祁连山及周边地区沉积物磁化率指示意义  

Magnetic susceptibility indicators of sediments in the QilianMountains and the surrounding areas

作　　者：张占森 李育[1] 高铭君 周雪如 李海烨 段俊杰 薛雅欣 ZHANG Zhan-sen;LI Yu;GAO Min-jun;ZHOU Xue-ru;LI Hai-ye;DUAN Jun-jie;XUE Ya-xin(College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2023年第4期489-499,共11页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(42077415);第二次青藏高原综合科学考察研究项目(2019QZKK0202);中国科学院战略性先导科技专项项目(XDA20100102);科技部西部环境变化学科创新引智基地2.0项目(BP0618001)。

摘　　要：在祁连山及周边地区采集表层沉积物样品444份,分析表层沉积物磁化率的空间分布特征,结合祁连山及周边地区地层沉积物磁化率的研究成果,探讨沉积物磁化率的指示意义.结果表明,表层沉积物磁化率与经度相关性较高,以97°~98°E为界,东侧磁化率主要受控于亚洲季风;西侧受控于西风环流,磁化率受风力或者风沙输送影响,与物源有关.地层沉积物磁化率在不同环流系统中意义存在差异,亚洲夏季风控制区沉积物磁化率与气候湿润程度呈正相关,西风模态核心区反之,过渡区沉积物磁化率对气候的响应更加复杂.444 surface sediment samples were collected in the Qilian Mountains and the surrounding areas,and the spatial distribution characteristics of the surface sediment magnetic susceptibility were analyzed.Combined with the research results on the formation sediment magnetic susceptibility in the Qilian Mountains and surrounding areas,the indicative significance of the sediment magnetic susceptibility was discussed.The results showed that the magnetic susceptibility of surface sediments was highly correlated with the longitude,with 97-98°E as the boundary,the susceptibility on the east side was mainly controlled by the Asian monsoon,the west side controlled by the westerly circulation,and the magnetic susceptibility was transported by wind or sand impact,and was related to the provenance.The significance of the susceptibility of stratigraphic sediments in different circulation systems was different.The magnetic susceptibility of sediments in the Asian summer monsoon control area was positively correlated with the degree of climate humidity,while the core area of the westerly mode was on the contrary.The response of the sediment magnetic susceptibility to the climate in the transition area was more complex.

关 键 词：祁连山 沉积物 磁化率 环境变化 

分 类 号：P92[天文地球—自然地理学]