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
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.
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2019, Vol. 31 
