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Os isotopic compositions of a cobalt-rich ferromanganese crust profile in Central Pacific

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Chinese Science Bulletin

Abstract

187Os/188Os ratios in all sub-layers of the Co-rich ferromanganese crust MP5D17 from Line Seamount in Central Pacific have been systematically determined. The 187Os/188Os values in this crust are highly variable, ranging from 0.4262 to 1.0155. From the bottom to the top, the osmium isotopic ratios of the crust display a regular variation trend, which correlates well with its changes in structure and texture in the vertical profile. In comparison with the evolution curve of Os isotopic composition in seawater over the past 80 Ma, a similar evolution tendency can be found with respect to the Os isotopic composition of the crust in this study. It is preliminarily concluded that the crust MP5D17 began to grow at about 72 Ma, and underwent three growth hiatuses, corresponding to the geological ages of 64, 53 and 37 Ma, respectively.

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Authors and Affiliations

  1. The Key Laboratory of Ore Deposit, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China

    Yazhou Fu, Jiantang Peng & Ruizhong Hu

  2. The Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China

    Yazhou Fu

  3. National Geological Analysis Center, Beijing, 100037, China

    Wenjun Qu & Andao Du

  4. The first Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China

    Xuefa Shi

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  1. Yazhou Fu
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Correspondence to Yazhou Fu.

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Fu, Y., Peng, J., Qu, W. et al. Os isotopic compositions of a cobalt-rich ferromanganese crust profile in Central Pacific. Chin.Sci.Bull. 50, 2106–2112 (2005). https://doi.org/10.1007/BF03322808

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