青藏高原昆仑山垭口盆地晚上新世以来沉积物磁化率与气候变化  

Magnetic susceptibilitsy of lacustrine sediments and climatic change in Kunlun Mountains pass basin since the late Pliocene

作　　者：张振[1] 宋春晖[1] 张平[1] 夏维民[1] 邢强[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室&资源环境学院,甘肃兰州730000

出　　处：《资源调查与环境》2007年第3期205-213,共9页Resources Survey & Environment

基　　金：国家重点基础研究发展计划(2005CB422000);国家自然科学基金项目(90211013;40421101;40334038)资助

摘　　要：通过对青藏高原昆仑山垭口盆地磁化率、频率磁化率环境代用指标的分析,并与黄土-古土壤和深海δ18O记录的气候变化进行对比,结合剖面的岩性特征和年代序列以及前人所获得的粒度和孢粉资料,揭示了3.6～0.5 Ma期间昆仑山垭口盆地气候变化经历了六个阶段：3.6～2.48 Ma气候相对冷干、2.48～2.14 Ma气候偏凉湿、2.14～2.07 Ma气候相对冷干、2.07～1.16 Ma气候总体相对较湿润（其间有数次冷干波动）、1.16～0.78 Ma气候偏冷干以及0.78～0.5 Ma气候向冷湿发展.On the basis of research of the environmental proxy indexes of the magnetic susceptibility and magnetic frequency dependent susceptibility in Kunlun Mountains Pass Basin of the Tibet plateau and comparing with the climatic change record from loess-paleosoil sequence and deep sea δ^18O, the historical environmental variations have been studied with the analysis of the rocky characteristic, age sequence and the data of former granularity and sporopollen. It is implicated that the climate change of Kunlun Mountains Pass Basin can be divided into six periods ： 1 ） cold-dry in 3.6 - 2.48 Ma; 2） relative cool-humid in 2.48 - 2.14 Ma; 3 ） cold-dry in 2.14 - 2.07 Ma ; 4） warm-humid in general （several cool-dry oscillations in this period） in 2.07 - 1.16 Ma; 5）chang from warm-dry to cold-humid in 1.16 - 0.78 Ma; 6） warm-humid to cold in 0.78 - 0.5 Ma.

关 键 词：昆仑山垭口盆地 磁化率 气候变化 晚上新世 

分 类 号：P318[天文地球—固体地球物理学]