应环境变化与地表过程重点实验室朱立平研究员和王君波副研究员的邀请，德国耶拿大学Dr. Gerhard Daut 和不莱梅大学Prof. Volkhard Spiess等专家来所进行学术交流。
报告题目：Are the sediments of Lake Nam Co justifying any effort for an ICDP drilling project?
报告人：Dr. Gerhard Daut（德国耶拿大学地理系）
Prof. Volkhard Spiess （德国不莱梅大学海洋环境研究中心）
主持人：朱立平 研究员
地 点：中国科学院青藏高原研究所办公楼915会议室
时 间：2014年7月8日（星期二）16：00-18：00
简 介：
In 2005, a joint field campaign within the Sino-German cooperation started with first shallow seismic investigations and core recoveries. Further campaigns in 2006 and 2008 extended the existing shallow seismic profiles and led to the recovery of a core covering the past 24000 years. Numerous joint publications showed that the sediments of Nam Co allow high-resolution reconstructions of the paleoclimate and environment. But the big question was: How far back in time can we get? Therefore ITPCAS, University of Bremen and University of Jena made joint efforts to carry out a deep seismic survey of Lake Nam Co. Some preliminary observation are presented here:
-The total sediment thickness may exceed several hundred meters, but confirmation of this will require more data processing.
-Comparing the Holocene, fine-grained sequence of low reflectivity with deeper seismic facies, two more units of the same signature could be observed, probably indicating quiet sedimentation conditions with sediment sources far away from the basin center, thus indicating high lake level.
-These two units have been tentatively assigned to MIS 3 and 5, the latter dating back to 125 ka in a depth of 300-350 ms TWT (two way traveltime), or appx. 150-180 m below lake floor.
-Seismic images reveal deeper, flat lying reflectors, which may well represents older, late Quaternary sediments. In the ideal case, more than 750 ms TWT of sediment may exist in the central basin, as a bedrock reflection could not yet be identified.
欢迎各位老师和同学参加！
