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引用本文:李明慧,郑绵平.西藏扎布耶盐湖晚更新世沉积学及古气候意义.湖泊科学,2005,17(1):24-27. DOI:10.18307/2005.0104
LI Minghui,ZHENG Mianping.Late Pleistocene Sedimentation and Palaeoclimate in Zabuye Saline Lake, Northwestern Tibetan Plateau. J. Lake Sci.2005,17(1):24-27. DOI:10.18307/2005.0104
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西藏扎布耶盐湖晚更新世沉积学及古气候意义
李明慧1,2, 郑绵平1,2
1.中国地质科学院矿产资源研究所, 北京100037;2.中国地质科学院盐湖与热水资源研究发展中心, 北京l00037
摘要:
从粘土矿物、碳酸盐矿物、孢粉、介形虫等方面,讨论了西藏扎布耶盐湖晚更新世的气候条件.603±2.7kaB.P.、142.2±7.4kaB.P.时期,扎布耶为间或有一定盐度的淡水湖,前期湖水含盐量比后期高.气候寒冷,风化作用不强,物理风化作用为主.高岭石(60.3±2.7kaB.P.)和厌热性介形虫Radix.Bowelli(142.2±7.4kaB.P.)的出现说明,142.2±7.4kaB.P.时期气候偏干冷,气温比现在低;60.3±2.7kaB.P.气候偏湿冷.比较方解石中Mg含量可知,60.3±2.7kaB.P.比142.2±7.4kaB.P.的湖水盐度高.
关键词:  晚更新世  阶地  矿物  扎布耶盐湖  介形虫  古气候
DOI:10.18307/2005.0104
分类号:
基金项目:国家自然科学基金重点项目(49833010)和国家地质调查项目(200313000065)联合资助.
Late Pleistocene Sedimentation and Palaeoclimate in Zabuye Saline Lake, Northwestern Tibetan Plateau
LI Minghui1,2, ZHENG Mianping1,2
1.Institute of Mineral Resources, Chinese Academy of Geological ScienceCAGS, Beijing 100037, P. R. China;2.Research & Development Center of Saline Lake and Epithermal Deposites, CAGS, Beijing 100037, P. R. China
Abstract:
On the basis of clay, carbonate, pollen and ostracode, it presented the Late Pleistocene climate and environment of Zabuye saline lake in Northwestern Tibetan Plateau.In 60.3 ±2.7kaB.P.and 142.2 ±7.4kaB.P., it was a freshwater lake.Weathering was weak and physical weathering dominated.In 60.3 ±2.7kaB.P., the climate was cold and a little wet,as shown by the appearance of kalinite, and the salinity of water was higher than that of 142.2 ±7.4kaB, P.On the contrary, the climate was cold and a little dry in 142.2 ±7.4kaB.P., and there were many whole shells of ostracodes which implies the water was relatively ralni at that time.Iti addition,the Mg contents of caicite showed that the salinity of palaeo-Lake Zahuye during60.3±2.7kaB.P.was higher than in 142,2±7.4kaB, P.
Key words:  Late Pleistoceneterrace  mineralsLake Zabuye  ostracode  palaeoclimate
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