川西高原黄土—古土壤序列环境磁学研究最新进展与展望  

Recent Research Advances in Loess—Paleosol Environmental Magnetism in Western Sichuan Plateau,China

作　　者：陈梓炫 杨军怀 王树源 吕镔[2] 杨胜利[1] 夏敦胜[1] CHEN Zixuan;YANG Junhuai;WANG Shuyuan;LYU Bin;YANG Shengli;XIA Dunsheng(Key Laboratory of Western China's Environmental Systems(Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province,Fujian Normal Unversity, Fuzhou 350007, China)

机构地区：[1]兰州大学资源环境学院,兰州730000 [2]福建师范大学地理科学学院,福州350007

出　　处：《山地学报》2021年第6期806-820,共15页Mountain Research

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0602)。

摘　　要：川西高原堆积的黄土—古土壤序列是青藏高原东部地区良好的古气候记录载体,记录了不同时间尺度的古环境变化,对揭示印度季风和高原季风的演化历史及其驱动机制,理解青藏高原隆升效应与周边大气环流之间的关系具有重要意义。相比黄土高原,川西高原黄土环境磁学研究相对薄弱,亟需厘清黄土的磁学性质、磁化率增强机制、成壤过程中磁性矿物的生成、转化机制及其与环境因子之间的响应关系,明确磁学参数的环境意义。本文全面评述了川西黄土环境磁学进展,回顾和总结川西高原黄土的磁性矿物的类型、浓度、粒径等磁学特征及其影响因素和磁学参数的古环境意义,并对存在的问题进行讨论,以期推动青藏高原东部黄土的环境磁学研究及其在古环境和古气候中的应用。The loess-paleosol sequence developed in Western Sichuan Plateau(WSP)in China provides a stratigraphically continuous paleoclimatic record of the Tibetan Plateau(TP).The paleoclimate study of WSP loess is of great importance to understand the evolution and driving mechanism of the Indian monsoon and the plateau monsoon,as well as the relationship between the uplift of TP and the surrounding atmospheric circulation.Compared with the study in the aeolian loess in Chinese Loess Plateau(CLP),little research was conducted on its magnetic properties,its enhancement mechanism of magnetic properties during pedogenesis,and the relationship between magnetic properties and environmental factors.In this study,updated achievements of the loess environmental magnetism in WSP were reviewed.Recent researches on the magnetic properties were summarized,including their type,concentration and grain size,and their influencing factors,together with their paleoenvironmental significance.The dust source determined the background values of magnetic properties,rather than the main factor determining spatial and temporal differences of magnetic properties.The magnetic properties in the WPS loess were significantly influenced by sedimentary environment.The loess in different geomorphic units could be affected by tectonic movements,water flow,wind erosion and other factors.However,the magnetic properties of the WSP loess with the stable sedimentary environment,was mainly controlled by pedogenesis and climatic factors.And they served as a record of the paleoclimate and paleoenvironment changes in TP.However,the magnetic properties of the WSP loess merely reflected the combined influence of single or multiple climatic factors due to the relatively wet pedogenic environment.Therefore,further work will need to explore the relationship between magnetic properties and climatic factors,which may provide an insight for paleoclimatic and paleoenvironment reconstruction in WSP.

关 键 词：青藏高原东部 川西高原 黄土 环境磁学 古环境意义 

分 类 号：P318[天文地球—固体地球物理学]