本文關(guān)鍵詞： 湖泊沉積物 粉塵 現(xiàn)代過程 粒度 粗粉砂組分　出處：《中國沙漠》2017年02期 　論文類型：期刊論文

【摘要】：湖泊粉塵記錄是研究區(qū)域大氣粉塵演化歷史的重要載體,而現(xiàn)代過程研究是定量提取湖泊沉積物中粉塵信號的重要基礎。對山西公海湖泊沉積巖芯樣品及周邊不同類型的表土樣品開展了粒度分析,并對巖芯樣品進行粒度組分的定量分離。結(jié)果表明:全新世湖泊巖芯樣品以黏粒(2μm)、細粉砂(2~19μm)和粗粉砂(19~78μm)為主,粗粉砂組分的粒度特征與湖泊沉積物中的石英顆粒、黃土樣品中的粗粒組分及現(xiàn)代大氣降塵的粒度特征相似,石英顆粒的表面微形態(tài)也具有典型風成特征。因此,公海湖泊沉積物中粒徑19~78μm的粗粉砂組分可用來代表大氣粉塵的變化,這與湖泊沉積物中粗粉砂組分是大氣塵暴降塵主要組分的認識一致。另外,公海湖泊冰面粉塵樣品的平均粒徑還具有從西北向東南遞減的趨勢,表現(xiàn)出與冬季風方向一致的特征,進一步表明公海湖泊沉積物中粗粉砂組分可以代表東亞冬季風強度的變化。因此,公海湖泊巖芯中的粗粉砂組分可用來重建全新世大氣粉塵變化以及可能的東亞冬季風強度演化歷史。
[Abstract]:Lacustrine dust record is an important carrier to study the evolution history of atmospheric dust in the region. Modern process research is an important basis for quantitatively extracting dust signals from lake sediments. Grain size analysis is carried out on core samples of lake sediments in the high seas of Shanxi Province and different types of surface soil samples around them. The results showed that the core samples of Holocene were mainly composed of 2 渭 m of clay, 219 渭 m of fine silt and 1978 渭 m of coarse silt. The composition of coarse particles in loess samples and the particle size characteristics of modern atmospheric dust fall are similar, and the surface micromorphology of quartz particles also has typical wind characteristics. The coarse silt fraction of 1978 渭 m in the sediments of high seas lakes can be used to represent the variation of atmospheric dust, which is consistent with the understanding that the coarse silt component in lake sediments is the main component of dust control in atmospheric dust storm. The average particle size of the high seas lake ice dust samples also decreased from northwest to southeast, showing the same characteristics as winter monsoon. It is further indicated that the coarse silt composition in the sediments of the high seas lakes can represent the variation of the intensity of the East Asian winter monsoon. The coarse silt components in the high seas lake core can be used to reconstruct the Holocene atmospheric dust variation and possibly the history of the East Asian winter monsoon intensity evolution.
【作者單位】： 蘭州大學資源環(huán)境學院/西部環(huán)境教育部重點實驗室;
【基金】：國家自然科學基金項目(41372180) 國家基礎科學人才培養(yǎng)基金項目(J1310036)
【分類號】：P512.2;P425.55

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