东濮凹陷古近系锶、硫、氧同位素组成及古环境意义

史忠生; 陈开远; 何生

Volume 30 Issue 4

Jul. 2005

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SHI Tei-sheng, CHEN Kai-yuan, HE Sheng, 2005. Strontium, Sulfur and Oxygen Isotopic Compositions and Significance of Paleoenvironment of Paleogene of Dongpu Depression. Earth Science, 30(4): 430-436.

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SHI Tei-sheng, CHEN Kai-yuan, HE Sheng, 2005. Strontium, Sulfur and Oxygen Isotopic Compositions and Significance of Paleoenvironment of Paleogene of Dongpu Depression. Earth Science, 30(4): 430-436.

SHI Tei-sheng, CHEN Kai-yuan, HE Sheng, 2005. Strontium, Sulfur and Oxygen Isotopic Compositions and Significance of Paleoenvironment of Paleogene of Dongpu Depression. Earth Science, 30(4): 430-436.

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Strontium, Sulfur and Oxygen Isotopic Compositions and Significance of Paleoenvironment of Paleogene of Dongpu Depression

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
School of Energy Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2004-12-15
Publish Date: 2005-07-25

Abstract

Abstract

Dongpu depression is a typical saline lake basin in the Bohai Bay region.Many sets of halites have been deposited in the Shahejie Formation of Paleogene, The genesis of halites and the paleoenvironment are considered, based on the study of strontium, sulfur and oxygen isotopic composition characteristics of the Paleogene halites.The research results are as follows: (1) The halites of Paleogene of Dongpu depression were formed form continental lake water and not from the invasion of sea water.The composition of strontium isotopes was mainly controlled by the silicon-aluminum rock with a higher value of ⁸⁷Sr/ ⁸⁶Sr(0.720±0.005); (2) The value of δ³⁴S((28-33) ×10^-3) of Paleogene halites of Dongpu depression was higher than that of the marine evaporate (20×10^-3), which indicates that the sedimentary environment was closed to sulfate and open to sulfurated hydrogen; (3) The variation of strontium and oxygen isotope compositions show that from the upper E_s4 to the upper E_s3 member, the paleoclimate was humid in the Dongpu depression, and rainfall gradually increased, which resulted in a decrease of δ¹⁸O and increase of ⁸⁷Sr/ ⁸⁶Sr; and from the upper E_s3 to the E_s1 member the paleoclimate became abruptly dry, which resulted in a decrease in rainfall and rapid evaporation.
- Dongpu depression,
- strontium, sulfur and oxygen isotope,
- paleoenvironment,
- saline-lake

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References

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