| 中国东北地区晚二叠世岩相古地理特征 |
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| 引用本文： | 曲希玉,张满利,刘立,王德海,邱隆伟.中国东北地区晚二叠世岩相古地理特征[J].古地理学报,2013,15(5):679-692. |
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| 作者姓名： | 曲希玉 张满利 刘立 王德海 邱隆伟 |
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| 作者单位： | 1.中国石油大学(华东)地球科学与技术学院, 山东青岛266580;2.吉林大学地球科学学院, 吉林长春130061 |
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| 基金项目： | 国家自然科学基金项目(编号:41372133);国家科技重大专项(编号:2011ZX05009-002);高等学校博士学科点专项科研基金项目(编号:20090061120043);中央高校基本科研业务费专项资金(编号:12CX04004A)联合资助 |
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| 摘 要： | 在6条野外实测剖面和38条收集剖面的基础上, 通过剖面的岩石组合特征及样品的元素地球化学分析, 对中国东北地区晚二叠世的沉积环境和古地理特征进行了研究。结果显示, 东北地区上二叠统样品常量元素具有高Si、Al, 低P、Mn、Ca的特点；微量元素具有高V、Rb、Zr、Ba, 低Be、Mo、Cd、Ta和U的特点；稀土元素表现为轻、重稀土分异显著, 轻稀土相对富集, Eu负异常的特征。沉积环境主体为陆相淡水还原环境；存在北部、东部和西部3个物源, 其中北部和东部为主要物源方向；发育三角洲相、扇三角洲相和湖泊相沉积。此外, 林西组底部样品在常量、微量及稀土元素的异常和杨家沟组底部大量碳酸盐岩砾石的出现, 说明晚二叠世初期局部有海侵发生。中国东北地区晚二叠世沉积初期为海陆交互环境, 主体为陆相湖泊沉积环境。
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| 关 键 词： | 中国东北地区 晚二叠世 古地理 微量元素 湖泊相 |
| 收稿时间： | 10 March 2013 |
Lithofacies palaeogeography characteristics of|the Late Permian in Northeast China |
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| Qu Xiyu;Zhang Manli;Liu Li;Wang Dehai;Qiu Longwei.Lithofacies palaeogeography characteristics of|the Late Permian in Northeast China[J].Journal of Palaeogeography,2013,15(5):679-692. |
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| Authors: | Qu Xiyu;Zhang Manli;Liu Li;Wang Dehai;Qiu Longwei |
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| Institution: | 1.School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong;2.College of Earth Sciences, Jilin University, Changchun 130061, Jilin |
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| Abstract: | Based on 6 measured sections and 38 collected sections, the sedimentary environment and palaeogeographic features of the Late Permian in Northeast China were studied by means of rock association characteristics and element geochemical analysis of the samples. The results showed that the Upper Permian samples exhibited the features with high constant elements including Si, Al and low constant elements including P, Mn, Ca; trace elements with high content of V, Rb, Zr, Ba, Be, Mo, and low content of Cd, Ta, U. Rare earth elements performance showed|significant differentiation|and light rare earth elements were relative enrichment, but Eu was negative anomaly. The main sedimentary environment was reducing continental freshwater environment. And there were three provenances, including northern, eastern and western, the former two of which were the main provenances where developed sediments of delta facies, fan delta facies and lacustrine facies. In addition, abnormality in constant, trace and rare earth elements of the samples at the bottom of Linxi Formation and a large number of carbonate gravels at the bottom of Yangjiagou Formation both demonstrate and appearance of transgression in local area of the beginning of|Late Permian. In summary in Northeast China was marked by the alternation of continental and marine facies and the main sedimentary environment was continental lacustrine in the early Late Permian. |
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| Keywords: | Northeast China Late Permian palaeogeography trace elements lacustrine facies |
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