长江口氧化还原敏感元素的早期成岩过程

邹建军; 石学法; 李乃胜; 刘季花; 朱爱美

doi:10.3799/dqkx.2010.004

Volume 35 Issue 1

Jan. 2010

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ZOU Jian-jun, SHI Xue-fa, LI Nai-sheng, LIU Ji-hua, ZHU Ai-mei, 2010. Early Diagenetic Processes of Redox Sensitive Elements in Yangtze Estuary. Earth Science, 35(1): 31-42. doi: 10.3799/dqkx.2010.004

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ZOU Jian-jun, SHI Xue-fa, LI Nai-sheng, LIU Ji-hua, ZHU Ai-mei, 2010. Early Diagenetic Processes of Redox Sensitive Elements in Yangtze Estuary. Earth Science, 35(1): 31-42. doi: 10.3799/dqkx.2010.004

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Early Diagenetic Processes of Redox Sensitive Elements in Yangtze Estuary

doi: 10.3799/dqkx.2010.004

ZOU Jian-jun^{1, 2, 3
,},
SHI Xue-fa^{2
,
,},
LI Nai-sheng¹,
LIU Ji-hua²,
ZHU Ai-mei²

1.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
Graduate University, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2009-05-10
Publish Date: 2010-01-01

Abstract

Abstract

The major factors that govern the vertical distributions of redox sensitive elements (Fe, Mn, U and Mo) in interstitial water are studied by analyzing the measurement of concentrations of Fe, Mn, U and Mo in pore water and sediments in Yangtze estuary, combining with the early diagenesis model and geochemical thermodynamic analysis, The benthic fluxes of Fe, Mn, U and Mo have been calculated according to the Fick's first law. The results show that the concentrations of Fe, Mn, U and Mo in interstitial water in Yangtze Estuary sediments range from 0.8 to 106μmol/L, 14.8 to 258μmol/L, 1.9 to 14.4nmol/L and 60 to 546nmol/L, respectively. The maximum of interstitial Fe²⁺ and Mn²⁺ have been observed at 5cm or 10cm in the vertical profiles, respectively. The interstitial iron and manganese profiles are mainly controlled by early diagenetic processes in Yangtze Estuary sediments. Adsorption process has great effect on the distribution of interstitial Fe²⁺ and Mn²⁺. The greater the adsorption coefficients are, the less the concentrations of interstitial Fe²⁺ and Mn²⁺ are. The vertical distributions of interstitial uranium are mainly controlled by iron. However, there is no correlation between Mo and Fe or Mn. The calculated diffusive fluxes of Fe, Mn, U and Mo range from 3 to 10.5μmol·(m²·d)^-1, 35.7 to 439.5μmol·(m²·d)^-1, -2.3 to 0.2nmol·(m²·d)^-1 and -36 to 94.6nmol·(m²·d)^-1, respectively. The ratio of authigenic uranium to total uranium ranges from 6% to 67%.
- redox sensitive elements,
- early diagenesis,
- Yangtze Estuary,
- geochemistry

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References(58)

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Early Diagenetic Processes of Redox Sensitive Elements in Yangtze Estuary

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