文章摘要
陈小平.老挝MK离子吸附型稀土矿床成矿及其矿化分布特征[J].地质与勘探,2022,58(6):1341-1352
老挝MK离子吸附型稀土矿床成矿及其矿化分布特征
Metallogenesis?and?mineralization?distribution?of?the?MK?ion-adsorbed?rare?earth?deposit?in?Laos
投稿时间:2022-01-17  修订日期:2022-08-16
DOI:
中文关键词: 离子吸附型稀土 重稀土 低中山地貌 风化壳 长山褶皱带 老挝
英文关键词: ion adsorption rare earth, heavy rare earth, mountain landform with low-medium height, weathered crust, Changshan fold belt, Laos
基金项目:
作者单位E-mail
陈小平 河南省航空物探遥感中心河南郑州 cxp841060@126.com 
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中文摘要:
      稀土是重要的战略性关键金属矿产资源,老挝是“一路一带”沿线的重要国家,境内寻找离子吸附性稀土矿找矿潜力巨大。老挝长山褶皱带呈NW-SE向分布,带内海西期黑云母二长花岗岩发育,以低中山地形地貌为主,近期在带内发现多处花岗岩风化壳有关的离子吸附型稀土矿床。文章通过分析该区花岗岩地球化学特征、风化壳剖面及钻孔样品,研究赋存于花岗岩风化壳的离子吸附型稀土矿床成矿地质特征,探讨其在低中山地区的成矿特征,推断低中山地形地貌与矿体分布的关系。研究表明,区内花岗岩风化壳结构分层特征明显,矿体分布受海拔标高及微地貌控制;稀土元素的分馏不仅在垂向上,在水平方向上也十分明显。通过厘定本区离子吸附型稀土矿床成矿特征,发现在低中山地貌区,高海拔第一阶梯矿化不好,且以轻稀土为主,而相对低的第二阶梯矿化较好,矿化强度高,稀土类型向中重稀土过渡的特征明显。
英文摘要:
      Rare earth is an important strategic key metal mineral resource. Laos is an important country along the “One Road and One Belt”, which possesses a great potential to discover ion-adsorption rare earth ores. The NW-SE-trending Changshan fold belt in Laos develops Hercynian biotite monzogranite, which is dominated by low and medium mountain landforms. Many ion adsorption type rare earth deposits related to granite weathering crust have been discovered in this fold belt. This work analyzed the geochemical characteristics of granite, weathering crust profile and borehole samples to discuss the metallogenic geological characteristics of ion adsorption type rare earth deposits hosted in granite weathering crust. The metallogenic characteristics of low and middle mountain areas were studied, and the relationship between the low and middle mountain landform and the orebody distribution was inferred. Results show that the layered characteristics of granite weathering crust are significant in the area, and the distribution of ore bodies is controlled by elevation and micro landform. The fractionation of rare earth elements can be observed in both vertical direction and horizontal direction. Through determining the metallogenic characteristics of ion adsorption type rare earth deposits in this area, it is inferred that in the low and middle mountain landform area, the first-step mineralization at high altitude is not good, and is dominated by light rare earth elements, while the relatively low second-step mineralization is good, with strong mineralization, and the transition of rare earth type to medium and heavy rare earth is obvious.
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