检索结果-南通市图书馆

A new method of searching for concealed au deposits by using the spectrum of arid desert plant species

Journal of Arid Land 2021年第11期13卷 1183-1198页

作者： CUI Shichao ZHOU Kefa ZHANG Guanbin DING Rufu WANG Jinlin CHENG Yinyi JIANG Guo State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Mineral Resources and Digital Geology Urumqi 830011China Xinjiang Research Centre for Mineral Resources Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Xinjiang Academy of Science and Technology for Development Urumqi 830011China China Non-Ferrous Metals Resources Geological Survey Beijing 100012China

With the increase of exploration depth,it is more and more difficult to find au *** to the limitation of time and cost,traditional geological exploration methods are becoming increasingly difficult to be effectively ***,new methods and ideas are urgently *** study assessed the feasibility and effectiveness of using hyperspectral technology to prospect for hidden au *** this purpose,48 plant(Seriphidium terrae-albae)and soil(aeolian gravel desert soil)samples were first collected along a sampling line that traverses an au mineralization alteration zone(Aketasi mining region in an arid region of China)and were used to obtain soil au contents by a chemical analysis method and the reflectance spectra of plants obtained with an Analytical Spectral Device(ASD)FieldSpec3 ***,the corresponding relationship between the soil au content anomaly and concealed au deposits was ***,the characteristic bands were selected from plant spectra using four different methods,namely,genetic algorithm(GA),stepwise regression analysis(STE),competitive adaptive reweighted sampling(CARS),and correlation coefficient method(CC),and were then input into the partial least squares(PLS)method to construct a model for estimating the soil au ***,the quantitative relationship between the soil au content and the 15 different plant transformation spectra was established using the PLS *** results were compared with those of a model based on the full *** results obtained in this study indicate that the location of concealed au deposits can be predicted based on soil geochemical anomaly information,and it is feasible and effective to use the full plant spectrum and PLS method to estimate the au content in the *** cross-validated coefficient of determination(R2)and the ratio of the performance to deviation(RPD)between the predicted value and the measured value reached the maximum of 0.8218 and 2.37,respect

关键词： concealed au deposits reflectance spectroscopy soil au content characteristic band soil geochemical prospecting competitive adaptive reweighted sampling Seriphidium terrae-albae

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