| 碳、氧、锶同位素在羌塘盆地龙尾错地区层序地层研究中的应用 |
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| 引用本文：刘建清,贾保江,杨平,陈玉禄,彭波,李振江.2007.碳、氧、锶同位素在羌塘盆地龙尾错地区层序地层研究中的应用[J].地球学报,28(3):253-260. |
| DOI：10.3975/cagsb.2007.03.03 |
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| 基金项目:国家油气专项(编号:XQ2004-06) |
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| 中文摘要:结合野外露头层序地层研究,探讨了羌塘盆地龙尾错地区中上侏罗统地层层序地层划分及其C、O、Sr同位素响应.认为自中侏罗统布曲组(J2b)-上侏罗统雪山组一段(J3xs1)可划分出三个三级层序.其中布曲组-索瓦组二段下部,C、O、Sr同位素在同一层序内呈有规律变化:在TST体系域内δ13C、δ18O、87Sr/86Sr均值较高,在纵向变化曲线上表现为正偏,而在HST体系域内表现为相对的负偏.其纵向上的三次明显正偏与负偏可分别对应于三次海底的停滞与扩张.文章同时分析了个别异常样品的数据特征及其成因. |
| 中文关键词:中、上侏罗统 C、O、Sr同位素 层序地层 羌塘盆地 |
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| The Application of Carbon, Oxygen and Strontium Isotopes to the Study of Middle-Upper Jurassic Sequence Stratigraphy in Longweicuo Area, Qiangtang Basin |
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| Abstract:Based on an analysis of outcrops in Lonweicuo area, this paper deals with the Middle-Late Jurassic sequence stratigraphy and the responses of carbon, oxygen and strontium isotopes. The strata can be divided into three 3rd-grade sequences from Buqu Formation to 1st Member of Xueshan Formation, with δ13C, δ18O and 87Sr/86Sr changing regularly from TST to HST. The averages of δ13C, δ18O and 87Sr/86Sr are relatively high in TST and show positive characteristics on the longitudinal curve, which is opposite to things of HST in the same sequence from Buqu period to late Suowa period. The three distinct positive and negative excursions corresponded to three times of sea-floor spreading and stagnation. A few abnormal data are also analyzed in this paper. |
| keywords:Middle- Upper Jurassic C, O, Sr isotopes sequence stratigraphy Qiangtang basin |
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