Estimation of the sources of pelagic sediments by sedimentation age

我们在2008年的研究是为了估算远洋沉积物的来源，对仪器中子活化分析和瞬发伽马射线分析测量的沉积物化学成分组成的数据矩阵进行了主成分分析(PCA)。主成分分析的结果代表了每个沉积物中的三因素模型，解释了沉积物总变化的58%-98%。陆源元素特征向量的比较表明存在两种来源。建议1组为陆相粉尘，2组为火山岩。沉积物K/Ti比值和Eu异常的变化支持上述结果。2009年，为了阐明上更新世至今南极斯科舍海和罗斯海的沉积环境，对南极海域沉积物进行了穆斯堡尔谱、仪器中子活化分析和X射线吸收近缘结构研究。在Scotia海沉积物的穆斯堡尔谱中，观察到一个特殊的双峰(同位素位移值为0.57-0.59 mms^-1&gt；，四极分裂为1.70-1.83 mms^&lt；-1&gt；)，表明原生海绿石是通过详细的物种形成而产生的。相比之下，罗斯海和南极洲周围另一个海域的沉积物岩心在穆斯堡尔谱中没有特定的峰。两种沉积物中铁和其他元素的含量几乎没有波动，即含铁形态的Scotia海沉积物中的沉积物质不受特定铁形态来源的影响，而受早期成岩作用等因素的影响。

Our study in 2008 is, in order to estimate the source in pelagic sediments, principal components analysis (PCA) was applied to the data matrix which was made by chemical compositions of sediments measured by instrumental neutron activation analysis and prompt gamma-ray analysis. The results of PCA represented 3-factor models in each sediment, explaining 58-98% of the total variations in the sediments. A comparison of eigenvectors of terrigenous elements indicated the existence of 2 sources. Group 1 is suggested to be continental dust, whereas Group 2 is suggested to be volcanic rock. Variation of K/Ti ratio and Eu anomaly of sediments supported the above results. In 2009, to elucidate the environment of sedimentation in the Scotia and Ross Seas in the Antarctic Ocean during the period from upper Pleistocene to the present, sediments from the seas were investigated by ^<57>Fe Mossbauer spectroscopy, instrumental neutron activation analysis and X-ray absorption near-edge structure. In Mossbauer spectra of Scotia Sea sediment, a specific doublet peak (isomer shifts of 0.57-0.59mms^<-1>, quadrupole splitting of 1.70-1.83mms^<-1>) was observed, suggesting the generation of primary glauconite by detailed speciation. In contrast, sediment cores from the Ross Sea and another sea area around Antarctica had no specific peak in Mossbauer spectra. Concentrations of iron and other elements in both sediments hardly fluctuated, that is, sedimentation matter in the Scotia Sea sediments containing iron species was not affected by the origin of specific iron species but by factors such as early-stage diagenesis.