【摘要】：黃土的粒徑對于反映古季風(fēng)強(qiáng)度變化、物源區(qū)環(huán)境變遷和黃土沉積后改造作用等具有重要的意義。中國東部寧鎮(zhèn)地區(qū)位于東亞冬、夏季風(fēng)交匯地帶,在晚第四紀(jì)普遍發(fā)育下蜀黃土,它是研究東亞氣候及季風(fēng)演化的良好載體。對南京周家山、鎮(zhèn)江W山典型下蜀黃土剖面進(jìn)行了系統(tǒng)的粒度特征分析,結(jié)果表明下蜀黃土風(fēng)塵沉積是由"近源"粗顆粒物質(zhì)和"遠(yuǎn)源"細(xì)顆粒物質(zhì)共同作用的產(chǎn)物。周家山剖面粒度組分含量變化記錄指示了下蜀黃土所經(jīng)歷的古氣候環(huán)境較之西北黃土更為暖濕,經(jīng)歷了較之更強(qiáng)的后期風(fēng)化成壤作用,大致上經(jīng)歷了2次完整的干冷-暖濕氣候旋回。
[Abstract]:The size of loess is of great significance to reflect the change of paleo monsoon intensity, the environmental change of provenance and the transformation of loess after sedimentation. The Ningzhen area in eastern China is located at the intersection of East Asian winter and summer monsoon. Xiashu loess was widely developed in the late Quaternary. It is a good carrier for studying the evolution of East Asian climate and monsoon. The grain size characteristics of typical Xiashu loess profiles in Zhoujiashan, Zhenjiang and Zhenjiang are analyzed systematically. The results show that the aeolian dust deposition of Xiashu loess is the result of the interaction of "near source" coarse granular material and "distant" fine granular material. The change of grain size component content in Zhoujiashan section indicates that Xiashu loess experienced more warm and wet paleoclimate environment than northwest loess, and experienced stronger weathering and soil formation in late stage. It has experienced two complete dry-cold-warm-wet climate cycles.
【作者單位】： 華東師范大學(xué)地理科學(xué)學(xué)院地理信息科學(xué)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(J1310028;41371032)
【分類號】：S151.9

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