CAJ | 학술논문

针对现阶段湖泊沉积物粒度特征研究中垂直剖面分层方法所存在的数学方法的不足,借鉴孢粉分带比较成熟的案例,应用有序聚类法中次序不变的特点,以柴达木盆地尕海湖DG02钻孔338个经激光粒度仪测试的样品为研究对象,在有序聚类的数学理论基础上,借助Tilia软件将湖泊沉积物垂直剖面进行分层.研究结果表明,柴达木盆地尕海湖地区环境演化大致经过4个阶段:冰消期晚期(3 109~3 454 cm)、早全新世(2 623~3 109 cm)、中全新世(1 114~2 623 cm)和晚全新世(50~1 114 cm).通过与孢粉结果及前人研究结果进行对比,有序聚类法分类结果与现有分析结果较为吻合,一些重要的干旱和湿润事件也与其他区域的冰芯、孢粉、历史文献等记录相一致,表明利用该方法进行粒度分带是科学合理的,具有较高的实用价值.
침대현계단호박침적물립도특정연구중수직부면분층방법소존재적수학방법적불족,차감포분분대비교성숙적안례,응용유서취류법중차서불변적특점,이시체목분지소해호DG02찬공338개경격광립도의측시적양품위연구대상,재유서취류적수학이론기출상,차조Tilia연건장호박침적물수직부면진행분층.연구결과표명,시체목분지소해호지구배경연화대치경과4개계단:빙소기만기(3 109~3 454 cm)、조전신세(2 623~3 109 cm)、중전신세(1 114~2 623 cm)화만전신세(50~1 114 cm).통과여포분결과급전인연구결과진행대비,유서취류법분류결과여현유분석결과교위문합,일사중요적간한화습윤사건야여기타구역적빙심、포분、역사문헌등기록상일치,표명이용해방법진행립도분대시과학합리적,구유교고적실용개치.
In modern researches on the grain-size characteristics of lake sediments,the methods of incertical dividing sediments grain-size have no rigorous mathematical theory to support. To resolve this omission,the case of pollen zonation was taken for reference. 338 samples measured by Mastersizer 2000 from DG02 core of Gahai lake in Qaidam Basin were studied. Considering the clustering results of sequential clusters did not change the sequence of samples,tilia software package was used to divide the dividing sediments grain-size. The research results indicated that the climatic changes could be divided into four stages as follows: late deglaciation(1 1324-10 290 a B.P.),early holocene(10 290-8 850 a B.P.),mid holocene(8 850-4 400 a B.P.)and late holocene(4 400-200 a B.P.). The climatic changes and the important events of dry and wet in Gahai area were coincident with other research results that used ice cores,pollen and other records of historical documents at home and abroad. It showed that this method in the dividing sediments grain-size had higher practical value in improving rationality and scientificalness.