WorldView- 3遥感数据在巴音戈壁盆地本巴图地区铀矿勘查中的应用
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本文为国防科工局“基于航空高光谱和伽马能谱的铀矿勘查技术研究”资助项目(编号:\[科工二司\]2021(88号))的成果


Application of WorldView- 3 remote sensing data to uranium exploration in Benbatu area, Bayingobi Basin
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    摘要:

    笔者等基于WorldView- 3(16波段)遥感数据,利用主成分分析方法提取了铁染、Al—OH、Mg—OH和碳酸盐异常信息。进一步查明巴音戈壁盆地本巴图地区蚀变类型及分布,为该地区铀矿勘查提供线索。经查证,提取的蚀变信息类型和位置较为准确,结合地质、地球化学等方法,可以很好地应用于盆山结合部位,甚至盆地内部,为寻找砂岩型铀矿发挥重要作用。综合地面能谱测量、地面光谱测量、岩石薄片观察和化学分析测试结果,认为研究区与铀矿化关系最为密切的蚀变为铁染和碳酸盐化,主要分布在北部巴音戈壁组下段、南部图克木隆起花岗质岩体和新尼乌苏凹陷东北边缘的巴音戈壁组上段。根据铁染和碳酸盐化信息在找矿目的层巴音戈壁组上段中的分布,结合该套地层地质特征,认为研究区NE向向斜西北翼,虽然相关蚀变信息发育,但地层褶皱变形且破坏严重而不利于砂岩型铀矿形成。NE向向斜转折端和东南翼蚀变相对偏弱,但地层稳定,且发育NW向断裂,有利于地下水和后期热液运移,是下一步铀矿勘查的有利地段。

    Abstract:

    There has been no substantial breakthrough in uranium prospecting in Bayingobi Basin for many years, it is necessary to use new techniques and methods to get new understandings, and provide clues for uranium exploration in this area. Methods: Based on WorldView- 3 (16 bands) remote sensing data, anomaly information of iron staining, Al—OH, Mg—OH and carbonate was extracted using principal components analysis, combined with field verification, ground gamma- ray spectrum measurement, thin sections observation and geochemistry analysis to further identify the alteration information types and distribution in Benbatu area of Bayingobi Basin. Resutls: The extracted iron staining, Al—OH, Mg—OH and carbonate information mainly distributes in the lower member of the Bayingobi Formation in the north of the study area, the granitic rock mass of Tukemu uplift in the south and the target stratum (the upper member of the Bayingobi Formation) at the edge of the depression. Comprehensive analysis indicates that iron staining and carbonate in the upper member of the Bayingobi Formation are most closely related to uranium mineralization. Furthermore, from the analysis of WV- 3 image, the target stratum was seriously deformed and damaged in the northwest wing of NE syncline in the study area, which is not conducive to the formation of sandstone- type uranium deposits. The hinge zone and southeast flank of the syncline are stable, which is favorable for groundwater and hydrothermal migration, and it is also beneficial to uranium mineralization. Conclusions: Based on the distribution of anomaly information extracted by the WV- 3, Combined with geology, geochemistry, and the analysis of WV- 3 images, it was considered that the hinge zone and southeast flank of the syncline in the northeast of Xinniwusu depression are favorable sections for uranium exploration in the next step. This study shows that the WV- 3 remote sensing data can be well applied to sedimentary rock areas, and play an important role in exploring sandstone- type uranium deposits.

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童勤龙,叶发旺,秦明宽,易敏,伍炜超.2022. WorldView- 3遥感数据在巴音戈壁盆地本巴图地区铀矿勘查中的应用[J].地质论评,68(4):2022082017,[DOI].
TONG Qinlong, YE Fawang, QIN Mingkuan, YI Min, WU Weichao.2022. Application of WorldView- 3 remote sensing data to uranium exploration in Benbatu area, Bayingobi Basin[J]. Geological Review,68(4):2022082017.

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  • 收稿日期:2022-01-10
  • 最后修改日期:2022-07-29
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  • 在线发布日期: 2022-08-20
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