| 陆相断陷湖盆沉积物磁组构特征及环境意义--以泥河湾盆地为例 |
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| 引用本文： | 杨晓强,李华梅.陆相断陷湖盆沉积物磁组构特征及环境意义--以泥河湾盆地为例[J].海洋地质与第四纪地质,2000,20(3):43-52. |
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| 作者姓名： | 杨晓强 李华梅 |
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| 作者单位： | 中国科学院,广州地化所,广州,510640 |
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| 基金项目： | 中国科学院资助项目，49772139， |
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| 摘 要： | 选取陆相湖盆泥河湾盆地的郝家台和东谷坨两剖面，共取样２８６块，研究喾物磁组构参数特征及其环境意义。结果表明，沉积物磁组构参数的变化与沉积物粒度参数、磁化率的变化密切相关，蕴含着环境变化的信息。磁化率各向异性度（Ｐ）、磁线理（Ｌ）、沉积物磁化率的高值和细粒物质含量的低值指示湖水平面下降，气候较为干燥；相反，则说明湖水平面上升，气候较为湿润。据此，将泥河湾盆地沉积过程中湖水平面的变化过程划分为２个大的
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| 关 键 词： | 磁组构 沉积物粒度 泥河湾盆地 陆相 断陷湖盆 |
| 修稿时间： | 2000-03-17 |
MAGNETIC ANISOTROPY AND ITS ENVIRONMENTAL SIGNIFICANCE IN LIMNAL FAULTED BASIN-TAKING THE NIHEWAN BASIN AS AN EXAMPLE |
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| YANG Xiao-qiang,LI Hua-mei.MAGNETIC ANISOTROPY AND ITS ENVIRONMENTAL SIGNIFICANCE IN LIMNAL FAULTED BASIN-TAKING THE NIHEWAN BASIN AS AN EXAMPLE[J].Marine Geology & Quaternary Geology,2000,20(3):43-52. |
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| Authors: | YANG Xiao-qiang LI Hua-mei |
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| Abstract: | samples were collected from Haojiatai and Donggutuo sections in the Nihewan Basin to study the properties of magnetic anisotropy(AMS)and its environmental significance based on the fieldwork.The results show minima(maxima) in anisotropic magnitude(P),lineation(l)and magnetic susceptibility,and low(high)fraction of fine grain sediments coincides with high(low)lake level,warm(cold,dry)periods and retrogradation (progradation) of large detritus.The history of lake level change can be divided into two stages with fourteen substages.The first stage is a long cycle,and the second one is shorter and may be controlled by various climatic periods.The maximum axis of AMS spheroid is paralell to the direction of paleocurrent,and the inclination changes of maximum axis and minimum axis indicate whether or not the deposit is abnormal. |
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| Keywords: | magnetic anisotropy(AMS) sediment grain size paleocurrent lake level Nihewan Basin |
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