| 羌塘盆地雁石坪地区中-晚侏罗世碳、氧同位素特征与沉积环境分析 |
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| 引用本文： | 谭富文,王剑,王小龙,杜佰伟.羌塘盆地雁石坪地区中-晚侏罗世碳、氧同位素特征与沉积环境分析[J].地球学报,2004,25(2):119-126. |
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| 作者姓名： | 谭富文 王剑 王小龙 杜佰伟 |
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| 作者单位： | 国土资源部成都地质矿产研究所，成都，610082;国土资源部成都地质矿产研究所，成都，610082;国土资源部成都地质矿产研究所，成都，610082;国土资源部成都地质矿产研究所，成都，610082 |
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| 基金项目： | 国土资源部国际合作与科技司“十五”重大基础研究项目(编号:20010208) |
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| 摘 要： | 通过对雁石坪地区中-上侏罗统碳酸盐岩的碳、氧同位素组成特征分析，认为其原始组分保存良好。在垂向上，碳、氧同位素的变化与沉积相演化和海平面曲线相吻合，说明它们与沉积环境的演化密切相关。结合碳、氧同位素的环境效应分析，认为中侏罗世雀莫错期沉积水体主要以陆源淡水作用为主，沉积环境属陆缘近海湖；布曲期为广海碳酸盐台地环境；夏里期为三角洲-淡化泻湖-潮坪环境。晚侏罗世索瓦早期为高盐度、高水温，相对局限浅海碳酸盐台地环境。中侏罗世至晚侏罗世早期经历了一次完整的海侵-海退旋回和一次海侵过程。
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| 关 键 词： | 碳同位素 氧同位素 羌塘盆地 雁石坪 侏罗系 |
Analysis of Carbon and Oxygen Isotope Composition and Sedimentary Environment of the Yanshiping Area of the Qiangtang Basin in Middle-Late Jurassic |
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| TAN Fu-wen,WANG Jian,WANG Xiao-long and DU Bai-wei.Analysis of Carbon and Oxygen Isotope Composition and Sedimentary Environment of the Yanshiping Area of the Qiangtang Basin in Middle-Late Jurassic[J].Acta Geoscientia Sinica,2004,25(2):119-126. |
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| Authors: | TAN Fu-wen WANG Jian WANG Xiao-long and DU Bai-wei |
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| Institution: | Chengdu Institute of Geology and Mineral Resources, Chengdu, Sichuan 610082;Chengdu Institute of Geology and Mineral Resources, Chengdu, Sichuan 610082;Chengdu Institute of Geology and Mineral Resources, Chengdu, Sichuan 610082;Chengdu Institute of Geology and Mineral Resources, Chengdu, Sichuan 610082 |
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| Abstract: | An analysis of C and O isotopic compositions of Middle-Upper Jurassic carbonates demonstrates that the original components of the carbonates have been well preserved. Their variations are consistent with the sedimentary facies and the sea level curve,showing a good response to the sedimentary environment. Based on an analysis of the response,the authors have reached some conclusions.In Middle Jurassic Quemocuo period,the sedimentary environment was an offshore terrigenous fresh water lake. In Middle Buqu period,there was an open sea carbonate plateau.In Middle Jurassic Xiali period,the marine delta plain,coastal fresh lagoon and tidal flat existed.In the early Suowa period of Late Jurassic,the environment was a localized sea carbonate plateau.There existed a transgressive-regressive cycle and a transgressive cycle from the Middle Jurassic to the early period of Late Jurassic. |
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| Keywords: | carbon oxygen isotope Qiangtang basin Yanshiping Jurassic sedimentary environment |
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