吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (2): 465-479.doi: 10.13278/j.cnki.jjuese.20190250
张新荣1,2,3, 平帅飞1,2,3, 焦洁钰1,2,3, 刘恩豪1
Zhang Xinrong1,2,3, Ping Shuaifei1,2,3, Jiao Jieyu1,2,3, Liu Enhao1
摘要： 深入了解松嫩平原第四纪古气候演化过程，对本区黑土退化的气候影响因素研究有重要理论意义。选择松嫩平原南缘大黑山地垒长春—四平段郭家（GJ）、湾沟（WG）、平安屯（PA）、腰分水岭旁（YP）、西地（XD）、胡家甸（H）、肖家（XJ）7个现代沉积剖面进行磁化率、粒度和色度分析。结果显示：各剖面沉积物磁化率多表现为干燥时期较大、湿润时期较小、寒冷阶段较大、温暖适宜阶段较小的特点。颜色对磁化率影响较大，不同颜色砂或砂质黏土的磁化率从大到小依次为红褐色→浅黄色或灰绿色→灰黑色。碳酸盐岩或灰岩物源的存在，使沉积物色度和磁化率之间的关系相对复杂。磁化率会随沉积物粒度增大而增大，冻融风化和降雨增多导致沉积物粒度增大，使磁化率升高；但温暖适宜时期，磁化率受物源供给量的减小而减小。磁化率、粒度和色度三指标综合反映出研究区早更新世寒冷干燥→中更新世冷湿—暖湿—冷湿→晚更新世寒冷较湿润的古气候环境演化过程。
中图分类号:
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