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MAGNETIC ANISOTROPY AND ITS ENVIRONMENTAL SIGNIFICANCE IN LIMNAL FAULTED BASIN-TAKING THE NIHEWAN BASIN AS AN EXAMPLE
Author(s): 
Pages: 43-52
Year: Issue:  3
Journal: MARINE GEOLOGY & QUATERNARY GEOLOGY

Keyword:  磁组构沉积物粒度湖水平面古水流方向泥河湾盆地;
Abstract: 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,研究沉积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个大的阶段,14个次级阶段.阶段Ⅰ变化周期较长,而阶段Ⅱ周期则较短,可能是由不同的气候周期所控制.而磁化率椭球体最大主轴的方向指示了盆地古水流方向,主轴倾角的变化说明了沉积过程是否异常.
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