| 周春风，冯志刚，吕俊文.石灰土剖面Th富集的地球化学研究[J].南华大学学报(自然科学版),2013,27(4):32~38.[ZHOU Chun-feng,FENG Zhi-gang,LV Jun-wen.Geochemical Research on Enrichment Behavior of Thorium in Limestone Soil Profiles[J].Journal of University of South China(Science and Technology),2013,27(4):32~38.] |
| 石灰土剖面Th富集的地球化学研究 |
| Geochemical Research on Enrichment Behavior of Thorium in Limestone Soil Profiles |
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| DOI： |
| 中文关键词: 钍 石灰土 富集 贵州 |
| 英文关键词:thorium limestone soil enrichment Guizhou Province |
| 基金项目:国家自然科学基金资助项目（41373115;40973070）;湖南省自然科学基金项目资助（06jj50074） |
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| 中文摘要: |
| 选择黔中岩溶地区的4条石灰土剖面作为研究对象，通过精细采样分析，讨论了石灰土形成过程中Th富集的地球化学特征及行为.结果表明：1）岩—土界面是Th发生显著富集的重要地球化学作用场所，主要表现为岩—土界面反应中伴随碳酸盐快速溶蚀导致体积巨大缩小变化后的残余富集.在此过程中，Th表现出明显的惰性.2）在石灰土剖面形成和演化过程中，Th的地球化学行为可能因剖面间存在的微环境差异而有所不同.对于发育浅薄的剖面，Th受铁氧/氢氧化物和粘土矿物的吸附而表现出惰性；对于发育相对深厚的剖面，Th表现出明显的活性，其行为不受铁氧/氢氧化物和粘土矿物的明显影响。 |
| 英文摘要: |
| Selecting four limestone soil profiles as the subject investigated from karst area of central Guizhou Province,and based on careful sampling and analysis,this work discusses geochemical characteristics and behavior of Th enrichment during the formation of limestone soils.The results show that: 1） the rock-soil interface is an important geochemical reaction place for significant enrichment of Th,and this mainly stems from residual enrichment of Th through huge changes in volume reduction of weathered residua accompanied by rapid dissolution of carbonates in the interaction of rock-soil interface.In this process,Th appears obviously inert.2）During the formation and evolution of limestone soil profiles,different geochemical behavior of Th exists between profiles possibly owing to micro-environmental diversities.For shallowly developed profiles,Th shows evident inertia by adsorption of iron oxide/hydroxide and clay minerals;for relatively profoundly developed profiles,Th exhibits some activity,and its behavior is not susceptible to iron oxide/hydroxide and clay minerals. |
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