西藏南部晚白垩世厚壳蛤的锶同位素年龄标定

黄思静; 石和; 张萌; 武文慧; 沈立成; 黄成刚

Volume 30 Issue 4

Jul. 2005

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Article Navigation > Earth Science > 2005 > 30(4): 437-442

HUANG Si-jing, SHI He, ZHANG Meng, WU Wen-hui, SHEN Li-cheng, HUANG Cheng-gang, 2005. Strontium Isotope Age Calibration of Rudist Bivalves from Late Cretaceous Section in Southern Tibet. Earth Science, 30(4): 437-442.

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Strontium Isotope Age Calibration of Rudist Bivalves from Late Cretaceous Section in Southern Tibet

State Key Laboratory of Oil /Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2004-11-29
Publish Date: 2005-07-25

Abstract

Abstract

The direct numerical age calibration for sedimentary rocks is more difficult in sedimentology and stratigraphy. The long oceanic residence time of Sr (≈106 a) and the rapid mixing rate of the oceans (≈103 a) have caused the strontium isotope ratio of seawater to be globally homogeneous at any given time, as documented by identical ⁸⁷Sr/ ⁸⁶Sr ratios for coeval marine carbonates, and therefore, the ⁸⁷Sr/⁸⁶Sr ratios are the function of geological time which is the fundamental principle of strontium isotope stratigraphy (SIS) and the theoretical basis of dating marine sediments using SIS. In this paper, ⁸⁷Sr/ ⁸⁶Sr ratios of 4 rudist bivalves collected from a sedimentary section of the Late Cretaceous in the southern Tibet were measured. Based on the very low Mn/Sr ratio (average 0.01) of the samples, it is thought that they contain information on the original seawater strontium isotope composition. The ages of the fossils were calibrated according to the principle of strontium isotope stratigraphy. The 4 samples are located at 381, 362, 358 and 296 m, respectively, with the accumulation thickness in the section. Corresponding ⁸⁷Sr/ ⁸⁶Sr ratios are 0.707 832, 0.707 769, 0.707 768 and 0.707 695, respectively, and the ages calibrated are 65.68, 69.34, 69.39 and 72.32 Ma, respectively. The average error for dating by strontium isotope stratigraphy is approximately ±1 Ma. The research shows a potential value of SIS in dating marine rocks.
- southern Tibet,
- Late Cretaceous,
- rudist bivalve,
- strontium isotope stratigraphy,
- dating marine sediment

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References(39)

References

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Strontium Isotope Age Calibration of Rudist Bivalves from Late Cretaceous Section in Southern Tibet

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