罗马尼亚Mircea Voda剖面黄土粒度特征及其成因指示

Grain-Size Characteristics and Origin of the Mircea Voda Loess in Romania

中文关键词:  罗马尼亚  Mircea Voda黄土剖面  粒度特征  风成成因  沉积物

英文关键词:Romanian  Mircea Voda Loess  Grain size features  Aeolian origin  Sediments

中文摘要:

      Mircea Voda剖面是欧洲典型的黄土剖面之一,本文对Mircea Voda黄土剖面序列S₀-S₃进行了系统的粒度分析,并与中国黄土高原典型的黄土剖面洛川剖面、西峰剖面等进行了对比研究。结果显示,黄土粒度组成以粒径为4 μm-63 μm粉砂为主,其平均含量为78.22%,呈现出风成成因的基本特征,且不同深度样品的粒度组成具有较高的均一性,显示该区黄土具有相同的物质来源。粒度频率曲线呈现为以突出的第一众数20 μm~35 μm,分选较好的单峰正偏态分布特征,说明粉尘在沉积之前经过了充分的混合。粒级主要组分集中在粗粒端,但在细粒端1 μm附近存在第2个分量,这种特征与中国黄土高原黄土的粒度特征十分相似。计算得沉积物环境判别参数Y值均小于-2.741 1,通过与水成沉积物判别值Y的比较,进一步证实了Mircea Voda剖面黄土为风成成因特征。

英文摘要:

      The Mircea Voda Loess paleosol sequence is one of the typical loess paleosol sequences in Europe. In the present work, the loess sequence of S₀-S₃ in Mircea Voda loess is carried out and compared with the typical loess sequence of the Loess Plateau of China, such as the Luochuan loess-paleosol sequence, the Xifeng loess-paleosol sequence.The results show that the main grain size is 4 μm~63 μm, and the average content is 78.22%, which show the basic characteristics of aeolian origin and the grain sizes of different depth samples are very similar, indicating that the loess has the same source. The grain size frequency curve appears as a prominent mode of 20 μm~35 μm, indicating that the dust has been fully mixed before deposition. The main components of the grain size are concentrated in the coarse grain, but there is a second small mode near the fine grain about 1 μm. This characteristic is very similar to the grain size characteristics of the Loess Plateau in China.The sediment environment discriminant Y value is less than -2.741 1, and through compare with the water origin sediment discriminant Y value is further confirmed that the Mircea Voda loess is characterized by eolian origin.