Porphyry Copper Deposit Prognosis in the Middle Part of the Bangong Co-Nujiang River Metallogenic Belt in Tibet Based on Alteration Information Extraction
基于蚀变信息提取的西藏班公湖-怒江成矿带中段斑岩铜矿找矿预测

In this paper, the Duobuza porphyry copper deposit in western Bangong Co-Nujiang River metallogenic belt of Tibet was selected as the typical deposit, and the spectral character of its field samples was analyzed. ASTER data were used as the remote sensing data source, and three methods of color enhancement, band ratio, and spectral angle mapping were chosen as the main methods for alteration information extraction and potential ore deposit prognosis in eastern Bangonghu-Nujiang metallogenic belt of Tibet. Finally, a promising ore deposit area was delineated. Through field survey of the predicted area, lots of malachite outcrops were found. An analysis of ICP-MS indicates that copper grade is between 0.18% and 1.95%, with the average grade being 0.51%. The result of induced electrical scanning of the predicted area is coincident with the result of remote sensing, suggesting that the predicted area is a prospective area of porphyry copper deposit.