| 内蒙古磴口河湖相沉积物正构烷烃分布特征及其环境意义 |
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| 引用本文： | 杨桂芳,武法东,陈正洪,尹雪锋,殷志刚,郭斌.内蒙古磴口河湖相沉积物正构烷烃分布特征及其环境意义[J].地球科学,2015,40(2):327-333. |
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| 作者姓名： | 杨桂芳 武法东 陈正洪 尹雪锋 殷志刚 郭斌 |
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| 作者单位： | 中国地质大学地球科学与资源学院,北京100083 2.中国气象局气象干部培训学院,北京100081 3.内蒙古巴彦淖尔地质公园管理局,内蒙古巴彦淖尔015000 |
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| 基金项目： | 国家自然科学基金项目(Nos.41002036,41172167,41320003)中央高校基本科研业务费专项资金优秀教师项目(No.2652014058)内蒙 古巴彦淖尔市国土资源局项目“河套地区(巴彦淖尔境内)近代高分辨率环境演化研究”中国博士后特别资助项目(No.2014T70059) |
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| 摘 要： | 为了探讨季风边缘区气候变化特征,对内蒙古磴口一个深15m 的钻孔沉积物中的正构烷烃进行了分析.结果显示,正
构烷烃总体呈现出以高碳数为主的分布特征,表明其主要来源于陆生高等植物,多数样品以nC27、nC29为主峰,奇碳优势明
显,局部样品以nC25为主峰,显示了流域植被类型为木本植物和少量水生植物.但在钻孔上部短链正构烷烃相对丰度较高,主
要以nC18为主峰,无明显的奇偶优势,反映了低等藻类生物增加.正构烷烃的分布特征在沉积钻孔中表现出的多阶段变化,与
岩性、有机碳同位素等变化相吻合,反映出研究区寒暖交替的气候条件.
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| 关 键 词： | 正构烷烃 分布特征 环境指示意义 古气候 气候变化 |
n-Alkane Distribution and Their Palaeoenvironmental Implications in Fluvial-Lacustrine Sediments in Dengkou,Inner Mongolia |
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| Yang Guifang,Wu Fadong,Chen Zhenghong,Yin Xuefeng,Yin Zhigang,Guo Bin.n-Alkane Distribution and Their Palaeoenvironmental Implications in Fluvial-Lacustrine Sediments in Dengkou,Inner Mongolia[J].Earth Science-Journal of China University of Geosciences,2015,40(2):327-333. |
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| Authors: | Yang Guifang Wu Fadong Chen Zhenghong Yin Xuefeng Yin Zhigang Guo Bin |
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| Abstract: | To characterize the palaeoclimatic variations in monsoon margin zone, n-alkane analyses are done on samples co11ect-
ed from one borehole of 15m in depth in Dengkou, Inner Mongolia. The results indicate that most samples are dominated by
high carbon, primarily nC27 and nC2g , presenting a significant odd-carbon advantage and terrestria1 origin. Severa1 samples with
a main peak of nC2.1 show the organic origin of partia1 aquatic plants. However, in the upper part of the borehole, short chain n-
alkanes are relatively abundant, mainly with,1C18 as the main peak and without obvious odd-even predominance, reflecting the
increased alga1 biomass. It is found that alternately cold and warm climatic conditions dominated the study area by various dis-
tributions of n-alkanes in sediments, inline withlitho1ogy and organic carbon isotope variations in this study. |
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| Keywords: | n-alkane distribution environmental implication palaeoclimate climate change |
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