| 海平面升降中的元素地球化学响应--以塔中地区奥陶纪为例 |
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| 引用本文： | 鲍志东,朱井泉.海平面升降中的元素地球化学响应--以塔中地区奥陶纪为例[J].沉积学报,1998,16(4):30-36. |
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| 作者姓名： | 鲍志东 朱井泉 |
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| 作者单位： | 1 石油大学地球科学系 北京 102200; |
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| 基金项目： | 国家“九五”科技攻关项目 |
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| 摘 要： | 海相岩石自生矿物中的锶同位素组成可反映其沉积时期的海平面波动趋势。塔中地区奥陶系87Sr／87Sr分析表明，在早奥陶世海平面总体呈下降趋势，而在中晚奥陶世海平面则持续上升并保持在奥陶纪平均海平面之上。氧同位素分析表明，塔中地区下奥陶统的白云岩主要为低海平面期高盐度环境沉积的准同生白云岩。微量元素分析结果支持同位素研究结论。分析测试表明，锶、氧同位素及一些微量元素均对海平面升降波动具有敏感的反应。
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| 关 键 词： | 海平面升降 同位素演化 负相关 塔里木盆地 |
| 收稿时间： | 1998-04-06 |
Isotope and Trace Element Evolution: Responding to Sea-level Fluctuation -An Example of Ordovician in Middle Tarim Basin |
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| Bao Zhidong,Zhu Jingquan,Jiang Maosheng,Xia Yong.Isotope and Trace Element Evolution: Responding to Sea-level Fluctuation -An Example of Ordovician in Middle Tarim Basin[J].Acta Sedimentologica Sinica,1998,16(4):30-36. |
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| Authors: | Bao Zhidong Zhu Jingquan Jiang Maosheng Xia Yong |
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| Institution: | 1 Petroleum University, Beijing 102200;2 Institue of Geology,Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The Strontium isotope composition of marine autogenetic minerals can reflect the sea level fluctuation trend during the minerals deposited. The analysis of the 87 Sr/ 86 Sr ratio of Ordovician shows the sea level dropped in Early Ordovician, and then rose continuously and stayed above the average level in Middle and Late Ordovician in middle Tarim area. The study of oxygen isotopes indicates the dolostones of the Lower Ordovician are mainly penecontemporaneous dolostones which deposited in the sedimentary environment of the high salinity of the lower sea-level. The trace elements geochemistry draws the same conclusion as that of the study of the isotope analysis. In brief, the variation trend of 87 Sr/ 86 Sr ratio was reversely interrelated with the sea level fluctuation. Both oxygen isotopes and some elements made remarkably response to the sea-level fluctuation during the Ordovician. |
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| Keywords: | sea level fluctuation isotopes evolution reverse interrelationship Tarim basin |
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