1.辽宁师范大学 地理科学学院, 辽宁 大连 116029
2.青海大学 三江源生态系统教育部野外;科学研究观测站, 青海 西宁 810016
3.青海贵南荒漠生态系统国家定位观测研究站, 青海 西宁 810016
贾飞飞(1988—),女(汉族),山东省济宁市人,博士,副教授,主要从事风沙地貌和沙地演化等方面的研究。Email:jiafeifei@lnnu.edu.cn。
收稿:2025-04-21,
修回:2025-05-24,
纸质出版:2025-10-10
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贾飞飞, 沈雪艳, 魏露露, 等.常量化学元素记录的科尔沁沙地地表沉积物风化特征[J].水土保持通报,2025,45(5):25-34.
Jia Feifei, Shen Xueyan, Wei Lulu, et al. Weathering characteristics of surface sediments in Horqin sandy land revealed by major chemical elements [J]. Bulletin of Soil and Water Conservation,2025,45(5):25-34.
贾飞飞, 沈雪艳, 魏露露, 等.常量化学元素记录的科尔沁沙地地表沉积物风化特征[J].水土保持通报,2025,45(5):25-34. DOI: 10.13961/j.cnki.stbctb.2025.05.008. CSTR: 32312.14.stbctb. 2025.05.008..
Jia Feifei, Shen Xueyan, Wei Lulu, et al. Weathering characteristics of surface sediments in Horqin sandy land revealed by major chemical elements [J]. Bulletin of Soil and Water Conservation,2025,45(5):25-34. DOI: 10.13961/j.cnki.stbctb.2025.05.008. CSTR: 32312.14.stbctb. 2025.05.008..
目的
2
以科尔沁沙地地表物质化学元素记录为切入点,揭示沙地化学风化程度和空间特征,分析影响地表物质化学风化的主要因素,为进一步理解科尔沁沙地地表物质迁移过程以及沙地生态保护和修复工作提供科学依据。
方法
2
通过采集和分析118个科尔沁沙地地表沉积物样品,利用多种化学风化指数,如化学蚀变指数(CIA)、斜长石风化指数(WIP)、斜长石蚀变指数(PIA),以及成分变异指数(ICV)和地球化学分析三角图来评估科尔沁沙地地表空间风化特征,并探讨影响区域风化的因素。
结果
2
①科尔沁沙地整体处于化学风化的初等阶段,不同类型沙地化学风化程度差异不明显。西南部及中部地区的化学风化强度略高于其他地区,地表沉积物成熟度较低,以初次循环沉积物为主;沉积物风化以斜长石风化为主,处于脱Na,Ca阶段。 ②通过物源判别三角图解、函数二元图解分析,指示出化学元素特征与中酸性花岗岩相似,印证沉积物母岩主要来自中酸性花岗岩。物源区的岩石类型和矿物组成决定了风化作用的初始条件,进而影响了风化过程的进行。 ③气候条件是控制风化作用的重要因素,沙地西部化学风化强度与温度相关,沙地东部化学风化强度与降水相关。此外,沉积分异也会导致CIA值发生变化,进而影响化学风化强度。
结论
2
科尔沁沙地化学风化呈现“整体弱-局部异”的特征:物源属性(中酸性花岗岩)奠定风化基础,气候驱动空间差异,沉积分异过程进一步放大了风化强度差异。
Objective
2
Using the chemical element records of surface sediments in Horqin sandy land as an entry point, this study aims to reveal the degree and spatial characteristics of chemical weathering, analyze the main factors influencing the chemical weathering of surface materials, and provide a scientific basis for further understanding the migration processes of surface materials in Horqin sandy land, as well as for its ecological protection and restoration efforts.
Methods
2
118 surface sediment samples from Horqin sandy land, and were collected and analyzed multiple chemical weathering indices, including chemical alteration index(CIA), plagioclase weathering index(WIP), plagioclase index of alteration(PIA), Compositional varibability index (ICV), and geochemical triangular diagrams were utilized to assess the spatial weathering characteristics of the surface sediments in Horqin sandy land. Meanwhile factors influencing regional weathering were also investigated.
Results
2
① Horqin sandy land as a whole was in the initial stage of chemical weathering, with insignificant differences in weathering degree among different types of sandy land. The chemical weathering intensity in the southwestern and central regions was slightly higher than in other areas. while the surface sediments exhibited low maturity and were primarily composed of first-cycle sediments. Weathering was dominated by plagioclase weathering, in the stage of Na and Ca leaching. ② Provenance discriminant diagrams and binary functional diagrams indicated that the geochemical characteristics resembled those of intermediate-acid granites. This confirmed that the parental rocks of the sediments were mainly derived from intermediate-acid granites. The rock types and mineral composition of the source area determined the initial conditions for weathering, thereby influencing the weathering process. ③ Climatic conditions were a significant factor controlling weathering. Chemical weathering intensity in the western part of the sandy land correlated with temperature, while in the eastern part, it correlated with precipitation. Additionally, sedimentary differentiation also caused variations in CIA values, consequently affecting chemical weathering intensity.
Conclusion
2
Chemical weathering in Horqin sandy land exhibits an ‘overall weak but locally heterogeneous’ pattern: Provenance attributes (intermediate-acid granites) establish the weathering foundation, climate drives spatial differences, and sedimentary differentiation processes further exacerbate the variations in weathering intensity.
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