STUDY ON Au BIOGEOCHEMICAL EFFECTS USING REMOTE SENSING TECHNIQUE IN WESTERN GUANGDONG AND HAINAN PROVINCE, CHINA

摘要

It is found that the Vegetations have been poisoned by Au in the Au deposits of Guangdong and Hainan province, China. This can be evidenced by the following facts: Au contents in leaves are 10-2000 times higher than its vegetable abundence, chlorophyll is 10-30percent lower than that of vegetation grown in metamorphic rock, and 10-20percent higher than that in granite; carotenoid is 10-44percent lower than the background value; moisture of leaves is 10-20percent lower than the normal value; the temperature of leaves surface is 2-3 deg C lower than that of the normal leaves; the cell of leaves are abnormal and broken; the leaf color becomes into yellow or dark green. As a result, there are some abnormalism in spectral reflection feature. For example, the spectral reflectance of leaves surface is 5-30percent higher than the background value and the spectral wave shape moves toward to short weve by 5-15nm. The image gray level of Landsat TM and Airborn Imaging Scanner (AIS) is 10-100percent higher than background value. The color of gold deposit is quite different from background color in TM and AIS false color image. Using the results discribed above, the gold resource information system and detecting experts system have been set up and two gold deposits and two gold minerlization zones are found quickly, economicly and accurately in area covered with vegetation in Western Guangdong and Hainan province, China.