尕海地区晚冰期以来沉积记录的气候环境演变  

CLIMATIC-ENVIRONMENTAL EVOLUTION IN GAHAI LAKE AREA SINCE THE LATE GLACIAL PERIOD FROM LOSS-ON-IGNITION

作　　者：陈忠[1] 马海州[1] 曹广超[1] 张西营[1] 周笃珺[1] 姚远[2] 高章洪[1] 谭红兵[1] 

机构地区：[1]中国科学院青海盐湖研究所,西宁810008 [2]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《海洋地质与第四纪地质》2007年第1期131-138,共8页Marine Geology & Quaternary Geology

基　　金：中国科学院知识创新重要方向性项目(KZCX2-SW-118)

摘　　要：通过对尕海沉积物烧失量和碳酸盐含量以及岩性变化分析,重建了尕海地区晚冰期以来的气候环境演变。结果显示:烧失量及碳酸盐含量指标可以较好地反映晚冰期以来的气候变化,晚冰期的阿勒罗德暖期和新仙女木事件有较好的反映。全新世则可划分为早全新世的不稳定期,年代为11150-8240 cal.aBP,中全新世较为暖湿期,年代为8240-3200 cal.aBP,晚全新世干冷期,年代为3200 cal.aBP至今。并发现1550-1440 cal.aBP存在一暖湿事件。Based on analyses of Loss-on-Ignition （LOI）, carbonate content and sediment characteristics, the authors reconstruct the climatic and environmental evolution of the Gahai Lake area since the Late Glacial period. The results cover the Aller6d period （between 12 710 and 12 380 cal. aBP）, the Younger Dryas period （between 12 380 and 11 360 cal. aBP）, and the Holocene. The Holocene can be divided into three periods： the early Holocene （11 360-8 240 cal. aBP）, which was dry but unstable and featured rising temperatures; the mid-Holocene （8 240-3 200 cal. aBP）, which was warm and wet in early period and cool and dry in late period; and the late Holocene （since 3 200 cal. aBP）, which was cold and dry in early period and relativele warm and dry in late period. Results also show a warm-wet event around 1 500 cal. aBP.

关 键 词：烧失量 碳酸盐含量 晚冰期 尕海 

分 类 号：P532[天文地球—古生物学与地层学]