Discussion on the forming mechanism of columnar structure of cobalt-rich crusts

CUI Ying-chun; SHI Xue-fa; LIU Ji-hua; REN Xiang-wen; YIN Jing-wu; HAO Jin-hua

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CUI Ying-chun, SHI Xue-fa, LIU Ji-hua, REN Xiang-wen, YIN Jing-wu, HAO Jin-hua. Discussion on the forming mechanism of columnar structure of cobalt-rich crusts[J]. Haiyang Xuebao, 2008, 30(1): 74-79.

Citation:

CUI Ying-chun, SHI Xue-fa, LIU Ji-hua, REN Xiang-wen, YIN Jing-wu, HAO Jin-hua. Discussion on the forming mechanism of columnar structure of cobalt-rich crusts[J]. Haiyang Xuebao, 2008, 30(1): 74-79.

CUI Ying-chun, SHI Xue-fa, LIU Ji-hua, REN Xiang-wen, YIN Jing-wu, HAO Jin-hua. Discussion on the forming mechanism of columnar structure of cobalt-rich crusts[J]. Haiyang Xuebao, 2008, 30(1): 74-79.

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Discussion on the forming mechanism of columnar structure of cobalt-rich crusts

1.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Graduate School, Chinese Academy of Sciences, Beijing 100039, China
2.
Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
Geological Laboratory Center, China University of Geosciences(Beijing), Beijing 100083, China

Received Date: 2007-04-03
Rev Recd Date: 2007-06-12

Abstract

Abstract

Columnar structure is one of the microstructures in cobalt-rich crusts.In order to elucidate its forming mechanism, microsco pical features and microprobe element chemistries have been analyzed with a high-resolution backscattered electron probe microscope analyzer on the profile of a cobalt-rich crust from the Mid-Pacific Mountains.The results show that the columnar structure consists of the light microlayers (rich in manganese, cobalt, nickel and oxygen) and gray microlayers (rich in iron and silicon), in which they occuralter nately, and the growth rates of the same micro layer are different and range from 0.27 to 0.92 mm/Ma.The reasons for the diferent colours of microlayers and the component alternation could be the change of redox environments resulting in the different phases of mineral forming.The electrical double layer of growth interface of cobalt-rich crusts could explain the bifurcation of microlayers of columnar structure and the variations of growth ratios in the same microlayer.
- cobalt-rich crust,
- columnar structure,
- electrical double layer

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References(32)

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