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邙土黄土岩石磁学研究表明 ,其岩石磁学性质与黄土高原的黄土基本一致 ,而古地磁学的研究表明其中未记录“L aschamp”事件。研究发现 ,样品加热到 30 0℃时的剩磁强度与其频率磁化率之间具有极好的相关性。以此为出发点 ,提出了邙山黄土剩余磁性的部分化学剩磁成因的认识。结合已有的研究成果 ,认为黄土剩余磁性由碎屑剩磁和化学剩磁叠加而成 ,它们对剩磁贡献的相对大小 ,可能决定了黄土 -古土壤磁性记录受“Smoothing”效应影响的程度 ;而其各自贡献的大小与成壤作用密切相关 ,成壤作用越强 ,化学剩磁的贡献相对就越大。解释了邙山黄土未能记录“L aschamp”事件的原因。并试图将这些认识推而广之 ,认为它们在黄土 -古土壤中可能具有普遍意义
Magnetism of Loess loess shows that its rock magnetism is basically the same as that of Loess Plateau, while paleomagnetic study shows that “L aschamp” event is not recorded. It is found that there is an excellent correlation between the remanence and the frequency susceptibility when the sample is heated to 300 ℃. Taking this as a starting point, this paper put forward the cognition of the genesis of the partial chemical remanence of the remaining magnetism in the Yanshan loess. According to the existing research results, it is considered that the residual magnetism of the loess is formed by superposition of remnant magnetism and chemical remanence, and the relative contribution of their contribution to remanence may determine the degree of influence of the “Smoothing” effect on the magnetic record of loess-paleosol ; While the contribution of their respective size is closely related to pedogenesis, the stronger the pedogenesis, the greater the contribution of chemical remanence. Explain why the Yushan loess failed to record “L aschamp” events. And attempt to widen these understanding, think they may have universal meaning in the loess - ancient soil