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采用电感耦合等离子体质谱仪(Q-ICP-MS)测试了成都金沙遗址河流相沉积物微量元素质量分数,并通过对微量元素质量分数和比值特征及其与粘粒、铁游离度和有机质等的相关性分析,探讨了微量元素特征对环境变化的指示意义.结果表明:Ba,Cr,Zr,Sr质量分数和Ba/Nb,Rb/Sr,Ba/Sr比值可用于指示沉积物源区环境的变化;龙门山及成都平原地区近3 400年以来的气候变化趋势为温暖湿润—温暖潮湿—温和偏干.沉积物微量元素特征分析与前人利用矿物、磁化率和孢粉分析手段的研究结果一致,揭示了古气候和古环境演变历史.
The microelement mass fraction of river sediment in the Jinsha site of Chengdu was measured by inductively coupled plasma mass spectrometry (Q-ICP-MS), and the characteristics of microelement mass fraction and ratio and its correlation with clay, iron freeness and organic matter The results indicate that the mass fraction of Ba, Cr, Zr and Sr and the ratios of Ba / Nb, Rb / Sr and Ba / Sr can be used to indicate the environment of sedimentary source The trend of climate change in Longmenshan and Chengdu Plain over the past 3 400 years is warm and humid-warm and humid-moderately dry and dry. The analysis of trace elements in sediments and the previous studies on the use of minerals, magnetic susceptibility and sporopollen analysis The results are consistent, revealing the history of paleoclimate and paleoenvironment evolution.