Molybdenum isotope composition from Yangtze block continental margin and its indication to organic burial rate

被引：10

作者：

Zhou L. ^{[1
]}

Huang J. ^{[1
]}

Archer C. ^{[2
]}

Hawkesworth C. ^{[2
]}

机构：

[1] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences

[2] Department of Earth Sciences, University of Bristol

来源：

Frontiers of Earth Science in China | 2007年 / 1卷 / 4期

基金：

中国国家自然科学基金;

关键词：

Ancient continental margin setting; Molybdenum isotopes; Organic carbon burial rate;

D O I：

10.1007/s11707-007-0051-0

中图分类号：

学科分类号：

摘要：

The paper presents the molybdenum isotope data, along with the trace element content, to investigate the geochemical behavior of authigenic Mo during long-term burial in sediments in continental margin settings of the Yangtze block, as well as their indication to the burial of original organic carbon. The burial rate of original organic carbon was estimated on the basis of the amount of sedimentary sulfur (TS content), whilst the carbon loss by aerobic degradation was estimated according to calculated Mn contents. On these points, the original organic carbon flux was calculated, exhibiting a large range of variation (0.17-0.67 mmol/m2/day). The strong correlation between sedimentary Mo isotope values and organic carbon burial rates previously proposed on the basis of the investigations on modern ocean sediments, was also used here to estimate the organic carbon burial rate. The data gained through this model showed that organic carbon burial rates have large variations, ranging from 0.43-2.87 mmol/m2/day. Although the two sets of data gained through different geochemical records in the Yangtze block show a deviation of one order of magnitude, they do display a strong correlation. It is thus tempting to speculate that the Mo isotope signature of sediments may serve as a tracer for the accumulation rate of original organic carbon in the continental margin sediments. © Higher Education Press and Springer-Verlag 2007.

引用

页码：417 / 424

页数：7

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