三峡地区寒武纪—三叠纪古海水Sm/Nd变化特征: 来自牙形石的证据

周炼; 陈孝红; 李志宏; 刘勇胜; 张利

Volume 31 Issue 1

Jan. 2006

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Article Navigation > Earth Science > 2006 > 31(1): 136-142

ZHOU Lian, CHEN Xiao-hong, LI Zhi-hong, LIU Yong-sheng, ZHANG Li, 2006. Variational Characteristics of Sm/Nd Ratio in Cambrian-Triassic Paleoseawater from Three Gorges Area Conodont Evidence. Earth Science, 31(1): 136-142.

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Variational Characteristics of Sm/Nd Ratio in Cambrian-Triassic Paleoseawater from Three Gorges Area Conodont Evidence

1.
State Key Laboratory of Geological Processes and Minerol Resources, China University of Geosciences, Wuhan 430074
2.
Centre for Stratigraphy and Paleontology，China Geological Survey, Yichang 443003, China

Received Date: 2005-04-15
Publish Date: 2006-01-25

Abstract

Abstract

Conodonts have received extensive attention in terms of their potential as geochemical tracers, due to their precise stratigraphic age and high REE concentration as well as their relative resistance to diagenetic alternation. The ratios of Sm/Nd of paleoseawater from the Cambrian to the Triassic in the northern of the Yangtze craton were determined using the Isotope Dilution Mass Spectrometry method. The samples exhibit a large variation in Sm/Nd ratio (0. 108-0. 348). It shows that the temporal variability in Sm/Nd ratios of the seawater from the Cambrian to the Triassic is characterized by strongly correlated eustatic changes of sea level and submergence history of old continental in the Three Gorges area, corresponding to the previously published sedimentological and geochemical studies on these areas. In the other hand, the preliminary conclusion revealed that the submarine hydrothermal system (mantle flux) and the Emeishan mantle plume with higher Sm/Nd ratios, which were existing in the subarea adjacent to the Three Gorges area during the Phanerozoic, may likely influence the Sm/Nd values of contemporaneous seawater. It allows us to speculate that the Srn/Nd curve of paleoseawater constructed by using conodonts has a potentially wide range of applications in studies relating to the paleoenvironmental and regional tectonic event.
- Sm/Nd ratio,
- conodont,
- paleoenvironment,
- Yangtze craton.

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References(45)

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Variational Characteristics of Sm/Nd Ratio in Cambrian-Triassic Paleoseawater from Three Gorges Area Conodont Evidence

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