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

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• 作者：Yazhou Fu (1) (2)
  Jiantang Peng (1)
  Wenjun Qu (3)
  Ruizhong Hu (1)
  Xuefa Shi (4)
  Andao Du (3)
  
• 关键词：Co ; rich ferromanganese crust ; crust profile ; osmium isotopic composition ; Central Pacific
• 刊名：Chinese Science Bulletin
• 出版年：2005
• 出版时间：September 2005
• 年：2005
• 卷：50
• 期：18
• 页码：2106-2112
• 全文大小：646KB
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• 作者单位：Yazhou Fu (1) (2)
  Jiantang Peng (1)
  Wenjun Qu (3)
  Ruizhong Hu (1)
  Xuefa Shi (4)
  Andao Du (3)
  
  1. The Key Laboratory of Ore Deposit, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
  2. The Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China
  3. National Geological Analysis Center, Beijing, 100037, China
  4. The first Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China
  
• ISSN：1861-9541

文摘

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.