论文部分内容阅读
通过分析东居延海S1探坑剖面色素含量 ,结合碳酸盐、介形类化石、腐殖酸、磁化率及化学元素等多环境指标分析结果 ,探讨该区近 2 6 0 0年来环境气候波动特点。研究区气候变化大致经历几个阶段 :温暖湿润(2 6 5 0～ 2 5 6 0aB .P .)→湖泊菱缩 ,气候偏干暖 (2 5 6 0～ 2 36 0aB .P .)→暖湿气候背景下湖泊的扩张 (2 36 0～2 1 2 0aB .P .)→冷湿向冷干转换 ,湖泊由大湖开始菱缩 (2 1 2 0～ 1 6 0 0aB .P .)→气候暖湿 ,湖泊再次扩张 ,(1 6 0 0～ 6 5 0aB .P .)→湖泊由扩张到菱缩 ,气候由冷湿向暖干变化 (6 5 0aB .P .—至今 )。同时尝试把色素与其它指标的结合作为指示湖泊古初始生产力的有效性 ,以及识别沉积记录有关人类活动的可能性
Based on the analysis of the pigment content in the section S1 of the East Juyanhai sea and the analysis of multi-environmental indicators such as carbonate, ostracods, humic acid, magnetic susceptibility and chemical elements, the environmental climate Fluctuation characteristics. Climate change in the study area generally goes through several stages: warm and humid (2650 ~ 2560aB. P.) → laxation of the lake, warm partial warming (2560 ~ 236OaB .P.) → warm The expansion of lakes in the wet climate (2 36 0 ~ 2 120baB .P.) → cold-wet to cold-dry conversion, the lakes started to shrink in the Great Lakes (2120 ~ 1600baB.P.) → climate Warm and humid, the lake once again expanded, (1600 ~ 6500aB. P.) → lakes by the expansion to the Ling Shrink, the climate changes from cold and wet to warm and dry (650ab.P.-So far). At the same time, attempts have been made to combine the use of pigments with other indicators as an indicator of the effectiveness of initial productivity of paleokarst lakes and the possibility of identifying sedimentary records relating to human activities