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

东濮凹陷古近系锶、硫、氧同位素组成及古环境意义

1.
中国地质大学资源学院，湖北武汉 430074
2.
中国地质大学能源学院，北京 100083

基金项目: 横向合作项目: “东濮凹陷盆地发育特征及其油气成藏机制研究”

详细信息

作者简介:
史忠生(1978-)，男，博士研究生，从事石油地质方面的研究.E-mail: shiluck@163.com

中图分类号: P59
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出版历程
- 收稿日期: 2004-12-15
- 刊出日期: 2005-07-25

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

摘要

摘要: 东濮凹陷是渤海湾地区一个典型的盐湖盆地，其古近系沙河街组发育多套盐岩.通过对古近系锶、硫、氧同位素组成特征的研究，讨论了古近系盐类沉积的成因及当时的古环境.研究表明: (1)东濮凹陷古近系的盐岩为陆相成因而并非来源于海水的侵入，其湖水锶同位素的主要控制因素为高⁸⁷Sr/⁸⁶Sr(0.720±0.005)的壳源硅铝质岩石；(2)东濮凹陷古近系盐岩中的δ³⁴S((28~33)×10^-3)普遍偏高且大于现代海相蒸发盐中的δ³⁴S(20×10^-3)，表明盐类形成时的沉积环境对硫酸盐是封闭的，而对H₂S是开放的；(3)锶和氧的同位素变化特征表明: 东濮凹陷在由E_s4上段向E_s3上段过渡时气候较为湿润，降雨量逐渐增大，导致δ¹⁸O的降低和⁸⁷Sr/⁸⁶Sr值的升高；而由E_s3上段向E_s1段过渡时，气候骤然变得干旱，导致降雨量减小，蒸发量增大.
- 东濮凹陷 /
- 锶、硫、氧同位素 /
- 古环境 /
- 盐湖
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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图 1 东濮凹陷构造分区简图

Fig. 1. Schematic map of structures in Dongpu depression

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图 2 不同层位⁸⁷Sr/⁸⁶Sr平均值特征

Fig. 2. Average value of ⁸⁷Sr/⁸⁶Sr of different layers

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图 3 不同层位δ³⁴S组成特征

Fig. 3. δ³⁴S composition character of different layers

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图 4 硫同位素的组成特征与层序发育特征的对应关系(陈发亮等，2000)

LST.低位体系域；TST.水侵体系域；HST.高位体系域；FSST.下降体系域

Fig. 4. Relationship between sulfur isotopic composition and sequence development

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图 5 不同层位氧同位素组成特征

Fig. 5. δ¹⁸O composition character of different layers

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表 1 不同层位⁸⁷Sr/⁸⁶Sr值的组成特征

Table 1. Composition character of ⁸⁷Sr/⁸⁶Sr of different layers

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