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新疆黄土-古土壤序列环境磁学参数的变化机理及其气候意义仍存在争议.本文选择天山北麓的中梁黄土剖面,系统开展了低温和常温下环境磁学参数的测试与研究,测量包括室温的磁化率与饱和磁化强度,以及磁化率与饱和剩余磁化强度的低温变化.结果发现,该剖面黄土和古土壤样品的磁性矿物主要由磁铁矿与磁赤铁矿组成,不含任何粒级成壤形成的超顺磁矿物颗粒,其磁化率信号主要记录了粉尘磁性矿物含量变化,较高的磁化率指示较强的风动力状况或者较近的风尘源区,新疆黄土的这种环境磁学“风尘输入模式”可用来重建干旱区的风动力强弱变化.
The changing mechanism of environmental magnetic parameters of loess-paleosol sequence in Xinjiang and its climatic significance are still in dispute.We selected the loess section of Zhongliang at the northern foot of Tianshan Mountain, and systematically tested and studied the environmental magnetic parameters at low temperature and ambient temperature. The measurements include Magnetic susceptibility and saturation magnetization at room temperature, and low temperature changes of magnetic susceptibility and saturation remanent magnetization.It is found that the magnetic minerals in the loess and paleosol samples of this section are mainly composed of magnetite and maghemite and do not contain any grain Level of super-paramagnetic minerals formed into the soil, the magnetic susceptibility signal mainly recorded changes in the content of dust magnetic minerals, higher magnetic susceptibility indicates strong wind dynamic conditions or more dust source areas, Xinjiang Loess this environment Magnetism “dust input mode” can be used to rebuild the wind power changes in arid areas.