岩矿测试2025，Vol.44Issue(1)：102-114,13.DOI:10.15898/j.ykcs.202401090001
内蒙古中部碱长花岗岩型铌钽矿床典型岩矿光谱识别特征
Spectral Identification Characteristics of Typical Rocks and Minerals in Alkali Feldspar Granite Type Nb-Ta Deposits in Central Inner Mongolia
摘要
Abstract
Located in the central region of Inner Mongolia,within the southern segment of the Daxing'anling-North China Craton metallogenic belt,the area is notable for its widespread distribution of alkaline granite-type niobium-tantalum(Nb-Ta)deposits.Despite the region's rich Nb-Ta resources,a comprehensive understanding of its spectroscopic characteristics remains inadequate,hindering precise and efficient mineral exploration.This study focuses on the Zhaojinggou large Nb-Ta deposit,employing portable short-wave infrared and thermal infrared spectrometers to analyze typical rock and mineral samples.The research reveals distinctive spectroscopic features of Nb-Ta enriched albite granite,amazonitization albite granite,amazonite pegmatite,biotite monzogranite,and wolframite-quartz vein.Comparative analysis,particularly against the standard sodium granite spectrum from the USGS spectral library,identifies a specific weak absorption feature at 2360nm,crucial for distinguishing amazonitization albite granite from other rocks and minerals,likely attributed to rock alteration and mineralization processes.In thermal infrared spectroscopy,quartz veins containing wolframite are distinguished by their high reflectance and"three-peak"features.Despite their similar spectral shapes,Nb-Ta enriched albite granite,amazonite pegmatite,and biotite monzogranite can be distinguished by the absorption depth and the ratio of absorption peak intensity around 2200nm.These findings provide a foundational dataset for future remote sensing surveys and evaluations of Nb-Ta mineral resources.The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202401090001.关键词
铌钽矿/光谱特征参数/近红外光谱/热红外光谱Key words
Nb-Ta deposits/spectral characteristic parameters/near-infrared spectroscopy/thermal infrared spectroscopy分类
地质学引用本文复制引用
汪翡翠,汪大明,栗旭升,张博,魏佳林,曹思琦,仝云霄..内蒙古中部碱长花岗岩型铌钽矿床典型岩矿光谱识别特征[J].岩矿测试,2025,44(1):102-114,13.基金项目
国家重点研发计划项目(2022YFB3902000) （2022YFB3902000）
中国地质调查局地质调查项目"华北陆块北缘成矿带战略性矿产调查"(DD20240058),"华北陆块北缘关键地区航空高光谱遥感调查"(DD20243407),"华北地块北缘铜铌钽锂多金属矿战略性矿产调查评价"(DD20230327) （DD20240058）
