seamounts in the Pacific,and the relative error between endowed thickness and measured thickness is 5.35%. Correspondingly,the relative error in Atlantic and Indian Ocean is 18.18% and 23.23%,respectively. It shows that the endowed value for crust thickness on seamounts in the Pacific is reasonable and the obtained resource amount may be reliable. Finally,this paper provides a new method for estimating the resource amount of Co-rich ferromanganese crust on seamounts in global deep-sea basins.
- three oceans,
- seamount,
- Co-rich ferromanganese crust,
- resource amount,
- estimation,
- evaluation of mineral resources

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References(48)

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