【摘要】 通过对德令哈盆地尕海DG03孔岩芯的岩性、年代数据分析以及与可鲁可湖HL05-2孔岩芯多个气候代用指标的综合对比,确定了DG03孔岩芯的底部年龄约为11ka BP(AMS1-4C)。根据岩性变化,整个岩芯可划分为3个阶段:晚冰期晚期(11—10 ka BP),全新世早中期(10—4 ka BP)和全新世晚期(4—0 ka BP)。岩芯记录了晚冰期晚期和整个全新世的古气候和古环境变化信息,从晚冰期晚期以来,尕海湖经历了冷干—暖干—暖湿—冷干(现代)的气候变化过程,而湖泊水位则相应为低(盐湖或高盐度湖泊)—较高(盐湖—咸水湖)—高(咸水湖—半咸水湖/淡水湖)—较低(咸水湖—盐湖)。更多还原

【Abstract】 By analyzing the lithologies and dating data of DG03 core of Gahai Lake in Delingha Basin,comprehensively comparing with the climatic proxies of HL05-2 core in Hurleg Lake,the age on the bottom of DG03 core is defined to about 11ka BP(AMS-14C).According to the lithologies,the whole core is divided three parts: the late stage of Late Glacial(11—10ka BP),the Early and Middle Holocene(10—4ka BP),and the Late Holocene(4ka BP—0).The core recorded the palaeoclimatic and palaeoenvironmental information from the late stage of Late Glacial period and Holocene to present.Gahai Lake experienced a process of cold and dry—warm and dry—warm and wet—cold and dry since the last stage of Late Glacial.Correspondingly,the water level of the lake exhibited the changes of low(saline lake or high salinity lake period)—higher(saline lake to salty water lake period)—high(salty water lake to brackish or fresh water lake period)—lower(salty water lake to saline lake).更多还原