CAJ | 학술논문

南方不同红土的化学蚀变指数(CIA)，硅铝系数、铝铁系数硅铁铝系数反映红土的形成经历了脱钙、脱碱基和初级脱硅富铝富铁3个主要的风化阶段；稀土在前两个阶段中主要发生淋失，而在后一阶段中富集，其配分曲线具Eu亏损的轻稀土显著富集型特征。红土中稀土元素的赋存状态以晶格相为主，主要与基岩密切有关，而其它赋存状态则与红土化过程紧密相连。红土中可溶态稀土含量的高低是风化作用强度的有效指标。
남방불동홍토적화학식변지수(CIA)，규려계수 、려철계수 규철려계수 반영홍토적형성경력료탈개、탈감기화초급탈규부려부철3개주요적 풍화계단；희토재전량개계단중주요발생림실，이재후일계단중부집，기배분곡선구Eu우손적경희토현저부집형특정。홍토중희토원소적부존상태이정격상위주，주요여기암밀절유관，이기타부존상태칙여홍토화과정긴밀상련。홍토중가용태희토함량적고저시풍화작용강도적유효지표。
Chemical index of alteration (CIA) for different laterites released that lateritesderived from basalt, Quaternary red clay and gneiss hold the highest CIA values, followed by granite laterites, then limestone and sandstone; other parameters ratio exposed the results which agreed well with that of CIA; Normalized transitions for major element components were carried out to removethe false phenomena of enrichment or loss of inert components from which threestages for laterization process can be inferred, that is, leaching stage of CaO followed by leaching of and primary desilicification with Al-enrichment, then the stage of desilicification and Fe and Al-enrichment. Total REE contents in laterites were much higher than that in their basal rocks, andgneiss, limestone and granite laterites possessed the highest contents of total REE butlowest in sediments rich in quartz, t tests show no obviously REE content vahanceindifferent laterite horizons; Soluble REE richened apparently in the lower horizons inlaterite profiles, varied a lot with their derived basal rocks and extremely obviouslyexponential relation can be observed between total REE and soluble REE also extremelyobviously positive relations can exist for soluble REE with CIA values and claycontents while extremely obviously negative relations with organic matter, pH values and milos, which means soluble REE contents can be an effective indicator for laterization strength. Total REE contents showed extremely apparent negative relations with ratios and positive with ratio which reflected the reliance on parent rocks. After being normalized transition, laterite REE can be seenleached in the early laterization stage while enriched in the later stage. The mainchemical forms of REE in laterites were mainly crystal phases which inherited fromparent rocks, while other forms mainly related closely with laterization process.