| 兴凯湖沉积物磁化率和色度反映的28kaBP以来区域古气候环境演化 |
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| 引用本文： | 吴健,沈吉.兴凯湖沉积物磁化率和色度反映的28kaBP以来区域古气候环境演化[J].海洋地质与第四纪地质,2009(3). |
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| 作者姓名： | 吴健 沈吉 |
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| 作者单位： | 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室;中国科学院研究生院; |
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| 基金项目： | 国家自然科学基金项目(40872117) |
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| 摘 要： | 对兴凯湖长269 cm的沉积岩心的研究结果显示:沉积物的色度和磁化率特征可以较好地反映区域气候环境变化。沉积物明度分别与红度、磁化率、黏土和有机质含量之间及磁化率与黏土之间有很好的相关性;红度高值与明度低值对应暖湿气候环境,磁化率低值反映沉积物较粗的较低湖面,对应冷干气候。28480~26160 cal.aBP,湖区处于温湿气候时期;22880~18170 cal.aBP,岩心孢粉浓度很低,流域处于末次盛冰期疏桦林草原环境;18170~12650 cal.aBP处于Bφlling/Older Dryas/Allerφd暖期。岩心深度90~78 cm段,对应于新仙女木期;11500~4570 cal.aBP,进入全新世暖期,其中8000~5000 cal.aBP,本区处于全新世大暖期(气候适宜期);4570~1470 cal.aBP气候变为凉干;1470 cal.aBP以来,流域又变为暖湿气候环境,同时,人类活动逐渐增强造成水土流失加剧。
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| 关 键 词： | 漫反射光谱 古气候环境 磁化率 兴凯湖 |
PALEOENVIRONMENTAL AND PALEOCLIMATIC CHANGES REFLECTED BY DIFFUSE REFLECTANCE SPECTROSCOPY AND MAGNETIC SUSCEPTIBILITY FROM XINGKAI LAKE SEDIMENTS |
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| WU Jian,SHEN Ji.PALEOENVIRONMENTAL AND PALEOCLIMATIC CHANGES REFLECTED BY DIFFUSE REFLECTANCE SPECTROSCOPY AND MAGNETIC SUSCEPTIBILITY FROM XINGKAI LAKE SEDIMENTS[J].Marine Geology & Quaternary Geology,2009(3). |
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| Authors: | WU Jian SHEN Ji |
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| Institution: | 1 State Key Laboratory of Lake Science and Environment;Nanjing Institute of Geography and Limnology;Chinese Academy of Sciences;Nanjing 210008;China;2 Graduate School;Beijing 100039;China |
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| Abstract: | The Xingkai Lake,a transboundary lake by China and Russia,is the largest freshwater lake in Northeast Asia.We used diffuse reflectance spectroscopy and magnetic susceptibility to characterize the sediments in a 269 cm long core from deepwater in the northern part of the lake.Redness in sediment is primarily related to wet-warm climate,which seems to monitor paleoclimatic changes in the area;brightness has a good correlation with magnetic susceptibility,clay,TOC and redness,and likewise,magnetic susceptibili... |
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| Keywords: | diffuse reflectance spectroscopy magnetic susceptibility lacustrine sediments Xingkai Lake Northeast China |
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