沉积与特提斯地质2025，Vol.45Issue(2)：329-340,12.DOI:10.19826/j.cnki.1009-3850.2024.10004
滇南金平中岭岗花岗岩风化壳型铌矿床特征及找矿潜力
Characteristics and prospecting potential of the granitoid weathering crust-type Zhonglinggang niobium deposit,Jinping County of Yunnan Province
摘要
Abstract
Niobium is one of the most important strategic scarce mineral resources in our country.In recent years,the Yunnan Institute of Geological Survey has discovered alkaline granitoid weathering crust-type niobium orebodies during mineral exploration,which is expected to lead to a breakthrough in niobium ore exploration in the future.In this paper,systematic geochemical studies have been conducted on granitic bodies,and detailed field geological exploration and indoor microscopic studies have been carried out to investigate the characteristics of orebodies and ore mineral compositions.The results show that the SiO2 contents of these granitoids average 72.95%;the Na2O+K2O values range from 8.82%to 10.13%,averaging 9.45%;the Na2O/K2O ratios are between 0.69 and 0.91,averaging 0.82,with the contents of Nb ranging from 112×10-6 to 170×10-6,Ta from 5.27×10-6 to 9.27×10-6,and Nb/Ta ratios ranging from 14.99 to 22.39.The granitoids are enriched in high field strength elements(HFSEs)such as Nb,Ta,and Th,as well as large ion lithophile elements(LILEs)like Rb,while depleted in Ba,Sr,and Ti.The formation of niobium ore is primarily attributed to the fractional crystallization of alkaline granitoid magma and following weathering.While the gneissic granitoid weathering crust-type niobium deposit was formed after the weathering of niobium-rich granitoids.The niobium-bearing pyrochlore is an important component for the formation of high-grade niobium orebodies.Based on regional mineral resource survey and comparative studies,this paper proposes that there is still great prospecting potential for revealing niobium polymetallic orebodies in the area from Maandi to Dazhai towns in Jinping County.关键词
铌矿/花岗岩风化壳/矿床地球化学/找矿潜力/金平县Key words
niobium deposit/granitoid weathering crust/ore deposit geochemistry/prospecting potential/Jinping County分类
天文与地球科学引用本文复制引用
伍建兢,孙聪伍..滇南金平中岭岗花岗岩风化壳型铌矿床特征及找矿潜力[J].沉积与特提斯地质,2025,45(2):329-340,12.基金项目
云南省国土资源厅项目(K2015056) （K2015056）
