Climatic change record of the sediments in Lake Biwa,Japan during the last 1 Ma

作     者：Takemura K Hayashida A Danhara T 

作者机构：Institute of Geothermal SciencesKyoto University 

出 版 物：《地球环境学报》 (Journal of Earth Environment)

年 卷 期：2011年第1期

页      面：324-324页

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

主　　题：Lake Climatic change record of the sediments in Lake Biwa,Japan during the last 1 Ma 

摘      要：Lake Biwa is the largest and oldest lake in *** drilled core in 1982-1983（1400 m core） has revealed900 m lake and terrestrial sediments overlying the basement *** age data obtained from fission-track dating and tephra correlation indicated the discontinuity of the sedimentary sequence in present Lake ***,the doubt on discontinuity of the sequence in present Lake Biwa was completely cleared by the reinvestigation of the fission-track ages and tephra identification of Danhara et al（2010）.Improvements on fission track timescale have successfully identified the paleomagnetic data from middle Matuyama reversed Epoch including the Jaramillo event,determining time coverage of the Lake Biwa sediment as-1.5 Ma.A highly linear sediment accumulation rate curve is thus given to the 900 m deep Lake Biwa *** secures the stable sedimentary environment of the basin,and the significance of Lake Biwa sediment as a good record for paleoclimate *** Biwa is,therefore,an ideal terrestrial site to explore paleoclimate and tectonic history during the past 1 Ma of East Asia.