辽南地区红色风化壳发育空间差异对比研究  

Comparative study on spatial differences in the development of red weathering crust in the southern Liaoning region

作　　者：魏东岚[1] 李玮烨 WEI Donglan;LI Weiye(School of Geographical Sciences,Liaoning Normal University,Dalian 116029,China)

机构地区：[1]辽宁师范大学地理科学学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2024年第3期359-364,共6页Journal of Liaoning Normal University:Natural Science Edition

基　　金：辽宁省自然科学基金资助项目(LJKMZ20221430)。

摘　　要：石英颗粒表面形态特征广泛应用于重建古气候与古环境的演变特征.基于野外调查,选取辽南地区拉树房和七顶山红色风化壳剖面作为研究区,利用扫描电镜对石英颗粒表面化学特征进行观察,并引用化学作用度函数,在定性描述的基础上进行定量研究.进一步明确两地红色风化壳在同一发育时期的气候差异.结果表明:拉树房剖面和七顶山剖面均以高能化学环境为主,处于中等化学风化阶段,发育环境为温暖湿润的气候条件,其中,拉树房剖面红色风化壳发育期间气候波动较大,七顶山剖面较稳定.距基岩120 cm处、距基岩80 cm处、距基岩40 cm处的溶蚀及沉淀特征发育程度总体上呈递减趋势.分析化学作用度、环境颗粒百分比以及化学蚀变指数,三者的变化趋势呈现出很好的同步性,符合风化壳发育前锋理论.The surface morphology characteristics of quartz particles are widely used in the reconstruction of ancient climate and environment.This article is based on field investigations and focuses on sections of the red weathering crust in Lashufang and Qidingshan in the southern Liaoning region.The surface chemical characteristics of quartz particles are observed using scanning electron microscopy,and the chemical action function is cited to conduct quantitative research on the basis of qualitative description.Further clarify the climate differences between the two red weathering crusts during the same development period.The results show that both the Lashufang and Qidingshan profiles are dominated by high-energy chemical environments and are in the stage of moderate chemical weathering.The development environment is warm and humid climate conditions.Among them,the climate in the Lashufang profile fluctuates greatly during the development of the red weathering crust,while the Qidingshan profile is relatively stable.The development degree of dissolution and precipitation characteristics at a distance of 120,80,and 40 cm from the bedrock generally shows a decreasing trend.Analysis of chemical activity,environmental particle percentage,and chemical alteration index shows good synchronicity among the three,which is in line with the theory of weathering crust development.

关 键 词：红色风化壳 石英颗粒表面形态 扫描电镜 发育差异 

分 类 号：P512.1[天文地球—地质学]