柴达木盆地尕海湖区冰消期晚期以来的气候环境演变  

Climatic-environmental evolution in Gahai Lake area of Qaidam Basin since Late Last Deglacial Period

作　　者：陈忠[1,2] 马海州[3] 曹广超[3,4,5] 张西营[3] 周笃珺[3] 姚远[6,7] 谭红兵[3] 高章洪[3] 

机构地区：[1]昆明理工大学国土资源工程学院 [2]中国科学院青海盐湖研究所,青海西宁810008 [3]中国科学院青海盐湖研究所 [4]中国科学院研究生院,北京100049 [5]青海师范大学生命与地理科学学院,青海西宁810008 [6]中国科学院研究生院 [7]中国科学院南京地理与湖泊研究所,江苏南京210008

出　　处：《地球化学》2007年第6期578-584,共7页Geochimica

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-SW-118)

摘　　要：通过对柴达木盆地东部尕海湖沉积物碳酸盐含量、自生碳酸盐碳氧同位素等指标的综合分析,建立了尕海湖地区自冰消期晚期以来的气候环境演变特征。结果表明,冰消期(12710～11360aB.P.)气候环境变化较大;进入全新世(自11360aB.P.开始)后,早全新世(11360～8370aB.P.)气候波动明显,整体较为干旱,温度有所回升;中全新世(8370～3200aB.P.),早期为湿润气候环境,是全新世气候环境最稳定的阶段,晚期气候环境仍较湿润,但环境条件变差;在晚全新世(3200aB.P.以来),早期湖泊水体仍然较淡,但气候环境明显趋向干旱,后期气候变得干旱,气候环境存在波动变化。约1500aB.P.存在一次湿润事件。Gahai Lake in Qaidam Basin is a closed lake, and is therefore a good site to study paleoclimate. Based on the analyses of carbonate content, oxygen and carbon stable isotope compositions ＂of authicarbonate in Core DG03, which is about 35 m in depth and drilled from Gahai Lake, a climatic-environmental evolution since the late Last Deglacial Period is constructed. The results show that the change in climate and environment was large during the late Last Deglacial Period. During the early Holocene （11360 - 8370 a B. P. ）, it was arid and became warm, but with a distinct fluctuation of climate. The mid-Holocene was wet, with stable climatic environment in the early period （8370-5390 a B.P. ）, and then cool but humid in the late period （5390-3200 a B.P. ）. The late Holocene was dry on the whole, rather humid with dry trend in the early period （3200 - 1950 a B. P. ） and then very arid in the late period. There was a wet event at about 1500 a B.P. during the late Holocene.

关 键 词：冰消期晚期 全新世 气候演化 碳酸盐含量 碳氧同位素 尕海湖 

分 类 号：P597[天文地球—地球化学] P53[天文地球—地质学]