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国土资源遥感  2019, Vol. 31 Issue (2): 231-239    DOI: 10.6046/gtzyyg.2019.02.32
  技术应用 本期目录 | 过刊浏览 | 高级检索 |
相山铀矿田西部深钻岩心成像光谱编录及蚀变分带特征
张川1,2,叶发旺1,徐清俊2,邱骏挺1
1.核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京 100029
2.中国地质大学(北京)地球科学与资源学院,北京 100083
Deep drill logging and its alteration zoning features based on hyperspectral core imaging in west of Xiangshan uranium orefield
Chuan ZHANG1,2,Fawang YE1,Qingjun XU2,Junting QIU1
1.National Key Laboratory of Remote Sensing Information and Imagery Analyzing Technology, Beijing Research Institute of Uranium Geology, Beijing 100029, China
2.Faculty of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
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摘要 

相山盆地西部是目前相山铀矿田攻深找盲的重要潜力区域,其深部具体的蚀变分带仍有待进一步的研究。成像光谱岩心扫描技术为揭示深部蚀变信息提供了一种新的手段。通过对相山西部牛头山地区的科学深钻进行岩心成像光谱扫描和数据处理,完成了5类蚀变矿物的岩心填图,采用像元分类统计算法获得了整个钻孔的蚀变矿物相对含量编录曲线。通过与地质岩性编录和物探测井曲线的对比,印证了岩心成像光谱编录蚀变信息的可靠性。根据深钻岩心成像光谱编录结果,基底以上可划分为3个蚀变带: 上——绿泥石化为主,中——高岭石+地开石化和伊利石(主要是短波伊利石)化为主,下——伊利石(长波伊利石多、短波伊利石少)化为主。钻孔上、下2段铀矿化具有明显不同的蚀变矿物组合特征,反映不同波长伊利石的形成环境具有相对差异性。短波伊利石形成于相对偏酸性的流体环境,与酸性蚀变主导的铀成矿密切相关,长波伊利石形成于相对偏碱性的流体环境,与铀成矿的相关性不高。深钻蚀变分带特征反映了偏酸性的流体活动晚于偏碱性的流体活动,并作用于后者之上,铀伴随着后期的钾交代和偏酸性的流体活动逐渐富集; 深部碱交代作用的演化具有钠交代→钾交代→酸交代的总体演化规律。

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张川
叶发旺
徐清俊
邱骏挺
关键词 相山深钻岩心成像光谱蚀变矿物铀矿化    
Abstract

The west of Xiangshan basin is an important potential area in the search for deep-buried uranium ore deposits in Xiangshan uranium orefield, and its deep alteration zoning remains to be further explored. Imaging hyperspectral core scanning technique provides a new means for revealing deep alteration information. On the basis of the imaging hyperspectral scanning data of deep drilling cores in the Niutoushan area of western Xiangshan, mapping of 5 types of altered minerals was realized by data processing. Then, pixels statistic algorithm was used to obtain the relative content logging curve of each altered mineral. The reliability of the imaging hyperspectral logging was verified by comparing the geological lithology and geophysical logging curves. According to the results of imaging hyperspectral logging of deep drill holes, the formations overlying the basement can be divided into three alteration zones. The main alteration of the first is chloritization, which is located in the upper part, and the second main alterations located in the middle part contain kaolinization, dickitization, and illitization dominated by shortwave illite, and the third main alteration is illitization that is characterized by more long wave and less short wave illite, located in the lower part. Uranium mineralizations in the upper and lower parts of the borehole have distinct features of altered mineral combinations and show that formation environments of illites with different wavelength characteristics are relatively different. The short wave illite tends to form in relatively acidic fluid environment, closely related to uranium mineralization controlled by acid alterations; the long wave illite tends to form in relatively alkaline fluid environment and is not closely related to uranium mineralization. Alteration zoning features of deep drill holes reveal that acidic fluid activity is later than alkaline fluid activity and acts on the latter. Uranium is gradually enriched with deuteric potassium metasomatism and acidic fluid activity. The action of deep fluid on the whole has the evolution characteristics of starting from sodium metasomatism to potassium metasomatism, followed by acid metasomatism with the time.

Key wordsXiangshan    deep drill    core    imaging hyperspectral    altered mineral    uranium mineralization
收稿日期: 2018-03-21      出版日期: 2019-05-23
ZTFLH:  TP79P627  
基金资助:中核集团重点专项“龙灿”创新示范工程项目“相山基础地质研究”(LCD116);中核集团龙腾二期项目“铀及多金属矿产勘查高光谱遥感综合应用示范”共同资助(遥LTY1604)
作者简介: 张 川(1985-),男,高级工程师,博士研究生,主要从事高光谱遥感信息提取、遥感地质方面的研究工作。Email: chuanzi521@163.com。
引用本文:   
张川,叶发旺,徐清俊,邱骏挺. 相山铀矿田西部深钻岩心成像光谱编录及蚀变分带特征[J]. 国土资源遥感, 2019, 31(2): 231-239.
Chuan ZHANG,Fawang YE,Qingjun XU,Junting QIU. Deep drill logging and its alteration zoning features based on hyperspectral core imaging in west of Xiangshan uranium orefield. Remote Sensing for Land & Resources, 2019, 31(2): 231-239.
链接本文:  
http://www.gtzyyg.com/CN/10.6046/gtzyyg.2019.02.32      或      http://www.gtzyyg.com/CN/Y2019/V31/I2/231
Fig.1  相山盆地地质简图[22]
技术参数 参数值
光谱范围/μm 1.02.5
空间像素数/个 320
横向视场角/(°) 14
瞬时视场角/mrad 0.75
光谱采样带宽/nm 6.25
通道数/个 256
数字化/bit 14
Tab.1  Hyspex SWIR-320 m-e技术参数
Fig.2  岩心成像光谱蚀变矿物填图技术流程
Fig.3  岩心蚀变矿物端元光谱曲线
蚀变矿物类型 主要光谱特征识别标志
高岭石 2 170 nm和2 205 nm附近双吸收、前浅后深
地开石 2 170 nm和2 205 nm附近双吸收、深度相近
短波伊利石 2 2002 210 nm单吸收、2 3452 355 nm单吸收
长波伊利石 2 2112 220 nm单吸收、2 3452 355 nm单吸收
绿泥石 2 3402 360 nm单吸收、2 265 nm附近单吸收
碳酸盐岩 2 3302 350 nm单吸收
Tab.2  岩心蚀变矿物诊断性光谱特征识别标志
Fig.4  矿化段岩心蚀变矿物填图
Fig.5  深钻岩心蚀变矿物相对含量编录与岩性、测井编录综合对比
Fig.6  岩心段照片
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