Applications Study Of SWIR Mineral Mapping

Mineral Mapping is a technique based on Hyperspectral Remote Sensing, and now is practicality on the Short Wavelength Infrared. Hyperspectral Mineral Mapping is a new concept, and it is used to characterize one or some hydrothermal minerals and their relative content on the ground. The essential unit of mapping is a single mineral. Although there some successful experiments on mineral mapping using the short-wave infrared (SWIR) reflectance spectroscopy in Canada, Australia and America, there is no work in China before the Development Center of China Geological Survey introduce the Portable Infrared Mineral Analyser (PIMA) into from the Integrated Spectronics Pry Ltd of Australia. The study areas of the dissertation are three copper prespects: Tuwu in Xinjiang, Qulong in Tibet and Pulang in Yunnan, China. These are the important and model deposits of the Geological Survey Project, therefor, the "Applications Study of SWIR Mineral Mapping At the Tuwu, Qulong and Pulang Copper Prospects, China" was selected as the title of dissertation. After 3 years work, the results as follow:1. From a new concept "indication mineral", that is mean recognized by the SWIR reflectance spectroscopy, and it can indicate the Cu mineralization and Cu ore body. Based the distributing of all minerals from a lot of mineral map, and compare other geological information such geological maps, the "Mineral Assembled" are obtain on the trench and drills.1) Tuwu copper prospect:(1) Indication minerals in Trench: muscovite, Fe-Mg chlorite, halloysite, montmorillonite, illite, kaolinite, anhydrite, Mg-clorite; Mineral Assembled: a. kaoiinite+halloysite+muscovite;b. Fe-Mg chlorite+halloysite+ muscovite; c. montmorillonite+ Fe-Mg chlorite+halloysite+ muscovite; d. montmorillonite+ Mg chlorite+illite; e. Mg chlorite+illite+Fe-Mg chlorite;(2) Indication minerals in Drills: illite, Mg-clorite, Fe-Mg chlorite, muscovite, montmorillonite, Fe-chlorite, halloysite, anhydrite, phengite, calcite;Mineral Assembled: a. Fe-Mg chlorite+hailoysite+ muscovite;b. Mg chlorite+illite+Fe-Mg chlorite+ halloysite; c. montmoriUonite+ Mg chlorite+illite+ halloysite; d. Mg chlorite+illite+Fe-Mg chlorite; e. Mg chlorite+illite+Fe-Mg chlorite+muscovite;2) Pulang copper prospect:(1) Indication minerals in Trench: anhydrite, illite, Mg chlorite, halloysite, Fe-Mg chlorite, Fe-chlorite, hornblende; Mineral Assembled: a. illite+gypsum+ Mg chlorite; b. illite+ halloysite+ montmorillonite;c. anhydrite+ Mg chlorite+Fe-Mg chlorite;(2) Indication minerals in Drills: illite, Mg-clorite, halloysite, anhydrite, montmorillonite, biotite, hornblende, Fe-Mg chlorite;Mineral Assembled: a. illite+ anhydrite +halloysite+biotite; b. illite+Mg chlorite+ montmorillonite +homblend;c. hornblend+ montmorillonite +illite+ halloysite; d. Mg chlorite+biotie+anhydrite+homblende; e. Mg chlorite+illite+ montmorillonite + halloysite;2. study the relation of mineral distributing and mineralization, and obtain some new point view of the copper this kinds deposit: (1) chlorite in turn as Fe-chlorite, Fe-Mg chlorite to Mg chlorite from the inside to the outside of ore body;(2) from the inside to outside in turn: phengite, muscovite, illite;(3) Anhydrite is the first indicate mineral, and relative to the Cu content of rocks.(4) muscovite, Fe-chlorite and halloysite and illite are the indicate minerals near the Cu ore body.3. sum up the working way of using SEIR on mineral mapping , including sample collecting, sample testing, date processing and explain, etc.